Which type of radar is primarily used in New Zealand for surveillance?

The choice indicating that both Primary and Secondary Surveillance Radar are utilized primarily for surveillance in New Zealand is correct because it reflects the integrated approach to air traffic management employed in the country.

Primary Surveillance Radar (PSR) operates by bouncing radio waves off an aircraft, allowing air traffic controllers to detect the presence and range of aircraft. However, it does not provide information regarding the aircraft's identity or altitude. In contrast, Secondary Surveillance Radar (SSR) enhances the capabilities of PSR by utilizing transponders in the aircraft, which respond with altitude and identification information when interrogated by the radar system. This combination allows for more comprehensive surveillance as air traffic controllers can track both the location and identity of the aircraft.

In New Zealand, the integration of both types of radar systems is vital for effective air traffic control, particularly in ensuring safety and efficiency in the airspace. This dual system allows controllers to maintain awareness of all aircraft, whether they are equipped with transponders or not, thereby improving situational awareness and operational safety.

Understanding the functionality and application of both radar types helps in recognizing their significance in modern aviation surveillance systems.