UAV Components

Module 3

UAV components
Main structural elements of drones

Frame

Propellers

Motors

Battery

Flight control cards

Power distribution board

Electronic speed controller

Drone controller and receiver

Payload and Sensors

Elements of UAV Components
UAV Frames
Frame is the drone body is the main skeleton system where all drone parts are placed and holds all subsystems together The physical body is designed for light weight and high strength (carbon fiber, composites). There are different types of frames.Monocopter, Bicopter,Tricopter, Quadcopter, Hexacopter, and Octocopter.The different types of drone frames to select depend on mission needs, financial situation, and operational needs.
Propulsion System
Propulsive systems generates thrust to lift and maneuver the UAV. It Includes: Motors (mostly brushless DC motors – BLDC), Propellers (2-blade/3-blade, fixed or foldable), Electronic Speed Controllers (ESCs), and Power distribution board (PDB.
UAV Frame vs Motors Applications
Drone TypeMotorsStabilityPayload CapacityBest Use Case
Monocopter1LimitedVery LowBasic vertical flight
Bicopter2BasicLowSimple applications
Tricopter3GoodMediumHobby flying, light photography
Quadcopter4ExcellentMedium-HighMost applications, consumer drones
Hexacopter6Very HighHighProfessional photography, redundancy
Octocopter8ExceptionalVery HighHeavy payloads, professional filming
Power Systems

Power Systems provides energy to motors, avionics, and payload.

PDB (Power Distribution Board),is the circuit board organizes the power connections of batteries, ESCs, and other onboard systems. In particular, it is responsible for power distribution from the flight battery to each electronic speed controller for the drone control board.

In some cases, the PDB is also used to power components such as the camera, LED taillights, and flight controller.

The battery, described as the heart of the drone, is the most important part in terms of power generation and performance.

Flight Control System

Fligh control Systems is the brain of the UAV which provides stabilizes and controls motion.

It containtsContains:Flight Controller (FC),IMU sensors: Accelerometer, Gyroscope, Magnetometer,GPS module, Barometer (altitude measurement), and Telemetry module (communication with ground station).

Communication System

Communication Systems ensures data exchange between UAV and ground control.

It performs through:Radio Controller + Receiver (RC Link),Telemetry (915 MHz / 2.4 GHz / 5.8 GHz), and FPV system (camera + video transmitter).

Payloads and Sensors
CategoryExamples
Imaging Payloads RGB camera, thermal camera, multispectral, hyperspectral, low-light camera, 360° camera
Remote Sensing Payloads LiDAR, Synthetic Aperture Radar (SAR), Ground Penetrating Radar (GPR)
Environmental Sensors Air quality sensors, meteorological sensors, radiation sensors, wildlife tracking sensors
Agricultural Payloads Spraying tanks, seed-dropping system, plant health sensors
Industrial Inspection Sensors Thermal imagers, zoom cameras, ultrasonic sensors, magnetic sensors
Delivery Payloads Cargo boxes, insulated medical transport pods
Navigation Sensors GPS/GNSS, IMU, magnetometer, barometer, optical flow sensor, ToF sensor
Obstacle Avoidance Sensors Ultrasonic sensors, LiDAR rangefinder, stereo vision cameras
Communication & Mission Sensors FPV camera, telemetry radio, ADS-B receiver, RF sensors
Component Weight Distribution
CategoryDescriptionTypical Weight Share
Structural Weight (Wstr)Airframe, wings, fuselage, landing gear; main load-bearing elements30–50%
Propulsion System (Wprop)Motors/engines, propellers, ESCs, fuel system10–25%
Power System (Wpower)Battery, fuel cells, power electronics20–40%
Avionics (Wav)Flight controller, GPS, sensors, telemetry module5–15%
Payload (Wpayload)Camera, LiDAR, sprayer, delivery package, mission sensors5–30%
Total Weight (Wₜ)W = Wstr + Wprop + Wpower + Wav + Wpayload100%
Payload & Sensors
Payload Types
There are mainly four types of payloads for a UAV: (1) cargo/freight, (2) reconnaissance, surveillance, monitoring (civil/military), (3) military payload (weapon), and (4) electronic warfare. In each type, there are a group of payloads which can be carried by a UAV for various objectives.
Surveillance Payload

UAVs can carry various surveillance packages, including electro-optical and infrared cameras, SAR, SIGINT, and multi- and hyperspectral imagers for reconnaissance/surveillance missions.

There are basically three types of surveillance missions: 1. Convoy over-watch, 2. Route surveillance, and 3. Fixed surveillance.

Three primary functions of surveillance sensors are: 1. detection, 2. recognition, and 3. Identification.

Two most common kinds of surveillance payloads (i.e., sensors) are: 1. Daytime or night-vision camera, 2. Radar.

Scientific Payload

Some significant ones are spectrometers, radiation detectors, environmental sensors, and atmospheric sensors.

A spectrometer analyzes the spectrum of light to identify the chemical elements of the target. For instance, Mars Rover is equipped with a rock-zapping laser and telescope. It produces more than a million watts of power focused for five one-billionths of a second to hit targets up to seven meters away. The result is a glowing ionized gas which it observes with the telescope. The light, then, is analyzed by spectrometer.

A radiation detector monitors high-energy atomic and sub atomic particles coming from the sun, from distant supernovae and other sources to determine whether conditions are favorable to life and preserving evidence of life. Naturally occurring radiation is harmful to microbes and human life. The Earth atmosphere has a protective magnetic field against radiation.

An environmental sensor records environmental information such as carbon monoxide, water vapor, aerosols, ozone, gases composing air, air viscosity, chemicals in the air, and ultraviolet radiation. The wind speed and direction, temperatures, and humidity are measured by electronic devices. The atmospheric pressure is measured by a barometer. Some other atmospheric phenomena include rain, icing, snow, wind, gust, turbulence, hurricane, tornado, thunderstorm, and lightning.

An atmospheric sensor records atmospheric information such as wind speed, wind direction, air pressure, relative humidity, air temperature, ground temperature. The wind speed and direction, temperatures, and humidity are measured by electronic devices. The atmospheric pressure is measured by a barometer.

UAV Military Missions & Weapon Payloads
CategorySub-CategoryDescription / Key PointsExamples
Group 1: Lethal MissionsStrike / AttackDelivery of lethal warhead to destroy target.Precision attack, missile strike
InterceptionNeutralizing or destroying hostile threats.Air defense interception
Destructive OperationsOperations using explosive mechanisms.IED neutralization, landmine destruction
Group 2: Non-Lethal MissionsReconnaissance & SurveillanceObservation and intelligence gathering without weapons.ISR missions
Electronic Intelligence (ELINT)Collecting electronic signals for intel assessment.Signal monitoring, radar mapping
Target DesignationLaser-guiding targets for precision weapons.Laser target marking
Weapon Payload CategoryStores & MunitionsPhysical weapons carried by UAVs.Missiles, rockets, bombs
Under-Wing MountingExternally attached weapons released or launched.UAV hardpoints
Payload–Range Trade-OffMore weapons reduce range; fewer increase endurance.Mission optimization
Design Considerations for Armed UAVs (UCAVs)Take-Off CapabilityMust safely take off with full weapon load.Reduced fuel for heavier payloads
Mechanical & Electrical InterfacesSecure connections between UAV and weapons.Pylons, release systems
Launch SafetyMust ensure stability and safety during firing.Separation safety
Branch-Specific Payload DifferencesArmy missiles lighter than Air Force missiles.Predator uses lighter Hellfire missiles
Example Weapon PayloadAGM-114 Hellfire MissileAir-to-surface precision missile for anti-armor/targets.Used for high-value target strikes
Key Characteristics163 cm length, 45 kg, solid-fuel motor, laser-guided, 8 km range.Predator carries up to 2 Hellfires
UAV Camera Systems
CategorySub-Types / ClassesKey CharacteristicsTypical UAV Use
Electro-Optic (EO) Monochrome / Color Cameras, HDTV, Low-light cameras, Multi-spectral cameras Operates in visible band (0.4–0.7 μm), high clarity, true-color images General surveillance, inspection, mapping
Infrared (IR) Near-IR, Mid-wave IR, Long-wave IR thermal cameras Captures heat signatures, works in dark/obscured conditions, 0.7–1000 μm Night operations, search & rescue, target detection
Laser-Based Sensors Laser Designators, Range Finders, LIDAR Provides range, designation marking, synthetic mapping Target marking, terrain mapping
Camera Format Types Rangefinder, SLR, TLR, Instant, Large/Medium Format, Subminiature, Digital, Camcorder, Panoramic, VR Varies by optics, size, pixel count, and lens system Specialized documentation, panoramic mapping, VR capture
Low-Cost UAV Cameras FPV Cameras, GoPro-class EO modules Light, low-power, 720p–1080p, Wi-Fi enabled, low price (~$60) Hobby FPV, training, short-range surveillance
Advanced Rover/UAV Cameras Multi-camera arrays, autofocus arms, high-resolution sensors Up to 1600×1200 px, 13.9 μm resolution, f/8.5–f/9.8, 720p video, multimillion-dollar systems Planetary missions, high-precision robotics
Gimbal-Mounted Systems 2-axis, 3-axis gyro-stabilized EO/IR turrets 360° azimuth view, stabilization, zoom, tracking Reconnaissance, ISR missions (e.g., CONTROP, Stalker VXE30)
Selection Parameters Dimensions, weight, resolution, FPS, FOV, zoom, power, software, storage, focus, IR sensitivity, etc. Determines suitability for mission-profile and payload limits Design & procurement evaluation
Components of UAVs by Dr Aishwarya Dhara
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