UAS
Uncrewed aircraft system: the aircraft plus associated control and support elements, not only the vehicle.
Explore in context →DRONE SCHOOL / REFERENCE
Drone engineering glossary
Plain-language explanations of the aircraft, components, sensors, simulation evidence and lifecycle terms you'll encounter while learning how drones work.
Engineering context: Definitions are educational. A design term, model output or reference number is not a substitute for independent aircraft testing or operating authorization.
Aircraft families
UAV
Uncrewed aerial vehicle: the aircraft itself, commonly discussed as part of a UAS.
Explore in context →Multirotor
A powered-rotor aircraft that uses multiple rotors for lift and control.
Explore in context →Quadcopter
A multirotor aircraft with four main lifting rotors.
Explore in context →Hexacopter
A multirotor aircraft with six main rotors; more rotors do not automatically prove greater safety.
Explore in context →Fixed-wing
Aircraft that derives lift from wings during forward flight.
Explore in context →VTOL
Vertical takeoff and landing capability; it does not by itself indicate whether the craft is fixed-wing or rotor-borne in cruise.
Explore in context →Hybrid VTOL
Aircraft concept combining vertical-lift operations with another flight regime, often wing-borne travel.
Explore in context →Tailsitter
A VTOL configuration that changes its overall aircraft attitude between vertical and forward flight.
Explore in context →Tiltrotor
A configuration that changes rotor orientation to support more than one flight regime.
Explore in context →Tethered drone
Aircraft connected by a tether that may impose constraints or supply certain services; specific safety design remains critical.
Explore in context →ROV
Remotely operated underwater vehicle, often connected by tether for control or data.
Explore in context →AUV
Autonomous underwater vehicle: an underwater robotic platform designed to perform tasks without continuous direct human steering.
Explore in context →USV
Uncrewed surface vessel: a robotic platform operating at the water surface.
Explore in context →UGV
Uncrewed ground vehicle, including wheeled or tracked robotic platforms.
Explore in context →Physics and design
Airframe
The mechanical structure or body that supports an aircraft's systems.
Explore in context →Lift
An aerodynamic force acting on an aircraft; its origin depends on the relevant flow and vehicle configuration.
Explore in context →Thrust
Propulsive force produced by a propulsion system under defined operating conditions.
Explore in context →Drag
Resistance due to movement relative to a fluid such as air or water.
Explore in context →Hover
Flight where a vehicle approximately maintains position relative to an external reference.
Explore in context →Payload
Equipment or material carried to perform a mission, apart from the basic vehicle function.
Explore in context →Mass budget
An accounting of expected mass contributions and uncertainties across the vehicle.
Explore in context →Power budget
An accounting of electrical power demand, supply limitations and assumptions.
Explore in context →Center of gravity
The effective location of the body's mass for analyzing forces and motion.
Explore in context →Endurance
How long an aircraft can operate under stated conditions; not a universal property independent of payload and environment.
Explore in context →Range
Distance achievable under stated conditions, which differs from endurance.
Explore in context →Energy
Capacity to do work, commonly tracked for batteries in watt-hours under defined conditions.
Explore in context →Power
Rate of energy use or transfer, commonly expressed in watts.
Explore in context →Battery capacity
A stated energy-storage or charge specification that must be interpreted with voltage, chemistry, conditions and safe handling.
Explore in context →Electronics and control
ESC
Electronic speed controller: electronic drive hardware used to regulate compatible motor operation.
Explore in context →Flight controller
Embedded computing and control system that uses sensor input and control logic to manage vehicle behavior.
Explore in context →IMU
Inertial measurement unit, typically sensing angular motion and acceleration; estimates require calibration and algorithms.
Explore in context →GNSS
Global navigation satellite system: satellite-based positioning systems whose accuracy and availability vary.
Explore in context →Barometer
Sensor that measures atmospheric pressure, sometimes used as part of altitude estimation.
Explore in context →Magnetometer
Sensor that measures magnetic field; its interpretation can be affected by local magnetic disturbances.
Explore in context →Radio link
Wireless connection used for communication, telemetry or authorized control; performance is environment-dependent.
Explore in context →Telemetry
Data collected or communicated about a system's state and behavior.
Explore in context →Companion computer
A computing unit that may run additional processing alongside a vehicle's core control systems.
Explore in context →Firmware
Software installed in embedded hardware that influences the behavior of a device.
Explore in context →Failsafe
Predefined behavior intended to reduce risk when specified faults or loss-of-control conditions occur; needs real verification.
Explore in context →Remote ID
Regulatory identification capability for certain drones, with applicability determined by jurisdiction and aircraft/operation type.
Explore in context →Sensor fusion
Combining information from multiple sensors or estimates to infer system state.
Explore in context →Sensors and mapping
RGB camera
Imaging sensor that records visible-color channels, useful for images but not automatically quantitative scientific conclusions.
Explore in context →Thermal camera
Sensor that records infrared-related image information; physical temperature interpretation requires relevant calibration and context.
Explore in context →Multispectral imaging
Imaging across selected spectral bands to support defined observation or research methods.
Explore in context →Photogrammetry
Estimating geometry or measurements from overlapping images under defined methods and reference constraints.
Explore in context →Ground sample distance
An approximate ground dimension represented by one image pixel under stated imaging geometry.
Explore in context →Orthomosaic
A geometrically corrected composite of overlapping images intended to represent a mapped area.
Explore in context →Ground control point
Known reference location used in geospatial acquisition or processing to support position or geometric accuracy.
Explore in context →Ground truth
Independent observations used to evaluate or interpret remotely sensed results.
Explore in context →Radiometric calibration
A method for relating sensor image measurements to consistent radiometric quantities or comparison standards.
Explore in context →Geometric calibration
Methods used to relate image geometry to physical positions, shapes and measurements.
Explore in context →Accuracy
Closeness of a result to an accepted reference value or measurement, defined for the metric and conditions.
Explore in context →Precision
Repeatability or consistency of measurements; a precise result may still be inaccurate.
Explore in context →Data provenance
Information identifying the origin, transformations and evidence lineage of a dataset.
Explore in context →Simulation and evidence
Concept render
Visual depiction of a design; not evidence that hardware was built or flown.
Explore in context →Scenario manifest
Record of planned simulation inputs and assumptions; not proof of an executed run.
Explore in context →SITL
Software-in-the-Loop testing: executing software against a defined simulated system environment.
Explore in context →HIL
Hardware-in-the-Loop testing: incorporating relevant actual hardware into a defined simulation/test setup.
Explore in context →Physics engine
Software that computes model behavior according to specific physical assumptions; output fidelity depends on the model.
Explore in context →Telemetry log
Recorded observations of a system or simulator run, requiring source identity and time integrity to be trustworthy.
Explore in context →Model fidelity
How accurately a model represents the relevant real-world behavior for a stated purpose.
Explore in context →Digital twin
Digital representation linked to physical-system evidence and validated for a stated use, not merely a photorealistic model.
Explore in context →Verification
Checking that an artifact or implementation satisfies specified requirements.
Explore in context →Validation
Checking that a system or model is adequate for its intended real-world purpose.
Explore in context →Calibration
Adjustment or assessment against reference observations to characterize measurement or model behavior.
Explore in context →Uncertainty
A characterization of what is not precisely known about measurements, models or estimates.
Explore in context →Evidence maturity
The demonstrated level of support for a claim: proposal, assumption, simulation, measurement or authorized operation.
Explore in context →Manufacturing and lifecycle
EBOM
Engineering bill of materials: the structure, identity and revisions of items intended by a design.
Explore in context →MBOM
Manufacturing bill of materials: production-oriented structure describing items and material usage through assembly processes.
Explore in context →Supplier qualification
Process for determining whether a supplier meets defined requirements for the intended procurement.
Explore in context →Revision control
Tracking and approving changes to design, software, parts or processes so evidence remains tied to the correct version.
Explore in context →Traceability
Ability to connect a part or process to its origin, revisions, inspections and downstream use.
Explore in context →Yield
Proportion of manufactured output meeting defined acceptance criteria for a given process.
Explore in context →Scrap
Material or units rejected from production and not economically or appropriately recoverable through the process.
Explore in context →Rework
Additional controlled processing to bring nonconforming output into accepted requirements.
Explore in context →Quality assurance
Systematic activities intended to make processes capable of consistently meeting specified requirements.
Explore in context →Quality control
Inspection or testing activities that assess output against defined requirements.
Explore in context →Serviceability
How readily qualified personnel can inspect, maintain or repair an item with appropriate instructions and access.
Explore in context →Lifecycle cost
Total relevant cost over design, acquisition, production, operation, maintenance and retirement.
Explore in context →Airworthiness
Suitability of an aircraft for safe flight under applicable technical and regulatory conditions, not asserted by a software concept.
Explore in context →Operating authorization
Permission or compliance status for a particular aircraft operation under the applicable aviation authority; distinct from software analysis.
Explore in context →Source-based further reading
For precise operational or scientific uses, confirm definitions and requirements against the relevant current documentation.