A Method of Anti Interrupted Sampling Multiple Shift Frequency Repeater Jamming for Dual-Frequency Radars

Multiple frequency shift jamming is an effective jamming pattern for dual-frequency continuous wave(DFCW) radars. When it was used into self-defense jamming, it can produce multiple false targets and affect the detection efficiency of radar. In this paper, an anti-jamming method is proposed to combat interrupted sampling multiple frequency shift repeater jamming(ISMFSRJ) for DFCW radars. Time-frequency(TF) analysis and Hough transform are used to identify the real target Doppler frequency in the TF plot. Theoretical analysis and simulation verification are carried out. The results of simulation prove that the proposed method can effectively combat ISMFSRJ when the jammer’s repeater signal time is shorter than the radar signal processing period.