What is the primary function of secondary radar in air traffic control?

• A. To provide more accurate positional information from transponders
• B. To enhance ground radar capabilities
• C. To detect weather conditions near the air traffic
• D. To track the speed of vehicles on the runway

Answer: (A)

The primary function of secondary radar in air traffic control is to provide accurate positional information from transponders. Secondary radar systems rely on the signals emitted by an aircraft's transponder, which respond to radar interrogations from the ground station. This two-way communication allows air traffic controllers to receive not only the aircraft’s position but also additional information, such as identification and altitude.

This capability significantly enhances situational awareness and contributes to the safe and efficient management of air traffic. While ground radar capabilities and weather detection are important in air traffic control, these functions are typically associated with primary radar or dedicated weather radar systems. Tracking the speed of vehicles on the runway is not a primary function of secondary radar, as that is typically monitored by other systems tailored for ground operations.