The Doppler frequency shift is the difference between the:

The Doppler frequency shift is the difference between the:

• A. Transmitted frequency and the pulse repetition frequency
• B. Received frequency and the pulse repetition frequency
• C. Received frequency and the transmitted frequency
• D. Frequency bandwidth and the pulse repetition frequency

Answer: (C)

Doppler frequency shift comes from the motion between the radar and the target, which makes the frequency of the echo differ from the frequency the radar sent out. The amount of shift is the difference between the received frequency (the echo) and the transmitted frequency (the original signal). This is what allows you to infer the target’s radial velocity. The pulse repetition frequency is just how often pulses are sent, not the frequency change caused by motion, and bandwidth is the range of frequencies in the signal, not the motion-induced shift.

Doppler frequency shift comes from the motion between the radar and the target, which makes the frequency of the echo differ from the frequency the radar sent out. The amount of shift is the difference between the received frequency (the echo) and the transmitted frequency (the original signal). This is what allows you to infer the target’s radial velocity. The pulse repetition frequency is just how often pulses are sent, not the frequency change caused by motion, and bandwidth is the range of frequencies in the signal, not the motion-induced shift.