How are targets classified by the SENTINEL radar system?

The SENTINEL radar system classifies targets primarily into categories that reflect different types of aerial threats. The correct classification includes fixed wing aircraft, rotary wing (helicopters), missiles, and Unmanned Aerial Vehicles (UAVs). This classification is essential for understanding the nature of the threats that the radar is designed to detect and track, which primarily involve various forms of aerial combat or reconnaissance aircraft.

Fixed wing and rotary wing categories refer to the traditional aircraft types that are commonly encountered in air defense scenarios. Missiles are included because they represent a significant threat that can potentially be launched from various platforms, and UAVs are increasingly used in modern warfare for surveillance and attack purposes. By categorizing targets this way, operators can efficiently prioritize threats and develop appropriate responses based on the type of incursion detected.

The other classification options mention ground vehicles and naval vessels, which are not primary targets for the SENTINEL radar system that focuses on airborne threats. Their classification does not align with the operational scope of the SENTINEL system, which is designed to monitor and engage air threats rather than surface or sub-surface entities. Thus, the chosen classification provides the most accurate representation of the threats the SENTINEL radar system is intended to address.