How does Pulse Radar measure the speed of an object?

Pulse Radar measures the speed of an object primarily by analyzing the frequency shift of the returned signal. This fundamental principle is based on the Doppler effect, which states that when a wave source moves relative to an observer, the frequency of the wave changes. In the context of pulse radar, when the radar sends out pulses and they reflect off a moving object, the frequency of the returned signals will differ from that of the emitted signals.

If the object is moving towards the radar system, the frequency of the returned signal will be higher, and if the object is moving away, the frequency will be lower. This change in frequency allows the radar system to calculate the speed of the object using well-established mathematical relationships. By measuring this frequency shift and knowing the properties of the radar wave, precise speed calculations can be made for targets detected by the radar.

Other approaches mentioned, such as calculating distance over time or detecting signal strength, do not directly yield information on speed without additional context or calculations. The color shift of the target is not relevant in radar technology, as radar operates in the electromagnetic spectrum differently than visible light, which is what color pertains to. Thus, frequency analysis is the key to determining speed in pulse radar systems.