Cross-Ambiguity Function for a Linear FM Pulse Compression Radar

Three-dimensional computer plots of the cross-ambiguity function are developed in order to illustrate the discrimination against improperly coded signals in a pulse compression matched filter. The filter response envelope amplitude is plotted as a function of time and frequency offset for input signals mismatched in FM rate, pulsewidth, and timedomain amplitude weighting. Illustrative examples of the unnormalized cross-ambiguity diagram reveal the signal-to-interference ratio improvement of this filter in the presence of signals with no FM or reverse slope FM. The effect of Hamming weighting on the waveform response is also shown.