Which component of radar technology allows it to filter out stationary objects?

The Doppler filter is a crucial component of radar technology that specifically allows the system to distinguish between moving and stationary objects. When radar emits a signal, it measures the frequency change of the reflected signal that returns from moving objects. This frequency change is known as the Doppler effect.

The Doppler filter analyzes these frequency shifts and is designed to detect only the signals that show a change indicative of movement. Stationary objects do not produce a significant Doppler shift because they do not change position relative to the radar source. As a result, the Doppler filter effectively eliminates these stationary signals from consideration, allowing the radar system to focus only on the moving objects that are relevant for speed detection.

By filtering out stationary reflections, the radar can accurately determine the speed of vehicles or other moving targets, thereby enhancing the reliability and precision of speed detection operations.