SAR Anti-jamming Method Using LFM Signal with Random Segmentation

To active coherent jamming a new method is proposed by designing the orthogonal waveforms. Firstly, the design method of linear frequency modulated segmented recombination signal is given. By segmenting the linear frequency modulated (LFM) signal and then randomly recombining it,, the generated waveforms have good autocorrelation and crosscorrelation performance. Thus, the proposed method cannot only suppress false target jamming, but also resist frequency shift suppression jamming. Secondly, the signal characteristics is studied, and the correlation performance versus different segmentation number is analyzed. Thirdly, the anti-jamming analysis of the proposed method is presented when the designed waveform is applied. Finally, several simulations are conducted to demonstrate the effectiveness of the proposed method. The results show that LFM with random segmentation and recombination (RSLFM) is better than LFM signal in resisting false target jamming and suppressing jamming.