What does radar cross-section (RCS) describe?

• A. The apparent size and reflectivity of an object as seen by radar, affecting detection probability.
• B. The energy transmitted by the radar to the target.
• C. The angle at which radar beams are steered during scanning.
• D. The speed of the radar system's updates.

Answer: (A)

Radar cross-section describes how detectable a target is by radar, essentially the apparent size and reflectivity of the object as seen by the radar, which determines the strength of the returned echo and thus the likelihood of detection. It represents an effective area that scatters energy back toward the radar, not the physical size of the object. RCS depends on factors like the target’s size, shape, material, orientation relative to the radar, and the radar’s wavelength and polarization. A large, flat surface facing the radar typically yields a larger RCS, while certain shapes or angles can reduce it (as with stealth designs). RCS is independent of how much energy the radar transmits or how the antenna scans or how fast updates occur; those describe transmit power, antenna steering patterns, and refresh rate, respectively.