In which situation is ground surveillance radar primarily used?

Ground surveillance radar is primarily used in border security and military operations because it is designed to detect and track objects on or near the ground, providing critical situational awareness to military personnel and border security agents. This type of radar system can monitor large areas for unauthorized crossings, track potential threats, and gather intelligence about troop movements or activities in conflict zones. The technology allows for surveillance under various conditions, making it invaluable for maintaining security and operational effectiveness in military applications as well as in policing and border control scenarios.

The other choices do not align with the specific capabilities of ground surveillance radar. Weather observation typically relies on different types of radar systems, such as Doppler radar, which are optimized to detect precipitation, wind patterns, and atmospheric conditions. Marine navigation utilizes radar systems designed for detecting ships and obstacles on or near the water, which is different from ground surveillance radar that focuses on land-based activities. Traffic monitoring does involve radar, but it generally uses different radar technologies that are tailored specifically for tracking vehicles and monitoring road conditions, rather than for the broader applications of ground surveillance.