What is the purpose of illumination in radar systems?

The purpose of illumination in radar systems is primarily related to detecting and pointing at targets. Illumination refers to the transmission of radar signals aimed at illuminating a target, allowing for the detection of that target's position and other characteristics. By focusing radar energy on a target, the system can receive echoes and gather information necessary for tracking, identifying, and engaging that target effectively. This function is critical in various applications, including military operations, where precise targeting information is vital for operational success.

In contrast, other options are focused on different aspects of radar functions. For instance, ship navigation involves radar systems that assist in avoiding obstacles and aiding in course plotting, but this is not the primary use of illumination. Covering the area behind the ship and determining weather patterns are additional functionalities that radar systems may achieve, but they aren't directly related to the illuminating aspect focused on target detection and tracking.