Nyquist Velocity

Q: What is the maximum Doppler-shifted frequency that can be unambiguously measured?

If you sample wave at the frequency of the wave (f_s=f), can't reconstruct it -->>

Need to sample the wave with frequency (f_s)of at least 2f. -->>

with a pulsed radar, then f_s = PRF. -->>

so PRF is greater than or equal to 2f.

or f_max = PRF/2