What is the primary function of search radar?

The primary function of search radar is to continuously scan space and provide initial target detection. This type of radar operates by emitting radio waves that travel through the atmosphere and bounce off objects, allowing it to identify the presence and location of various targets, such as aircraft or ships. The continuous scanning capability is essential for tracking moving targets across a wide area, making it invaluable for situational awareness in many applications, including air traffic control and military surveillance.

The other options describe functions that are more specific or secondary to the overall purpose of search radar, such as providing detailed positional data on an already detected target, guiding aircraft during landing phases, or specifically detecting maritime vessels along coastlines. These are typically executed by other types of radar systems or with the assistance of additional technologies, rather than being the primary role of search radar itself.