Due to linear frequency modulation rectangular pulse has high side-lobes, the LFM Gaussian pulse is instead. Using ambiguity function, this Gaussian pulse has no side-lobe, but with little bigger time compression gain of time resolution. Cause shift-frequency jamming is major trend against linear frequency modulation pulse radar, the formulae of three interference parameters according to radar signal detection using constant false alarm rate are set up in detail, which are defined as peak power losses, peak time delay and pulse width losses. It can be found the receiver output waveform of shiftfrequency jamming is similar to target echo but with time delay and power loss. Then, the deception jamming is discussed with radar interference equation
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