(SEM VIII) THEORY EXAMINATION 2024-25 FUNDAMENTALS OF DRONE TECHNOLOGY

FUNDAMENTALS OF DRONE TECHNOLOGY (KOE080)

B.Tech – Semester VIII | Theory Examination (2024–25)

SECTION A

(Attempt all questions – brief but descriptive)

a) Categories of Unmanned Aerial Vehicles (UAVs)

Unmanned Aerial Vehicles are broadly classified based on their design, operation, and application. The main categories include fixed-wing UAVs, rotary-wing UAVs, and hybrid UAVs. Fixed-wing UAVs resemble conventional aircraft and are suitable for long-endurance missions such as surveillance and mapping. Rotary-wing UAVs, such as quadcopters and hexacopters, can hover and perform vertical take-off and landing, making them ideal for inspection and photography. Hybrid UAVs combine features of both fixed-wing and rotary-wing designs to achieve efficiency and flexibility.

b) Aerodynamic Drag and Its Relevance to UAV Design

Aerodynamic drag is the resistive force that acts opposite to the direction of motion of a UAV as it moves through air. It arises due to friction between the air and the UAV surface as well as pressure differences around the airframe. Drag plays a critical role in UAV design because excessive drag reduces speed, endurance, and energy efficiency. Minimizing drag through streamlined airframe design improves flight performance and increases battery life.

c) Components of a Drone’s Avionics System

The avionics system of a drone consists of electronic components responsible for navigation, control, and communication. It includes sensors such as gyroscopes and accelerometers, a flight controller or processor, communication modules, GPS receivers, and actuators like servos. Together, these components ensure stable flight, navigation accuracy, and real-time monitoring.

d) Function of Autopilot in a Drone

The autopilot is the core control system of a drone that automatically stabilizes and navigates the UAV without continuous human input. It processes data from sensors, compares it with desired flight parameters, and sends corrective signals to motors and control surfaces. Autopilot systems enable features such as waypoint navigation, altitude hold, and return-to-home functions.

e) PID Control in UAVs

PID control refers to a feedback control mechanism that uses proportional, integral, and derivative terms to regulate UAV motion. The proportional component corrects present errors, the integral component eliminates accumulated errors, and the derivative component predicts future errors. PID control is essential for maintaining drone stability, smooth flight, and accurate maneuvering.

f) Telemetry Systems and Their Importance

Telemetry systems are communication systems that transmit real-time data from the drone to the ground control station. This data includes altitude, speed, battery status, GPS position, and sensor readings. Telemetry is vital for monitoring drone performance, ensuring safety, and making informed control decisions during flight.

g) Waypoint Navigation

Waypoint navigation is a method where a drone follows a predefined set of geographical coordinates autonomously. For example, in agricultural surveying, waypoints are programmed to allow the drone to cover an entire field systematically. This improves efficiency and ensures accurate data collection.

h) Challenges in In-Flight Testing of Drones

In-flight testing of drones presents challenges such as unpredictable weather conditions, communication interference, sensor calibration issues, and safety risks. Testing must be carefully planned to avoid crashes, data loss, and regulatory violations while ensuring reliable performance evaluation.

i) Stealth Design Strategies in UAVs

Stealth strategies in UAVs focus on reducing detectability. Common approaches include using radar-absorbing materials and designing airframes with minimal radar cross-section. These techniques enhance survivability in sensitive missions.

j) Regulatory Aspects for Drones in India

Drone operations in India are regulated by the Directorate General of Civil Aviation (DGCA). Regulations cover drone classification, registration, pilot licensing, no-fly zones, and operational safety. Compliance ensures safe and lawful drone usage.

SECTION B

(Attempt any three – long descriptive answers)

a) Classification and Applications of UAVs

UAVs are classified based on factors such as range, endurance, altitude, and application. Small UAVs are commonly used for photography, surveillance, and inspection, while medium and large UAVs are employed in defense, disaster management, and scientific research. Applications of UAVs span agriculture, logistics, environmental monitoring, infrastructure inspection, and military operations, demonstrating their versatility.

b) Airframe Configurations and Their Effect on Performance

Drone airframe configurations significantly influence performance characteristics such as stability, speed, payload capacity, and endurance. Fixed-wing configurations provide high efficiency and long flight duration, while multi-rotor configurations offer vertical take-off and precise hovering. Hybrid configurations attempt to balance efficiency with maneuverability, making them suitable for complex missions.

c) Integration and Configuration of Drone Avionics Systems

The integration of drone avionics involves assembling sensors, processors, communication modules, and actuators into a cohesive system. Configuration includes calibrating sensors, setting control parameters, and programming flight modes. Proper integration ensures reliable data processing, stable control, and efficient communication between components.

d) Communication Systems Used in Drones

Drones use various communication systems such as radio frequency links, satellite communication, and Wi-Fi-based systems. These systems enable command transmission, telemetry feedback, and payload data transfer. Reliable communication is essential for safe operation, especially in long-range or autonomous missions.

e) Future Prospects and Challenges in Drone Navigation and Testing

The future of drone navigation lies in autonomous systems, artificial intelligence, and sensor fusion. However, challenges such as regulatory constraints, cybersecurity risks, and complex testing requirements must be addressed. Continuous innovation and standardization are necessary for widespread adoption.

SECTION C

History and Evolution of UAVs

The development of UAVs began with early unmanned balloons and evolved through military target drones during the 20th century. Technological milestones such as GPS integration, advanced sensors, and autonomous control systems transformed UAVs into versatile platforms used across civilian and military domains.

Indian Drone Regulations and Design Impact

Indian drone regulations influence design standards by enforcing weight categories, safety features, and geofencing requirements. Designers must ensure compliance with DGCA guidelines, which promotes safe and standardized drone development.

Processor and Servos in Drone Avionics

The processor acts as the brain of the drone, processing sensor data and executing control algorithms. Servos convert electrical signals into mechanical motion, controlling control surfaces or payload mechanisms. Together, they ensure precise maneuvering and system responsiveness.

Role of Gyroscopes and Accelerometers

Gyroscopes measure angular velocity, while accelerometers measure linear acceleration. These sensors provide essential data for attitude estimation and stabilization, enabling the drone to maintain balance and orientation during flight.

PID Feedback Control System

The PID feedback control system continuously compares actual flight parameters with desired values and applies corrective actions. This system ensures stable flight, smooth transitions, and accurate control, making it fundamental to UAV operation.

Payload and Telemetry Systems

Payload systems carry mission-specific equipment such as cameras or sensors, while telemetry systems transmit flight data to the ground station. In real-world applications like surveying and surveillance, these systems work together to collect and transmit valuable information.

Ground Control Software

Ground control software assists in mission planning, real-time monitoring, and data visualization. It enables operators to program waypoints, monitor telemetry, and adjust flight parameters, enhancing operational efficiency.

In-Flight Drone Testing

In-flight testing involves evaluating performance, stability, communication, and safety under real conditions. It is crucial for validating design assumptions, identifying faults, and ensuring mission readiness.

Conceptual UAV for Agricultural Surveillance

A UAV designed for agricultural surveillance includes a multi-rotor platform, GPS, multispectral camera, telemetry system, and autonomous navigation. This system enables crop health monitoring, field mapping, and precision farming.

UAV with Stealth Capabilities

A stealth UAV design incorporates low-radar-signature materials, streamlined shapes, and reduced acoustic noise. These design choices minimize detectability and enhance mission effectiveness in sensitive environments.