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Ambiguity function
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== LFM pulse == [[Image:Lfm ambiguity function.png|280px|thumb|right|Ambiguity function for an LFM pulse]] A commonly used [[radar]] or [[sonar]] pulse is the linear frequency modulated (LFM) pulse (or "chirp"). It has the advantage of greater bandwidth while keeping the pulse duration short and envelope constant. A [[constant envelope]] LFM pulse has an ambiguity function similar to that of the square pulse, except that it is skewed in the delay-Doppler plane. Slight Doppler mismatches for the LFM pulse do not change the general shape of the pulse and reduce the amplitude very little, but they do appear to shift the pulse in time. Thus, an uncompensated Doppler shift changes the target's apparent range; this phenomenon is called range-Doppler coupling.
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