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matched filter output is distorted into a [[sinc function]]. The
greater the Doppler shift, the smaller the peak of the resulting sinc,
and the more difficult it is to detect the target. {{citation_needed}}
In general, the square pulse is not a desirable waveform from a pulse compression standpoint, because the autocorrelation function is too short in amplitude, making it difficult to detect targets in noise, and too wide in time, making it difficult to discern multiple overlapping targets.
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