JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III Year UNMANNED AIR VEHICLES Previous Question Paper (August - 2022 - R18)

A generic Unmanned Aerial Vehicle (UAV) system consists of an integrated set of components designed to perform autonomous or remotely piloted missions. The architecture comprises four primary segments: the air vehicle, the ground control station (GCS), the data link, and the payload.

• Air Vehicle: The physical platform providing lift and propulsion. It includes the airframe, avionics, flight control system, and power plant. Examples include fixed-wing aircraft like the RQ-7 Shadow for long-endurance surveillance and multi-rotor systems like the DJI Mavic for localized imaging.
• Ground Control Station (GCS): The interface where the operator monitors flight telemetry, plans mission paths, and commands the vehicle. It serves as the hub for mission planning and data processing.
• Data Link: The communication bridge (typically RF-based) that facilitates command and control (C2) uplinks and sensor data downlinks between the GCS and the UAV.
• Payload: The mission-specific equipment carried by the UAV, such as cameras, sensors, or delivery mechanisms, which defines the primary utility of the system.

UAV payloads are categorized based on their functional requirements for the mission. Common types include:

• Imaging Payloads: Electro-optical (EO) cameras, Infrared (IR) sensors, and multispectral/hyperspectral cameras for reconnaissance and mapping.
• Communication Payloads: Signal relays or transponders used to extend communication range in remote areas.
• Atmospheric/Environmental Sensors: LiDAR for 3D terrain modeling, gas sniffers, or meteorological sensors.
• Weaponry/Delivery Systems: Kinetic payloads or cargo release mechanisms for logistics.

The interaction between the payload and the air vehicle is critical to UAS performance:

• Weight and Balance: Payload mass directly impacts the center of gravity (CG) and the total takeoff weight, affecting flight stability, stall speed, and battery/fuel consumption.
• Aerodynamic Drag: External payloads or pods increase parasitic drag, reducing the vehicle's endurance and maximum airspeed.
• Power Consumption: High-power sensors draw energy from the main battery, significantly reducing the flight time available for the air vehicle.
• Vibration and EMI: The air vehicle's propulsion system can introduce vibrations or electromagnetic interference (EMI) that degrade the performance of sensitive optical or electronic payloads.