Drone and Robotics Design Glossary
Plain-English definitions of the terms engineers and product teams use to design, build and certify drones and robots, from airframes and motor control to edge AI, payloads, manufacturing and compliance.
A
Accelerometer
An accelerometer is a sensor that measures linear acceleration along one or more axes, including the constant pull of gravity. In a drone or robot, the flight controller uses the gravity vector from the accelerometer to estimate roll and pitch. Because it picks up motor and propeller vibration, its mounting and filtering strongly affect how accurate the attitude estimate is.
Active disturbance rejection control (ADRC)
Active disturbance rejection control (ADRC) is a control method that estimates unknown disturbances and model errors in real time, using an extended state observer, and cancels them out. Unlike a plain PID loop, it needs little knowledge of the exact plant model, which helps with gusts, payload changes and motor wear. ODMs such as Aerora use ADRC for flight and gimbal control on multirotor, fixed-wing and tilt-rotor platforms.
Additive manufacturing
Additive manufacturing is the process of building a part layer by layer from a digital model, using methods such as fused filament fabrication, selective laser sintering and multi jet fusion. Drone and robot teams use it for fast prototype airframes, brackets and ducts, and for low-volume flight parts where tooling would cost more than the run.
Aeroelastic flutter
Aeroelastic flutter is a self-excited vibration in which aerodynamic, elastic and inertial forces feed each other until a wing, tail or control surface oscillates with growing amplitude. It can destroy a structure within seconds. Designers of long, thin UAV wings and high-speed fixed-wing drones check flutter speed with analysis and ground vibration tests.
AES-256 encryption
AES-256 is the Advanced Encryption Standard used with a 256-bit key, a symmetric cipher published by NIST in FIPS 197. On drones it protects video, telemetry and command traffic on the radio link from interception or tampering. Aerora lists AES-256 as a feature of its D64TR data link and GS7 ground station.
Airframe
The airframe is the physical structure of a drone: the body, arms or wings, tail, landing gear and mounts, without the motors, electronics or payload. Its stiffness, weight and layout set the limits on flight time, payload and vibration. ODMs such as Aerora combine aerodynamics and CFD work with composite materials to keep airframes light and stiff. See drone technology.
American Security Drone Act (ASDA)
The American Security Drone Act of 2023 is Subtitle B of Title XVIII of the FY2024 NDAA (§§1821-1833). It extends limits on drones from covered foreign entities, such as Chinese manufacturers, to all federal agencies. Procurement bans applied at enactment in December 2023, and bans on operating those drones or buying them with federal funds began 22 December 2025. See NDAA and Blue UAS requirements.
Anti-jamming
Anti-jamming covers the radio and navigation techniques that keep a drone working when someone transmits interference on its frequencies. Common methods include frequency hopping, spread spectrum, adaptive antennas that null the interference source, and multi-constellation GNSS receivers. It matters most for defense, public safety and critical-infrastructure missions, where a lost link or lost position can end the flight.
ArduPilot
ArduPilot is an open-source autopilot software suite, released under the GPLv3 license, that runs multirotors, helicopters, fixed-wing aircraft, VTOLs, ground rovers, boats and submarines. It includes flight modes, an EKF state estimator, failsafes and mission planning. Many commercial drones build on ArduPilot, and the GPL license means changes to the firmware itself generally must be shared when the product is distributed.
AS9100
AS9100 is the aerospace and defense quality management standard. It builds on ISO 9001 and adds requirements for configuration management, product safety, counterfeit part prevention and first article inspection. Revision D is still current in September 2026, and the IAQG is moving the series to the IA9100 name. Defense primes often expect AS9100 from suppliers of flight-critical drone parts.
Aspect ratio
Aspect ratio is a wing’s span squared divided by its area, or roughly how long and narrow the wing is. High-aspect-ratio wings produce less induced drag, so long-endurance fixed-wing UAVs and gliders use them. The tradeoff is more bending load at the root, a larger footprint for transport and a greater risk of flutter.
Attitude
Attitude is the orientation of a vehicle in space, usually expressed as roll, pitch and yaw angles or as a quaternion. Controlling attitude is the innermost job of a drone’s flight controller: a multirotor tilts to move, so position and velocity control both depend on a fast, accurate attitude loop. Errors in attitude estimation show up directly as drift or oscillation.
Attitude and heading reference system (AHRS)
An attitude and heading reference system (AHRS) is a unit that combines gyroscope, accelerometer and magnetometer data to output roll, pitch and heading. It adds onboard processing to a raw IMU, so the host receives a finished orientation estimate. Drones, robots and gimbals use an AHRS when they need stable orientation but not full position and velocity, which is what an INS adds.
Automated optical inspection (AOI)
Automated optical inspection uses cameras and image processing to check assembled circuit boards for missing, shifted or wrong parts and for solder defects such as bridges. It runs after paste printing or reflow on an SMT line. For flight controllers and ESCs, AOI catches most visible defects early, but hidden joints under BGA packages need X-ray inspection.
Automatic Dependent Surveillance-Broadcast (ADS-B)
ADS-B is a surveillance technology in which aircraft broadcast their GPS position, altitude and identity so controllers and other aircraft can track them. Many drones carry ADS-B In receivers to see nearby crewed traffic. Under 14 CFR 107.53, a Part 107 drone may not transmit ADS-B Out unless the FAA authorizes it, because thousands of drone transmitters could saturate the frequency.
Autopilot
An autopilot is the software, and sometimes the hardware, that flies a vehicle without continuous manual input, holding attitude, altitude, position and a route. In drones the term often means the full flight stack, such as PX4 or ArduPilot, running on a flight controller. Autopilot quality determines how stable, predictable and certifiable an aircraft’s automated behavior is.
B
Barometer
A barometer is a pressure sensor that a drone uses to estimate its altitude from changes in air pressure. It gives smooth relative altitude but drifts with weather and is disturbed by propeller wash and airflow, so designers shield it with foam or a vented enclosure. Flight controllers usually fuse it with GNSS, rangefinder or IMU data.
Battery eliminator circuit (BEC)
A battery eliminator circuit is a voltage regulator that powers low-voltage electronics from the main flight battery, so no separate battery is needed for them. It usually supplies 5 V or a similar rail to servos, receivers, flight controllers or cameras. Designers pick a switching BEC for efficiency and check its current rating against the peak load of everything on the rail.
Battery management system (BMS)
A battery management system is the electronics that monitors and protects a battery pack. It tracks cell voltages, pack current and temperature, balances cells, and cuts off or warns on overcharge, overdischarge, overcurrent and overheating. On commercial drones the BMS also reports state of charge and health to the flight controller, which can trigger a return to home. See our drone battery guide.
Beyond visual line of sight (BVLOS)
Beyond visual line of sight (BVLOS) means flying a drone farther than the remote pilot or a visual observer can see it. In the U.S., Part 107 requires visual line of sight, so BVLOS flights need a waiver or exemption. The FAA proposed Part 108 for routine BVLOS in August 2025; as of late September 2026 the final rule was still under White House review. See the FAQ.
Bill of materials (BOM)
A bill of materials is the structured list of every part, subassembly and raw material needed to build a product, with part numbers, quantities and approved manufacturers. For a drone, the BOM drives unit cost, lead time and compliance review, because each flight controller, radio, camera and battery cell has a country of origin that NDAA and FCC checks look at.
Blade element momentum theory (BEMT)
Blade element momentum theory is a propeller and rotor analysis method that splits each blade into small sections, calculates the lift and drag on each, and balances the result against momentum change in the airflow. It gives fast thrust, torque and efficiency estimates before CFD or testing. Aerora uses blade element and momentum theories to shape airfoils in its rotor designs.
Blue UAS Cleared List
The Blue UAS Cleared List is the Department of Defense (Department of War) list of complete drone platforms that passed cybersecurity and supply chain review for military purchase. The Defense Contract Management Agency (DCMA) took it over from the Defense Innovation Unit in December 2025. Listed items are exempt from the FCC Covered List until 1 January 2028. See NDAA and Blue UAS requirements.
Blue UAS Framework
The Blue UAS Framework is the companion to the Blue UAS Cleared List. It lists vetted components and software, such as flight controllers, radios, gimbals and ground control software, rather than whole aircraft. OEMs build with Framework parts to shorten their own review, but using them does not make a drone Blue UAS by itself. DCMA has managed it since the December 2025 transfer.
Board support package (BSP)
A board support package is the set of low-level software that makes an operating system run on a specific circuit board: bootloader, kernel configuration, device drivers and hardware setup files. Every custom drone or robot board needs one before application code can use its cameras, radios and sensors. ODMs such as Aerora do embedded Linux and Android BSP work for the boards they design.
Brushless DC motor (BLDC)
A brushless DC motor is an electric motor that switches current through its windings electronically instead of with brushes and a commutator. Almost every multirotor uses BLDC motors, usually outrunners with the magnets on a spinning bell around a fixed stator. With no brushes to wear, they are efficient and long-lived, but they need an electronic speed controller to run.
Buy American Act
The Buy American Act is a 1933 U.S. law that gives domestic end products preference in federal purchases. Under FAR 25.101, a manufactured item qualifies if it is made in the United States and domestic components exceed 65 percent of component cost for deliveries in 2024 through 2028, rising to 75 percent in 2029. Drones meeting this test are exempt from the FCC Covered List until 1 January 2028.
C
C-rating
A C-rating expresses how much current a battery can deliver as a multiple of its capacity. A 5,000 mAh pack rated at 20C can in theory supply 100 A continuously (5 A times 20). Makers’ C-ratings are often optimistic, so engineers size packs with margin and check voltage sag and cell temperature in real flight logs.
Carbon fiber composite
A carbon fiber composite is a material made of carbon fibers held in a polymer resin, usually epoxy. It offers high stiffness and strength for its weight, which is why it dominates drone arms, frames and wing spars. Designers set the fiber direction and layup to carry specific loads. Aerora lists composite materials among its airframe design strengths.
Cell configuration (S and P)
Cell configuration describes how many battery cells are wired in series (S) and in parallel (P). Series cells add voltage and parallel cells add capacity, so a 6S2P pack has two parallel strings of six cells. With LiPo cells at about 3.7 V nominal and 4.2 V full, a 6S pack sits near 22.2 V nominal, and motors and ESCs must be rated for the fully charged voltage.
Cellular drone connectivity
Cellular drone connectivity uses LTE or 5G networks to carry command, telemetry and video between a drone and its operator over the internet. Because coverage is not tied to the pilot’s radio range, it is attractive for beyond visual line of sight and fleet operations. Designers still need a backup link and failsafe behavior, since tower coverage at altitude can be uneven and networks are built for ground users.
Center of gravity (CG)
The center of gravity is the point where a vehicle’s weight can be treated as acting. On a multirotor, a CG far from the geometric center forces some motors to work harder, which cuts flight time and control margin. On a fixed-wing UAV, the CG must sit within a set range ahead of the neutral point for stable flight.
CNC machining
CNC machining is computer-controlled cutting of metal, plastic or composite stock into precise parts with mills, lathes and routers. Drone makers use it for aluminum motor mounts, gimbal brackets, hubs and cut carbon plates. It suits prototypes and small to mid-size runs because it needs no molds, though unit cost stays higher than molding.
Coaxial rotor
A coaxial rotor layout stacks two rotors on the same axis, spinning in opposite directions so their torques cancel. Drones such as X8 multirotors use coaxial pairs to fit more thrust into a small footprint. The lower rotor works in the upper rotor’s wake, so a coaxial pair produces less thrust than two separate rotors of the same size.
Cogging torque
Cogging torque is the uneven, notchy torque a permanent-magnet motor produces when unpowered, caused by magnets being attracted to the stator teeth. You feel it as detents when turning a motor by hand. It matters most at low speed, so gimbal motors and precision actuators use designs with low cogging to keep camera motion smooth.
Command and control link (C2)
The command and control link, or C2 link, is the radio connection that carries pilot or autopilot commands to the aircraft and status data back to the ground. Regulators treat it as safety-critical, separate from payload video. Designers specify its range, latency and lost-link behavior, and in the U.S. the FCC’s Part 88 rules open part of the 5030-5091 MHz band to UAS control links.
Companion computer
A companion computer is a second, more powerful processor that sits beside the flight controller and handles heavy tasks such as computer vision, AI inference, mapping and cloud links. It talks to the autopilot, typically over MAVLink or ROS 2, while the flight controller keeps real-time control. Aerora’s edge AI work with Lantronix uses Qualcomm-based Open-Q SOMs in this role.
Computational fluid dynamics (CFD)
Computational fluid dynamics is the use of numerical simulation to predict how air or water flows around and through a design. In drone work it estimates drag, lift, rotor interaction and cooling airflow before a prototype exists. Aerora refines its rotor designs with 2D cross-section analysis and 3D CFD simulation. See drone technology.
Conformal coating
Conformal coating is a thin protective film of acrylic, silicone, urethane, parylene or similar material applied over an assembled circuit board. It shields components from moisture, dust, salt fog and condensation. Drones that fly in rain, over the sea or through temperature swings often coat flight controllers and ESCs, while leaving connectors, test points and heat sinks masked.
Contract manufacturer (CM)
A contract manufacturer builds products to another company’s finished design, using the customer’s drawings, BOM and test procedures, and usually does little design work itself. Drone OEMs use CMs to scale without owning factories (compare UAV contract manufacturers). Aerora offers contract manufacturing in Vietnam. For any offshore-built drone, buyers should confirm its FCC authorization and exemption status.
Cost of goods sold (COGS)
Cost of goods sold is the direct cost of producing the units a company sells: components, assembly labor, factory overhead, freight and duties. For a drone program, COGS per unit sets gross margin and depends on BOM choices, manufacturing yield and order volume. Switching to NDAA-aligned motors, cameras and radios can raise COGS, which is why sourcing decisions belong early in design.
Country of origin
Country of origin is the country where a product was made or last substantially transformed, as defined for customs, labeling and trade rules. For drones it matters beyond tariffs: the FCC Covered List, NDAA Section 848 and the Buy American Act each look at where a product or its components were produced, and each uses its own test. Passing one test does not mean passing the others.
D
Data link
A data link is the radio system that moves information between a drone and its ground station, usually combining control, telemetry and payload video. Key specifications are throughput, range, latency, frequency band and encryption. Aerora’s D64TR data link, for example, is specified at up to 40 Mbps over 2.4 and 5 GHz, using OFDM/MIMO and AES-256 (see Aerora’s drone solutions).
Dead reckoning
Dead reckoning is estimating current position by starting from a known point and adding up measured speed, heading and elapsed time. Drones and ground robots fall back on it when GNSS is lost, using IMU, wheel odometry or airspeed data. Its weakness is that small errors accumulate, so position drifts over time unless an external fix corrects it.
Design for assembly (DFA)
Design for assembly is the practice of shaping a product so it is quick and error-proof to put together: fewer parts and fasteners, parts that fit only one way, and top-down assembly. In a drone, DFA might mean keyed arm connectors, snap-fit covers and one wire harness instead of loose leads, which cuts build time and assembly defects.
Design for manufacturing (DFM)
Design for manufacturing is the practice of designing parts so they can be produced reliably at the target cost and volume. It covers wall thickness and draft on molded shells, tolerances machines can hold, and PCB layouts that suit the assembly line. A DFM review before tooling is cheap, a change after the mold is cut is not. ODMs such as Aerora include DFM and tooling design in production planning.
Design for test (DFT)
Design for test is the practice of building testability into a product, especially its circuit boards: test points, boundary scan (JTAG), programming headers and built-in self-test firmware. Good DFT lets an in-circuit or functional tester find a bad motor driver or IMU in seconds on the production line, instead of after a failed flight in the field.
Design validation test (DVT)
Design validation test is the second of three hardware build stages, after EVT and before PVT. DVT units use production-intent parts and tooling and go through full qualification, including environmental, EMC, drop and endurance testing and regulatory pre-scans. For a drone, passing DVT means the design is frozen and ready for FCC and other certification testing.
Detect and avoid (DAA)
Detect and avoid (DAA) is the capability of an uncrewed aircraft to sense other air traffic and maneuver to stay well clear, standing in for a pilot’s “see and avoid” duty. It can use ADS-B receivers, radar, cameras or ground-based surveillance. ASTM F3442/F3442M sets architecture-agnostic performance requirements for DAA on smaller UAS, and DAA is central to routine BVLOS approval.
Disk loading
Disk loading is a rotor’s thrust divided by the area its blades sweep. Low disk loading, meaning large, slow rotors, needs less power to hover, which is why helicopters and long-endurance multirotors use big propellers. High disk loading allows a compact vehicle but costs hover efficiency and creates stronger downwash.
Downwash
Downwash is the downward-moving air pushed out by a rotor or wing as it produces lift. On multirotors, strong downwash stirs up dust and water, disturbs spray patterns on agricultural drones, and can affect sensors mounted under the rotors. Designers consider it when placing payloads, choosing propeller size and planning low-altitude work.
Drag coefficient
The drag coefficient is a dimensionless number that expresses how much aerodynamic drag a shape creates, independent of its size and speed. Drag equals the coefficient times dynamic pressure times a reference area. Lowering it through fairings, smooth payload housings or retracted landing gear directly raises the range and cruise speed of a drone.
Drone swarm
A drone swarm is a group of drones that coordinate their movements and tasks with a high degree of autonomy, often through distributed algorithms rather than one pilot per aircraft. Swarms are used for light shows, area search, mapping and defense. Design challenges include inter-drone communication, collision avoidance, shared situational awareness and graceful handling of individual failures.
DShot
DShot is a digital protocol that sends motor commands from a flight controller to an ESC as data frames instead of analog pulse widths. Each 16-bit frame carries an 11-bit throttle value, a telemetry request bit and a 4-bit checksum, at speeds such as DShot150, DShot300 and DShot600. It needs no calibration and rejects corrupted commands. Compare flight controllers that support it.
Dual sourcing
Dual sourcing means qualifying two independent suppliers for the same part so production continues if one fails, raises prices or becomes restricted. For drones it matters most for motors, cameras, radios and battery cells, where a single source in a covered country can block NDAA or FCC eligibility. Each second source needs its own qualification testing. See drone supply chain risks.
E
Edge AI
Edge AI means running artificial intelligence models on the device itself, such as a drone, robot or camera, instead of in the cloud. It cuts latency, saves link bandwidth and keeps working when the connection drops. Aerora and Lantronix announced an edge-AI visual navigation collaboration in June 2025. For chip options, see the edge AI chips guide.
Electro-optical/infrared (EO/IR)
EO/IR describes a payload that pairs a visible-light (electro-optical) camera with an infrared (thermal) camera, usually on one gimbal. Operators switch or blend the two views to find people, heat leaks or vehicles day and night. In one Aerora case study, the company integrated a Teledyne FLIR Hadron module (640×512 thermal plus 64 MP optical) on a 3-axis gimbal for an OEM (compare sensor integration partners).
Electromagnetic compatibility (EMC)
Electromagnetic compatibility is the ability of a device to work correctly in its electromagnetic environment without disturbing other equipment. EMC covers both emissions and immunity. In drones it means the radios, GNSS receiver, compass and cameras keep working next to high-current motor wiring, and that the product passes the compliance tests its target markets require.
Electromagnetic interference (EMI)
Electromagnetic interference is unwanted electrical noise, radiated or conducted, that disrupts another circuit. On drones, ESC switching and high-current battery leads are common sources, and victims include magnetometers, GNSS receivers and video links. Designers control EMI with board layout, filtering, shielding, twisted power leads and careful placement of sensitive parts away from power wiring.
Electronic speed controller (ESC)
An electronic speed controller turns a flight controller’s throttle command into the three-phase power that spins a brushless motor. It switches MOSFETs to energize the windings in sequence, usually estimating rotor position from back-EMF. ESCs come as single boards or 4-in-1 units, and many report RPM, current and temperature back to the flight controller.
Electronics manufacturing services (EMS)
Electronics manufacturing services companies assemble and test circuit boards and electronic products for other firms. Services usually include PCB assembly, cable harnesses, box build, test and repair. A drone OEM might use an EMS provider for flight controller and ESC boards while doing final aircraft integration itself. The term overlaps with contract manufacturer, but EMS is specific to electronics.
Embedded Linux
Embedded Linux is the Linux operating system tailored to run on a dedicated device rather than a general-purpose computer. Drones and robots use it on companion computers and camera or AI boards, often built with tools such as Yocto or Buildroot. It gives access to mature networking, camera and AI software, but it is not hard real-time, so flight-critical loops usually run elsewhere.
End-of-life component (EOL)
An end-of-life component is a part its manufacturer has announced it will stop making, usually with a last-time-buy date. Drones depend on processors, sensors and radio modules with short commercial lives, so an EOL notice can force a board redesign. Teams manage it with lifecycle monitoring, last-time buys and pin-compatible alternates chosen early. See drone supply chain partners.
Endurance
Endurance is the maximum time a drone can stay airborne on one battery charge or fuel load. It depends on battery energy, vehicle weight, aerodynamic efficiency and payload power draw. Specs usually quote hover endurance with no payload, so buyers should ask for endurance at their real payload weight. See drone batteries.
Energy density
Energy density is the energy a battery or fuel stores per unit of mass (gravimetric, in Wh/kg) or volume (volumetric, in Wh/L). For aircraft, gravimetric energy density at the pack level largely sets endurance, because every gram of battery must be lifted. Cell-level figures in datasheets are always higher than pack-level figures once wiring, BMS and enclosure are added.
Engineering validation test (EVT)
Engineering validation test is the first hardware build stage after prototypes, used to prove the design works as intended. EVT units may still use soft tooling and hand assembly. Engineers check function, power, thermal behavior and flight performance against the spec. Aerora offers EVT, DVT and PVT builds within the Validate phase of its ODM process for OEM programs.
Environmental testing
Environmental testing exposes a product to the conditions it will face in service, such as temperature extremes, humidity, vibration, shock, salt fog, sand, dust and water. Drone programs often follow MIL-STD-810 test methods, and IEC 60529 for IP ratings. Results show whether seals, connectors, batteries and electronics survive real missions. See drone services.
Export Administration Regulations (EAR)
The Export Administration Regulations are U.S. Commerce Department rules, run by the Bureau of Industry and Security (BIS), that control exports of dual-use and less sensitive military items. Most commercial drones and parts fall under the EAR, for example ECCN 9A012 or EAR99, not ITAR. A BIS final rule of 14 August 2026 eased several UAV controls, but UAVs with 300 km range stay missile-controlled.
Extended Kalman filter (EKF)
An extended Kalman filter (EKF) is a state estimation algorithm that fuses noisy sensor measurements with a motion model to estimate position, velocity and attitude. It extends the linear Kalman filter to nonlinear systems by linearizing around the current estimate. PX4’s EKF2 and ArduPilot’s EKF3 are the core estimators in those autopilots, and their tuning drives navigation accuracy.
F
FAA Part 107
FAA Part 107 is the U.S. rule for routine commercial flight of small drones under 55 pounds. Pilots need a Remote Pilot Certificate, and flights stay within visual line of sight, generally at or below 400 feet, unless the FAA grants a waiver. Part 108, the proposed rule for routine BVLOS operations, was still in final review in September 2026. See the drone FAQ.
Factor of safety
A factor of safety is the ratio between the load a structure can carry before it fails and the highest load it is expected to see in service. Crewed aircraft rules such as FAA 14 CFR 25.303 apply a factor of 1.5 to limit loads. Drone designers set their own factors for arms, mounts and landing gear, trading margin against weight.
Failsafe
A failsafe is a predefined automatic response to a fault, such as loss of the control link, low battery, GNSS loss or a geofence breach. Typical actions are hold position, return to home or land. Well-designed failsafes are configurable, tested in simulation and flight, and ordered by priority so that two faults at once do not produce conflicting commands.
FCC Covered List
The FCC Covered List names equipment judged an unacceptable national security risk. New models on it cannot get FCC equipment authorization, so they cannot be imported or marketed in the U.S. Foreign-made drones and critical components were added 22 December 2025, and mobile robots 28 July 2026. Earlier authorized models are unaffected. DA 26-761 exempts Blue UAS and Buy American items until 1 January 2028. See the drone FAQ.
FCC equipment authorization
FCC equipment authorization is the approval radio-frequency devices need before they are marketed in the U.S. Transmitters such as drone data links need Certification from a Telecommunication Certification Body and carry an FCC ID. Many digital-only devices use a Supplier’s Declaration of Conformity. Covered List products cannot get new authorizations, and conditionally approved foreign drones stay exempt only while their onshoring plans are kept.
Field-oriented control (FOC)
Field-oriented control is a motor control method that drives a brushless motor with smooth, sinusoidal currents aligned to the rotor’s measured or estimated position. Compared with trapezoidal control, it cuts torque ripple, noise and heat, which helps endurance and camera stability. Aerora designs sensorless FOC ESCs, which it describes as patent pending. See its drone technology page.
Figure of merit
Figure of merit is a measure of hovering rotor efficiency: the ideal induced power from momentum theory divided by the power the rotor actually uses. A perfect rotor would score 1, and real rotors score lower because of blade drag and tip losses. Engineers use it to compare propellers for multirotor hover performance.
Finite element analysis (FEA)
Finite element analysis is a simulation method that breaks a part into many small elements to predict stress, deflection, vibration modes and heat flow under load. Drone engineers use it to size arms, motor mounts and wing spars, find resonances near motor speeds, and remove weight without losing stiffness before cutting tooling.
Firmware
Firmware is the software stored on a device’s nonvolatile memory that directly controls its hardware. In a drone, the flight controller, ESCs, battery BMS, gimbal, radios and cameras each run their own firmware. Secure boot, signed updates and version control across all of these boards become important once a product ships in volume and needs field updates.
First article inspection (FAI)
First article inspection is a full, documented check of the first production part or assembly against every drawing dimension, material and requirement. It proves that the production process, not just one good prototype, makes conforming parts. Aerospace suppliers often use the AS9102 format. For drones, FAI is typical after new tooling, a new supplier or a design change.
Fixed-wing UAV
A fixed-wing UAV is an unmanned aircraft that gets lift from a wing moving through the air rather than from rotors. It covers far more distance per charge than a multirotor of the same weight, so it suits mapping, pipeline and farm surveys. It needs a runway, launcher or VTOL system to take off. See agriculture use cases.
Flight controller
A flight controller is the embedded board that reads sensors, runs the control loops and commands the motors or servos to keep a drone stable and on course. It typically carries an IMU, barometer and a microcontroller running autopilot firmware such as PX4 or ArduPilot. Compare common boards in the flight controller guide.
Folding arm
A folding arm is a multirotor arm that hinges or rotates against the body for transport and locks in place for flight. It shrinks the carry size of field and military drones. The hinge and latch add weight and must hold stiffness, because any play shows up as vibration and control error in flight.
Frequency band
A frequency band is a defined range of radio spectrum that a drone’s links are allowed to use. Many commercial drones use the unlicensed 2.4 GHz and 5.8 GHz bands, while GNSS receivers listen in L-band. The band sets range, penetration, interference risk and regulatory approval, so it affects antenna design, FCC equipment authorization and which markets a product can ship to.
Functional test
A functional test powers up an assembled board or product and checks that it does its job, such as booting firmware, reading sensors, spinning motors and linking to the radio. It usually runs after ICT or AOI near the end of the line. For drones, a functional test fixture often simulates flight inputs so each flight controller is checked before final assembly.
G
Geofencing
Geofencing is a virtual boundary, defined by coordinates and altitude limits, that the autopilot will not let a drone cross. When the aircraft reaches the fence, the system can stop, hold, return home or land. Operators use geofences to keep flights inside an approved area, and manufacturers use them to block known restricted airspace.
Gimbal
A gimbal is a motorized mount that holds a camera or sensor steady and points it independently of the aircraft’s motion. Most drone gimbals use two or three axes driven by brushless motors, with an IMU providing feedback. Gimbal performance directly limits image sharpness at long zoom, so gimbal motors, control loops and payload balance are designed together.
Gimbal stabilization accuracy
Gimbal stabilization accuracy is the angular error a gimbal holds while the aircraft vibrates and maneuvers, usually stated in degrees. The tighter the figure, the less blur and jitter at high zoom, where a tiny angle covers many pixels. Aerora states a stabilization figure of ±0.005° for its gimbals, driven by ADRC control (see Aerora’s drone technology).
Global navigation satellite system (GNSS)
GNSS is the general term for satellite positioning systems, including GPS (U.S.), Galileo (EU), GLONASS (Russia) and BeiDou (China). A multi-constellation receiver tracks several systems at once for better availability and accuracy. On drones, GNSS feeds the autopilot’s position estimate, geofencing, return to home and Remote ID, so its failure modes shape many failsafes.
Global shutter
A global shutter is an image sensor readout that exposes every pixel at the same instant. A rolling shutter reads rows in sequence, which skews fast-moving scenes and warps images from a vibrating drone. Global shutter sensors are preferred for mapping, machine vision and visual odometry, where geometric accuracy matters more than the lowest cost or noise.
GPS spoofing
GPS spoofing is an attack in which a transmitter broadcasts fake satellite signals so a receiver computes a false position or time. A spoofed drone may drift off course or trigger return to home to the wrong place. Defenses include multi-constellation and multi-frequency receivers, signal authentication, and cross-checking GNSS against inertial and visual navigation.
GPS-denied navigation
GPS-denied navigation is the ability to keep an accurate position estimate when satellite signals are blocked, jammed or spoofed, such as indoors, under bridges or in contested areas. It relies on cameras, LiDAR, IMUs and algorithms like VIO and SLAM. Aerora’s collaboration with Lantronix targets edge-AI visual navigation. See the navigation sensors guide.
Ground control point (GCP)
A ground control point is a marked spot on the ground whose coordinates are surveyed precisely and then identified in aerial images. Photogrammetry software uses GCPs to tie a drone map to real-world coordinates and correct scale and tilt. RTK or PPK positioning can cut the number of GCPs needed, though surveyors often keep a few as checkpoints.
Ground control station (GCS)
A ground control station is the hardware and software an operator uses to plan missions, monitor telemetry, view video and command a drone. It ranges from a handheld controller with a screen to a rugged laptop or a vehicle-mounted console. Aerora pairs its GS7 ground station with its D64TR data link for 1080p video.
Ground effect
Ground effect is the change in lift and thrust when a rotor or wing operates close to a surface, which restricts the downward airflow. A hovering multirotor gains thrust within about one rotor diameter of the ground, so it can float or bounce during landing. Flight controllers and landing logic often have to account for it.
Ground sample distance (GSD)
Ground sample distance is the real-world width covered by one image pixel, usually quoted in centimeters per pixel. It depends on flight altitude, sensor pixel size and lens focal length. Mapping and inspection jobs start from a required GSD, which then sets the camera choice, flight height and how many images the survey needs.
Gyroscope
A gyroscope is a sensor that measures angular rate, the speed at which a vehicle rotates around each axis. Drones use MEMS gyroscopes as the primary input to the fastest control loop, because they respond almost instantly to rotation. Gyro bias drift means the integrated angle wanders over time, so it is corrected with accelerometer and magnetometer data.
H
Hardware-in-the-loop testing (HIL)
Hardware-in-the-loop testing (HIL) runs the real flight controller or electronics against a simulated vehicle and environment, so the actual firmware and hardware respond to simulated sensor data. It catches timing, driver and integration faults before first flight, and lets teams replay dangerous failure cases safely. ODMs use it during validation stages such as EVT and DVT.
Hexacopter
A hexacopter is a multirotor drone with six rotors, usually arranged in a ring with alternating spin directions. Compared with a quadcopter it can lift more and, with the right flight controller logic, may keep flying or land under control after losing one motor. It is common on heavier camera, survey and spraying platforms.
Highly accelerated life test (HALT)
Highly accelerated life testing pushes a product far beyond its specified limits in temperature, rapid thermal cycling and vibration to find weak points and failure modes early in design. It is a discovery test, not a pass-fail test. For a drone, HALT might reveal a cracked solder joint on an ESC or a connector that loosens under combined heat and vibration.
Highly accelerated stress screening (HASS)
Highly accelerated stress screening applies stresses, set from HALT results, to production units to expose latent manufacturing defects before shipment. Limits are chosen to catch weak units without using up much of a good unit’s life. Drone makers apply HASS or lighter screens to flight controllers and power electronics, where an early field failure can mean a lost aircraft.
Hot-swappable battery
A hot-swappable battery setup lets an operator replace a battery without powering down the aircraft or robot. It typically uses two packs, or a pack plus a small backup cell, so the flight computer, radios and payload stay on during the swap. This avoids reboot and re-initialization time between missions, which matters for inspection, delivery and robots that run shifts.
Hybrid gas-electric power
Hybrid gas-electric power combines a small combustion engine driving a generator with a battery that supplies peak loads. The engine’s fuel stores far more energy per kilogram than batteries, so hybrid multirotors and VTOL aircraft can fly much longer than battery-only designs. The costs are noise, vibration, maintenance and more complex thermal and fuel-system design.
Hydrogen fuel cell
A hydrogen fuel cell generates electricity by combining hydrogen and oxygen, with water as the byproduct. On drones it replaces or supplements the battery to extend endurance. Doosan Mobility Innovation, for example, says its DS30W hydrogen drone flies for about 2 hours. Tradeoffs include hydrogen storage and handling, refueling logistics, and a small buffer battery for peak power.
Hyperspectral camera
A hyperspectral camera records many narrow, contiguous spectral bands, often a hundred or more, instead of the few broad bands of a multispectral camera. That detail lets analysts identify materials, crop stress or minerals by their spectral signature. The tradeoffs are cost, weight, data volume and more demanding calibration and processing.
I
Image signal processor (ISP)
An image signal processor is the dedicated hardware that turns raw sensor data into a usable image through steps such as demosaicing, noise reduction, white balance, HDR and lens correction. On drones it is often built into the camera or the main system on chip. ISP quality and throughput shape image quality, video latency and power draw.
In-circuit test (ICT)
In-circuit test checks an assembled circuit board with a bed-of-nails fixture or flying probes that touch test points to find wrong values, shorts, opens and reversed parts. It finds assembly faults that optical inspection cannot see. ICT needs test points designed in, which is why design for test matters, and a dedicated fixture usually pays off only at higher volumes.
Inertial measurement unit (IMU)
An inertial measurement unit (IMU) is a sensor package that combines accelerometers and gyroscopes, and sometimes a magnetometer, to measure motion and rotation. It is the core sensor of every flight controller. IMU noise, temperature drift and vibration sensitivity limit estimation quality, which is why designs often use redundant or isolated IMUs. See the navigation sensors guide.
Inertial navigation system (INS)
An inertial navigation system (INS) computes position, velocity and orientation by integrating IMU measurements from a known start point, usually aided by GNSS. Adding position and velocity is what separates it from an AHRS. Higher-grade INS units hold accuracy longer during GNSS outages, which matters for mapping, BVLOS and GPS-denied drone missions.
Inference
Inference is the step where a trained AI model processes new input, such as a camera frame, and produces an output like a detection or classification. On drones and robots, inference runs onboard in real time, so its latency, power draw and accuracy limit what the vehicle can recognize and react to. Training, by contrast, usually happens offline on servers.
Ingress protection rating (IP rating)
An IP rating is a two-digit code from the IEC 60529 standard that states how well an enclosure keeps out solids and water. The first digit covers dust and objects, the second covers liquids, so IP67 means dust-tight and protected against temporary immersion. Drones for rain, spray or dusty sites need sealed motors, connectors and vents.
Injection molding
Injection molding is a process that forces molten plastic into a steel or aluminum mold to make identical parts at high volume. It gives low unit cost for drone shells, propellers and housings, but the mold is a large up-front cost with long lead time. ODMs such as Aerora handle tooling design and DFM before production. See drone services.
Internal resistance
Internal resistance is the opposition to current flow inside a battery cell, usually measured in milliohms. Higher resistance causes more voltage sag and heat under load. It rises as cells age or get cold, so it is a practical health indicator. Pack builders match cells by internal resistance, and Aerora runs in-house cell-level and pack-level testing on its custom packs.
International Traffic in Arms Regulations (ITAR)
ITAR is the U.S. State Department rule set, run by the Directorate of Defense Trade Controls (DDTC), that controls defense articles and services on the U.S. Munitions List. Drones specially designed for military use can fall under USML Category VIII. ITAR items need export licenses, and the rules limit which foreign persons, including factory staff abroad, may see the technical data.
IPC-A-610
IPC-A-610 is the industry standard for the acceptability of electronic assemblies, with photos and criteria for solder joints, component placement and cleanliness. It defines Class 1, 2 and 3, from general to high-performance electronics. Revision J, released in 2024, is current. Drone OEMs usually specify Class 2 or Class 3 for flight-critical boards in contracts with their assembler.
ISO 9001
ISO 9001 is the international standard for quality management systems, covering process control, document control, corrective action and continual improvement. Accredited third-party auditors certify against it. A revised edition, ISO 9001:2026, was published in September 2026, and certificates to the 2015 edition remain valid through a transition period. Most OEMs expect manufacturing partners to hold ISO 9001 certification.
K
KV rating
KV rating is a brushless motor’s no-load speed constant: the RPM it turns per volt applied, with no propeller fitted. A 2400KV motor on 16.8 V would spin about 40,000 RPM unloaded. KV says nothing about power or quality. Low-KV motors suit large propellers and endurance, while high-KV motors suit small, fast propellers.
L
Landing gear
Landing gear is the structure a drone rests on and lands on, such as skids, legs or wheels. It must absorb landing loads, keep props and payloads clear of the ground, and add as little weight and drag as possible. Some platforms retract the gear in flight so a gimbal camera gets a clear 360-degree view.
Laser rangefinder
A laser rangefinder measures distance by timing a laser pulse to a target and back. On drones it supplies precise range for target geolocation on EO/IR gimbals, altitude hold over terrain, and inspection standoff distance. Designers weigh maximum range, beam divergence, eye-safety class and integration with the gimbal’s pointing angle.
Latency
Latency is the delay between an event and its effect, such as between a camera capturing a frame and the pilot seeing it, or a stick input and the aircraft responding. Low, consistent latency matters for manual flight, FPV and remote inspection. It builds up across encoding, radio transmission, decoding and display, so each stage has its own budget.
Lead time
Lead time is the time between placing an order and receiving the goods. In drone programs it applies to components, tooling and finished units. Long-lead items such as some processors, thermal camera cores and battery cells can set the whole schedule, so teams order them early, sometimes before the design is frozen, and track them on the BOM.
Levels of autonomy
Levels of autonomy are scales that describe how much a vehicle decides and acts on its own, from full manual control to no human involvement. Cars use SAE J3016’s levels 0 to 5, but drones and robots have no single agreed scale, so vendors define their own. Buyers should ask which tasks, conditions and failure cases each claimed level actually covers.
LiDAR
LiDAR (light detection and ranging) measures distance by firing laser pulses and timing their return, building a 3D point cloud of the scene. Drone LiDAR maps terrain under vegetation, power line corridors and structures, and it supports obstacle avoidance. The FCC has proposed restrictions on foreign-made drone lidar, so buyers should check authorization status.
Lift-plus-cruise
Lift-plus-cruise is a VTOL layout with separate vertical lift rotors for takeoff and landing and a separate propeller for forward flight on a fixed wing. It is simpler than a tilt-rotor because nothing rotates, but the lift rotors become dead weight and drag once the wing is flying. Many long-range VTOL survey drones use it.
Lift-to-drag ratio (L/D)
The lift-to-drag ratio is the lift a wing or aircraft produces divided by its drag. It is the main measure of aerodynamic efficiency in cruise: a higher L/D means less power per unit of distance and a longer range. Fixed-wing UAVs reach far higher L/D than multirotors, which is why they fly longer missions.
Link budget
A link budget is an accounting of every gain and loss between a radio transmitter and receiver: transmit power, antenna gains, cable losses, path loss and fade margin. Engineers use it to predict usable range and to see how much margin is left for rain, obstructions or interference. It is the standard way to size antennas and power for a drone data link.
Lithium iron phosphate (LiFePO4)
Lithium iron phosphate is a lithium-ion chemistry that uses LiFePO4 as the cathode, with a nominal cell voltage of about 3.2 V. It stores less energy per kilogram than LiPo or other Li-ion cells but offers strong thermal stability and long cycle life. That makes it a good fit for ground robots, docking stations and ground support equipment more than flight packs.
Lithium polymer battery (LiPo)
A lithium polymer battery is a lithium-ion battery built as flat pouch cells, usually with a polymer or gel electrolyte. LiPo cells are about 3.7 V nominal and 4.2 V fully charged. They deliver very high discharge currents, which suits heavy-lift, agile and FPV drones. They need careful charging, storage near 3.8 V per cell, and retirement when swollen.
Lithium-ion battery (Li-ion)
A lithium-ion battery is a rechargeable battery that moves lithium ions between anode and cathode. In drone usage the term often means cylindrical cells such as 18650 and 21700, which store more energy per kilogram than typical LiPo packs but supply lower continuous current. They suit long-range and fixed-wing cruise. Aerora builds custom packs in LiPo, Li-ion, LiFePO4, 18650 and pouch formats.
M
Magnetometer
A magnetometer is a sensor that measures the strength and direction of the magnetic field, which a drone uses as a compass for heading. It is easily disturbed by motor currents, power wiring, steel structures and nearby metal, so designers mount it away from power electronics, often on a GPS mast, and calibrate it for each airframe.
Manufacturing yield
Manufacturing yield is the share of units that pass all tests, often tracked as first-pass yield (passing without rework) at each station. Low yield raises cost and points to process problems. On a drone line, yield is measured at SMT, board test, subassembly and final flight test, and a dip at one station points to a specific process or part to fix.
MAVLink
MAVLink is a lightweight open messaging protocol used between drones, ground control stations, companion computers and payloads. It defines standard messages for telemetry, commands, missions and parameters, and is supported by PX4, ArduPilot and most ground control software. MAVLink 2 added message signing for authentication, but encryption has to be provided by the radio link.
Maximum takeoff weight (MTOW)
Maximum takeoff weight is the heaviest total weight at which a drone is designed or allowed to take off, including batteries, payload and accessories. It drives motor, battery and structure sizing and sets the regulatory category. FAA Part 107 covers small unmanned aircraft under 55 pounds. See the glossary FAQ.
Mesh radio (MANET)
A mesh radio forms a mobile ad hoc network (MANET) in which each node relays traffic for the others, with no fixed base station. Drones, ground robots and operators can extend range by hopping data through each other, and the network reroutes when a node drops out. Mesh radios are common in drone swarms and military or public-safety teams.
Microbolometer
A microbolometer is an uncooled thermal detector whose pixels change electrical resistance as they absorb long-wave infrared radiation. It is the sensor inside most drone thermal cameras because it needs no cryogenic cooler, which keeps size, weight, power and cost low. Its sensitivity is described by NETD, and resolution commonly ranges from 160×120 to 640×512 pixels.
Minimum order quantity (MOQ)
Minimum order quantity is the smallest order a supplier or factory will accept for a part or product. MOQs come from setup costs, reel sizes and material batches. For a new drone with low early volumes, high MOQs on custom battery cells, molded parts or cables can tie up cash, so they are worth negotiating during new product introduction.
Model quantization
Model quantization converts an AI model’s weights and activations from 32-bit floating point to lower-precision formats such as INT8, shrinking memory use and speeding up inference. It lets detection models run in real time on drone and robot processors. The tradeoff is a possible accuracy loss, so teams validate quantized models on their own data. See the edge AI chips guide.
Moment of inertia
Moment of inertia is a measure of how hard it is to change an object’s rotation about an axis, based on how its mass is spread out. Mass placed far from the center raises it. On drones, a higher moment of inertia slows roll, pitch and yaw response, so heavy batteries and payloads are kept close to the center.
Multiple-input multiple-output (MIMO)
MIMO is a radio technique that uses several antennas at both ends of a link to send parallel data streams or to improve reliability through diversity. On drones it raises throughput and reduces dropouts as the aircraft turns and antennas are shadowed. It is usually paired with OFDM, as in Wi-Fi, LTE and many digital video links.
Multirotor
A multirotor is a rotorcraft drone that uses three or more fixed-pitch rotors and controls its motion by changing each motor’s speed. Quadcopters, hexacopters and octocopters are all multirotors. They hover precisely and are mechanically simple, but they use more energy per distance flown than fixed-wing aircraft. See custom drone platforms.
Multispectral camera
A multispectral camera captures several separate spectral bands, typically visible plus red-edge and near-infrared, with calibrated sensors. Agronomists use the bands to compute indices such as NDVI and track crop health. Aerora says its EO/IR integration model extends to multispectral sensors for agriculture (see drone uses in agriculture).
N
NDAA compliant
NDAA compliant is an industry label for drones and components that avoid the parts and sources barred by NDAA Section 848 and the American Security Drone Act. It is usually the supplier’s own claim, not a government certification like the Blue UAS lists, and it is separate from FCC Covered List status. Aerora, for example, describes its products as NDAA compliant but is not on the Blue UAS lists.
NDAA Section 848
Section 848 of the FY2020 National Defense Authorization Act bars the Department of Defense from buying or operating drones made in a covered foreign country, or that use flight controllers, radios, data transmission devices, cameras, gimbals, ground control systems or operating software from one. China was the first covered country, and Russia, Iran and North Korea were added later. See NDAA and Blue UAS requirements.
Neural processing unit (NPU)
A neural processing unit (NPU) is a processor block designed specifically to run neural network math, such as matrix multiplications, efficiently. On drone and robot SoCs, the NPU handles AI inference at far lower power than the CPU would. Its usable performance depends on supported data types, memory bandwidth and the maturity of the vendor’s software tools.
New product introduction (NPI)
New product introduction is the process of moving a product from design into volume production. It covers DFM reviews, supplier selection, tooling, test fixtures, pilot builds and the EVT, DVT and PVT gates. Good NPI finds cost, quality and supply problems before the ramp. ODMs such as Aerora run NPI within a Discover, Design, Prototype, Validate and Manufacture process (custom drone developers).
Noise equivalent temperature difference (NETD)
NETD is the smallest temperature difference a thermal camera can distinguish from its own noise, usually given in millikelvin (mK). A lower NETD means cleaner images and better detection of small temperature contrasts, such as moisture in a roof or a failing electrical joint. Compare NETD at the same lens f-number and scene temperature, since both change the result.
Normalized difference vegetation index (NDVI)
NDVI is a vegetation index calculated as (NIR minus Red) divided by (NIR plus Red), producing values from -1 to +1. Healthy plants reflect near-infrared strongly and absorb red light, so higher values usually mean denser, healthier vegetation. It is the most common output of agricultural drone surveys and needs a multispectral or modified camera.
O
Object detection
Object detection is a computer vision task that finds objects in an image and labels each with a class and a bounding box, such as “person” or “vehicle”. Drones use it for search and rescue, inspection, security and counting. Common model families include YOLO-style detectors, and onboard performance depends on model size, input resolution and the processor.
Object tracking
Object tracking follows a detected object across video frames, keeping a consistent ID and predicting its motion even through brief occlusion. On drones it can steer the gimbal or the aircraft to keep a target in view. Aerora’s gimbal camera payloads, listed on its solutions page, include AI object tracking.
Obstacle avoidance
Obstacle avoidance is a drone or robot’s ability to sense nearby objects and change course or stop to avoid hitting them. It uses stereo cameras, LiDAR, radar, time-of-flight or ultrasonic sensors, plus planning software. It differs from detect and avoid, which targets other aircraft; obstacle avoidance deals with terrain, buildings, trees and wires.
Octocopter
An octocopter is a multirotor drone with eight rotors, either on eight arms or as four coaxial pairs (an X8 layout). The extra rotors raise lift for heavy cinema cameras, LiDAR or spray tanks, and give more margin to continue flying after a motor failure. The cost is more weight, parts and power draw.
Optical flow
Optical flow is the apparent motion of image features between camera frames, used to estimate how fast a vehicle is moving over the ground. A downward-facing flow sensor paired with a rangefinder lets a drone hold position without GNSS, especially indoors. It struggles over featureless or reflective surfaces such as calm water or plain floors, and in low light.
Optical gas imaging (OGI)
Optical gas imaging uses an infrared camera filtered to the absorption band of a target gas, making leaks visible as a plume on screen. Methane OGI cameras are widely used for oil and gas leak detection, and drones let crews survey pipelines and tanks without climbing. Aerora says its sensor integration model extends to OGI payloads for methane detection (see Aerora’s services).
Optical zoom
Optical zoom changes magnification by moving lens elements, so the image keeps full sensor resolution. Digital zoom only crops and enlarges pixels. High optical zoom lets inspection drones read labels or spot cracks from a safe standoff distance, but it magnifies every vibration, so it demands precise gimbal stabilization.
Original design manufacturer (ODM)
An original design manufacturer designs and builds products that another company sells under its own brand. The ODM does much of the engineering, from architecture to tooling, while the brand owner sets requirements and sells the product. In drones and robotics, ODMs such as Aerora partner with OEMs to design, develop, manufacture and scale autonomous systems. The contract should state who owns the resulting IP.
Original equipment manufacturer (OEM)
An original equipment manufacturer is the company whose brand is on a product and that is responsible for it in the market. A drone OEM may design everything in-house or work with an ODM or contract manufacturer. The term is also used for makers of components sold to other builders, such as a motor or camera OEM supplying several drone brands.
Orthogonal frequency-division multiplexing (OFDM)
OFDM is a modulation scheme that splits a data stream across many closely spaced subcarriers, each carrying a slower signal. It tolerates multipath reflections and narrowband interference well, which suits drones flying near buildings and terrain. OFDM underpins Wi-Fi, LTE, 5G and most digital HD video links used on drones.
Orthomosaic
An orthomosaic is a single map image stitched from many overlapping aerial photos and corrected so that scale is uniform and features sit in their true positions. Unlike a simple mosaic, it removes lens distortion and relief displacement, so distances and areas can be measured. It is a standard deliverable in surveying, construction and agriculture (see drone mapping software).
P
Path planning
Path planning is computing a collision-free route from a start to a goal that respects the vehicle’s limits and mission constraints. Global planners use maps to find the overall route, while local planners react to obstacles in real time. Common methods include A*, RRT and optimization-based planners, and drones must also account for wind and energy.
Payload
A payload is the equipment a drone carries to do its job, such as a camera, LiDAR, gas sensor, sprayer or delivery package, as distinct from the parts needed to fly. Payload weight, power and data needs drive airframe size and endurance. ODMs such as Aerora integrate payloads with the flight system (see inspection payloads).
Payload capacity
Payload capacity is the extra weight a drone can carry beyond its own structure, propulsion and battery while still meeting its flight specs. It is set by thrust, MTOW and the endurance the mission needs. Aerora builds gimbal motors for payloads up to 3 kg. See inspection payloads.
PCB stack-up
A PCB stack-up is the arrangement of copper and insulating layers in a multilayer circuit board, including their order, thickness and materials. It sets trace impedance, return paths, shielding and heat spreading. High-speed boards for cameras, AI processors and radios need a stack-up planned early, because changing it later means rerouting the board.
Photogrammetry
Photogrammetry is the science of measuring and reconstructing 3D geometry from overlapping photographs. Drone photogrammetry software matches features across images to build point clouds, 3D meshes, digital surface models and orthomosaics. Accuracy depends on image overlap, ground sample distance, camera calibration and georeferencing through ground control points or RTK/PPK.
PID controller
A PID controller is a feedback control loop that corrects error using proportional, integral and derivative terms. It is the most common controller in drone flight stacks, used in cascaded loops for rate, attitude, velocity and position. PID is simple and well understood but needs retuning when mass, propellers or payload change, which motivates adaptive methods such as ADRC.
Point cloud
A point cloud is a set of 3D points, each with X, Y and Z coordinates and often color or intensity, that represents the surfaces of a scene. Drones produce point clouds from LiDAR or photogrammetry. Engineers use them to measure volumes, model structures, classify ground and vegetation, and build maps for autonomous navigation.
Post-processed kinematic (PPK)
PPK is a GNSS positioning method that records raw satellite data on the drone and a base station, then corrects the positions after the flight. It reaches centimeter-level accuracy like RTK but does not need a live correction link, so radio dropouts do not affect results. PPK is popular for mapping flights over long corridors or remote sites.
Power distribution board (PDB)
A power distribution board is a circuit board that routes battery power to the ESCs and other loads from one main input. Many PDBs also include current sensing, voltage regulators or a BEC for the flight electronics. Its copper weight, connector ratings and layout must handle peak current without excess heating, and poor layout here is a common source of EMI.
Power integrity
Power integrity is the discipline of delivering clean, stable supply voltage to every chip on a circuit board. It covers voltage drop, ripple, decoupling capacitors and the impedance of power planes. On drone electronics, fast processors, radios and image sensors share boards with noisy motor power, so poor power integrity shows up as resets, image noise or radio dropouts.
Prepreg
Prepreg is a composite material in which carbon or glass fibers come already impregnated with a measured amount of resin that is only partly cured. It is kept cold until layup, then cured under heat and pressure in an oven or autoclave. It gives consistent fiber-to-resin ratios, which suits flight-critical drone arms and wing skins.
Printed circuit board (PCB)
A printed circuit board is a laminated board with copper traces that mechanically supports and electrically connects electronic components. A drone contains many: flight controller, ESCs, power distribution, radios, camera and compute boards. PCB design choices such as layer count, copper weight and component placement drive cost, weight, heat, EMI and how easily the board can be manufactured.
Production validation test (PVT)
Production validation test is the last build stage before mass production. PVT units are made on the real production line with final tooling, fixtures, operators and processes, at meaningful volume. The goal is to prove the line meets yield, cycle time and quality targets. PVT units are often sellable, and passing PVT clears the program to ramp.
Propeller efficiency
Propeller efficiency is the useful power a propeller delivers, thrust times airspeed, divided by the shaft power the motor puts in. It applies to forward flight, while figure of merit covers hover. Matching propeller diameter and pitch to the cruise speed and motor keeps efficiency high and extends range on fixed-wing and VTOL drones.
Propeller pitch
Propeller pitch is the distance a propeller would move forward in one revolution if it screwed through the air with no slip. It is usually the second number in a prop size, so a 10×4.5 prop is 10 inches across with 4.5 inches of pitch. Higher pitch suits faster flight, while lower pitch gives more static thrust.
Pulse-width modulation (PWM)
Pulse-width modulation encodes a value in the duration of a repeating pulse or controls average power by switching on and off quickly. In drones, classic servo-style PWM sends ESC and servo commands as pulses of roughly 1,000 to 2,000 microseconds. ESCs also use high-frequency PWM internally to control motor current.
PX4
PX4 is an open-source autopilot for drones and other uncrewed vehicles, hosted by the Dronecode Foundation under the Linux Foundation and released under the permissive BSD-3 license. Its permissive license lets companies keep product changes private, which makes it popular with commercial OEMs. It supports MAVLink and connects to ROS 2 through a DDS bridge. See the autonomy stacks guide.
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Quadcopter
A quadcopter is a multirotor drone with four rotors, two spinning clockwise and two counterclockwise, controlled by changing each motor’s speed. It is the simplest and most common drone layout, with the fewest parts per unit of lift. It cannot hold stable flight after losing a motor without special control modes.
R
Radar altimeter
A radar altimeter measures height above the ground by timing radio waves reflected off the terrain below. Unlike a barometer, it reports true height above ground level, and unlike optical sensors it works in dust, fog and darkness. Drones use it for terrain following, precision landing and low-altitude spraying.
Radiometric thermal imaging
Radiometric thermal imaging records a calibrated temperature value for every pixel, not just a relative heat picture. Inspectors can then measure hotspots, set alarms and compare readings over time in analysis software. Accurate results require the correct emissivity, distance and atmospheric settings, so radiometric data is standard for electrical, solar and building inspections.
Range
Range is the maximum distance a drone can fly on one charge or fuel load, or in operational terms, how far it can go and return. Energy, speed and aerodynamic efficiency set the flight range, while the radio data link often sets the practical range. Specs should state which limit applies.
Real-time kinematic (RTK)
RTK is a GNSS technique that uses corrections from a nearby base station or network to reach centimeter-level position accuracy in real time. It works by measuring the carrier phase of satellite signals. On drones, RTK improves mapping accuracy, reduces the need for ground control points and enables precise landing and repeatable inspection paths.
Real-time operating system (RTOS)
A real-time operating system is an operating system that guarantees tasks run within defined time limits. Flight controllers depend on this determinism to run sensor reads, estimation and control loops on schedule. Examples include NuttX, which PX4 runs on, ChibiOS, used by ArduPilot, plus FreeRTOS and Zephyr. Compare autonomy software stacks.
Remote controller
A remote controller is the handheld unit a pilot uses to fly a drone, with sticks, switches and often a built-in screen and radio. Enterprise controllers add sunlight-readable displays, hot-swappable batteries and mission apps. The controller’s radio and firmware are part of the command and control link, so they fall under the same range and authorization checks.
Remote ID
Remote ID is the FAA requirement, under 14 CFR Part 89, for drones to broadcast identity, location and control station or takeoff location during flight. As of September 2026 it is fully in force: operators comply with a Standard Remote ID drone, an add-on broadcast module or by flying in an FAA-recognized identification area. OEMs selling into the U.S. usually build Standard Remote ID into new designs (see the drone FAQ).
Return merchandise authorization (RMA)
A return merchandise authorization is the approval and tracking number a manufacturer issues before a customer sends back a faulty product for repair, replacement or credit. RMA data, such as failure modes and return rates, feeds corrective action and sustaining engineering. Aerora pairs its manufacturing in Vietnam with full RMA support led by its U.S. team.
Return to home (RTH)
Return to home (RTH) is an automatic mode in which a drone flies back to its takeoff point or a set home location and lands. It is triggered by the pilot or by a failsafe, such as a lost link or low battery. Designers set a safe return altitude and route logic so the aircraft clears obstacles on the way back.
ROS 2
ROS 2 (Robot Operating System 2) is an open-source middleware and toolset for building robot software, using DDS for publish-subscribe communication between nodes. It adds real-time support, security features and multi-robot networking over the original ROS. Drones use it on companion computers for perception and planning. See the autonomy stacks guide.
S
Semi-solid-state battery
A semi-solid-state battery is a lithium battery that uses a gel or partly solid electrolyte in place of some of the liquid electrolyte. The aim is higher energy density and better safety than conventional lithium-ion. Semi-solid drone packs are on sale: Tattu, for example, lists packs at 280 to 350 Wh/kg. Compare cycle life, discharge curves and cold performance, not headline density alone.
Sensor fusion
Sensor fusion is combining data from several sensors to get an estimate more accurate and reliable than any single sensor could give. A drone fuses IMU, GNSS, barometer, magnetometer and sometimes camera or LiDAR data, usually with a Kalman filter. Good fusion also detects and rejects a faulty sensor instead of trusting it blindly.
Sensor redundancy
Sensor redundancy is fitting duplicate or dissimilar sensors, such as two or three IMUs, GNSS receivers or magnetometers, so the system keeps working when one fails. The autopilot compares their outputs and switches away from a sensor that disagrees. Redundancy raises cost, weight and board space, so teams apply it where a failure would cause a crash.
Sensorless motor control
Sensorless motor control runs a brushless motor without Hall sensors or encoders, estimating rotor position from the motor’s back-EMF or from a model of its currents. Most drone ESCs are sensorless, which saves weight, wiring and cost. The hard part is startup and very low speed, where back-EMF is weak, so good estimator firmware matters.
Signal integrity
Signal integrity is the quality of an electrical signal as it travels from driver to receiver on a board or cable. Problems include reflections, crosstalk, ringing and timing skew. It matters for the high-speed links in drone electronics, such as MIPI camera lanes, USB, Ethernet, PCIe and memory buses, where a marginal layout can cause dropped frames or intermittent faults.
Simultaneous localization and mapping (SLAM)
Simultaneous localization and mapping (SLAM) builds a map of an unknown environment while tracking the vehicle’s position within it. It uses cameras (visual SLAM), LiDAR or both, often fused with IMU data. SLAM lets drones and robots navigate indoors, underground or in GPS-denied areas, at the cost of significant onboard compute.
Smart battery
A smart battery is a battery pack with a built-in BMS and data interface that reports state of charge, cell voltages, temperature, cycle count and health to the aircraft or charger. Enterprise drones use smart batteries so the autopilot can plan return-to-home reserves and fleets can log and retire packs by condition, not guesswork.
Software-in-the-loop testing (SITL)
Software-in-the-loop testing (SITL) runs the autopilot or autonomy software on a desktop computer against a simulated vehicle and world, with no flight hardware involved. PX4 and ArduPilot both support SITL with simulators such as Gazebo. Teams use it for fast, automated regression tests of flight logic, missions and failsafes before moving to hardware-in-the-loop and flight tests.
Solid-state battery
A solid-state battery is a lithium battery whose electrolyte is fully solid instead of liquid or gel. It promises higher energy density and lower fire risk. For drones it is early: as of September 2026, Factorial Energy reported its first commercial drone battery order (July 2026, covering solid-state and liquid-electrolyte cells), but volume supply remains limited. Compare options in our drone battery guide.
State of charge (SOC)
State of charge is how much usable energy is left in a battery, expressed as a percentage of its full capacity. A BMS estimates it from voltage, coulomb counting and cell models, because voltage alone is unreliable under load. Accurate SOC lets an autopilot reserve enough energy for return to home and landing.
State of health (SOH)
State of health is a measure of a battery’s condition compared with when it was new, usually based on remaining capacity and internal resistance. SOH falls with cycles, heat, deep discharges and storage at full charge. Fleet operators track it to retire packs before they sag or fail in flight, rather than relying on age or cycle count alone.
Stator
A stator is the stationary part of an electric motor, a stack of laminated steel teeth wound with copper coils. In drone motors its size is often in the name: a 2207 motor has a 22 mm diameter, 7 mm tall stator. A bigger stator generally means more torque and more weight, which shapes propeller and battery choices.
Surface-mount technology (SMT)
Surface-mount technology is the method of placing components directly onto pads on a circuit board’s surface instead of through drilled holes. An SMT line prints solder paste, places parts with pick-and-place machines and reflows them in an oven. Nearly all drone electronics, including flight controllers, ESCs and camera boards, are built this way, with inspection after reflow.
Sustaining engineering
Sustaining engineering is the engineering work done after a product ships: fixing field issues, handling component obsolescence, qualifying alternate parts, reducing cost and updating firmware. For drones with multi-year service lives, it keeps the product buildable and compliant as suppliers, regulations and parts change. It is often scoped separately from the original development contract.
System on chip (SoC)
A system on chip is a single chip that integrates CPU cores with other functions such as a GPU, AI accelerator, image signal processor, video codecs and connectivity. SoCs power drone cameras, companion computers and robot brains. ODMs such as Aerora design electronics on SoC platforms from Qualcomm, NVIDIA, Rockchip, Intel, TI, ST and Ambarella. See edge AI chips.
System on module (SOM)
A system on module is a small board that carries an SoC, memory, storage and power circuits, and plugs into a custom carrier board. Using a SOM lets a drone or robot team skip the hardest high-speed layout and focus on the carrier. Aerora’s dual EO/IR case study, for example, used Lantronix Open-Q SOMs with Qualcomm processing.
T
Tail-sitter
A tail-sitter is a VTOL aircraft that takes off and lands resting on its tail, then pitches forward about 90 degrees to fly on its wing. It needs no tilting mechanism or separate lift rotors, which saves weight. The tradeoff is a hard transition to control and sensitivity to wind while hovering on the ground.
Telemetry
Telemetry is the stream of status data a drone sends to the ground, such as position, altitude, speed, battery state, link quality and system health. The ground station displays it live and logs it for analysis. Protocols such as MAVLink define the message format, and telemetry logs are the first place engineers look after a failure.
TensorRT
TensorRT is NVIDIA’s software development kit for optimizing and running trained neural networks on NVIDIA GPUs, including Jetson modules used in drones and robots. It speeds up inference through layer fusion, kernel selection and reduced precision such as FP16 and INT8. It applies only to NVIDIA hardware; other chip vendors provide their own toolchains.
Tethered drone
A tethered drone is an aircraft connected to the ground by a cable that supplies power and often data. Because power comes from the ground, flight time is limited by maintenance and weather rather than battery capacity, while altitude and movement are limited by tether length. Common uses are persistent surveillance, communications relays and event monitoring.
Thermal camera
A thermal camera forms an image from infrared radiation emitted by objects, showing temperature differences instead of reflected light. Drone thermal cameras, usually built on uncooled microbolometers, find people at night, hot electrical parts, roof moisture and failing solar cells. The FCC has proposed restrictions on foreign-made drone thermal components (see drones for infrastructure inspection).
Thermal design power (TDP)
Thermal design power is the amount of heat, in watts, a processor’s cooling system is designed to remove under a sustained workload. On drones and robots, the TDP of the SoC or AI module drives heat sink size, airflow and weight. Many edge AI modules offer selectable power modes, so teams can trade compute performance against heat and battery draw.
Thermal management
Thermal management is the design work that keeps motors, ESCs, batteries, processors and cameras inside their safe temperature ranges. On drones it uses rotor airflow, heat sinks, heat spreaders and venting, balanced against weight and sealing. Edge AI processors and hot climates make it a larger issue. See edge AI chips.
Thermal runaway
Thermal runaway is a self-accelerating failure in which a battery cell heats up, triggers further heat-releasing reactions and can vent, catch fire or spread to neighboring cells. Causes include overcharge, internal shorts, crush damage and overheating. Drone pack designers limit the risk with BMS protection, cell spacing, barriers and abuse testing. See our drone FAQ.
Thrust-to-weight ratio
Thrust-to-weight ratio is the total maximum thrust of a drone’s propulsion divided by its weight. Above 1 it can climb vertically. Multirotor designers commonly aim for about 2:1 so there is margin for control, wind and climb. Aerora designs motors from the 08 series to the 95 series, covering small drones to heavy-lift platforms.
Tilt-rotor
A tilt-rotor is an aircraft whose rotors point up for vertical takeoff and landing, then tilt forward to pull the aircraft in wing-borne flight. It combines hover with efficient cruise but adds tilt mechanisms and a hard control transition. Aerora reports its ADRC flight control proven on tilt-rotor platforms. See flight controllers.
Time-of-flight sensor (ToF)
A time-of-flight sensor measures distance by timing how long emitted light takes to reflect back, either per pixel in a depth camera or as a single beam. ToF sensors are small, light and low power, so drones and robots use them for short-range obstacle detection, landing and indoor positioning. Bright sunlight can limit their range (see sensors for autonomous navigation).
Tooling
Tooling is the custom equipment used to make parts in volume, such as injection molds, stamping dies, jigs and assembly fixtures. It is a large one-time cost and often a long-lead item. Soft aluminum tools suit early builds, and hardened steel tools suit high volumes. For drone shells and arms, changes after tooling release are slow and costly.
TOPS
TOPS (tera operations per second) is a headline measure of AI processor throughput, meaning trillions of operations per second. Vendors usually quote it at INT8 precision, and sometimes with sparsity, which can inflate the figure. TOPS alone does not predict real performance on a drone, because memory bandwidth, supported layers, software and power limits often matter more.
Trapezoidal commutation
Trapezoidal commutation, also called six-step control, drives a brushless motor by energizing two of its three phases at a time in abrupt steps. It is simple, cheap and fast to run, and it still dominates hobby FPV ESCs. The tradeoff versus field-oriented control is more torque ripple, audible noise and heat, especially at low speed.
V
Vertical takeoff and landing (VTOL)
Vertical takeoff and landing describes an aircraft that can take off, hover and land vertically without a runway. In drone terms it usually means a hybrid that hovers like a multirotor and cruises on a wing, such as a tilt-rotor, tail-sitter or lift-plus-cruise design. It gives fixed-wing range without launchers or landing strips.
Vibration isolation
Vibration isolation is the use of dampers, gel mounts, wire-rope isolators or soft mounting to keep motor and propeller vibration away from sensitive parts. On drones it protects the IMU from noisy readings and keeps cameras and LiDAR free of jello and blur. The isolators must be tuned so they do not resonate near motor speeds. See navigation sensors.
Video transmission system
A video transmission system sends live camera video from the drone to the pilot or ground station, as analog or, more often now, digital HD. It encodes the video, usually with H.264 or H.265, then transmits it over a radio link. Buyers compare resolution, range, latency, frame rate, encryption and how gracefully quality degrades as the signal weakens.
Visual-inertial odometry (VIO)
Visual-inertial odometry (VIO) estimates a vehicle’s motion by combining camera feature tracking with IMU data. The camera corrects the IMU’s drift, and the IMU covers fast motion and brief visual dropouts. VIO is a key method for GPS-denied flight, though accuracy degrades in low light, fog or over textureless surfaces, and drift builds up over long distances.
W
Waypoint navigation
Waypoint navigation is flying an automated route defined by a series of geographic points, each with an altitude and optional actions such as taking a photo or hovering. Mapping, inspection and delivery missions rely on it. Planning tools upload the mission to the autopilot, usually over MAVLink, and the aircraft follows it using GNSS or another position source.
Weight budget
A weight budget is a line-by-line allocation of a drone’s total mass to each subsystem, such as frame, motors, batteries, electronics, payload and wiring, with margin held back. Teams track it through the program because weight growth cuts flight time and payload. It usually works backward from the MTOW and endurance targets.
White label
White label describes a finished product built by one company and sold by others under their own brands, with little change beyond logos and packaging. It differs from ODM work, where the product is designed or tailored for one customer. White-label drones reach market quickly but offer little differentiation, and the reseller still owns the NDAA and FCC diligence.
Wind tolerance
Wind tolerance is the highest sustained wind or gust speed in which a drone can take off, hold position and land safely. It depends on thrust margin, airframe drag, control tuning and weight. Inspection drones working near towers, bridges and turbines need a stated, tested wind rating. See inspection drones.
Wing loading
Wing loading is an aircraft’s weight divided by its wing area. A low wing loading lets a fixed-wing UAV fly slower, launch by hand and turn tighter, but makes it more affected by gusts. A high wing loading gives a faster, smoother ride in turbulence and needs a higher takeoff and landing speed.
Wire harness
A wire harness is a bundled assembly of wires, connectors and protective sleeving that carries power and signals between a product’s boards and parts. In drones, harnesses run through arms, gimbals and payload bays. Harness routing affects EMI, vibration wear and assembly time, and IPC/WHMA-A-620 is the common workmanship standard. See UAV contract manufacturers.
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