Abstract: The random linear frequency modulated ratio synthetic aperture radar(RLFMR-SAR) uses the mismatch between the target echoes and the jamming signals to counter deceptive jamming by applying the matched compression of target returns and jamming trap to 1-D or 2-D compressed signals.The LFM slope coefficient and matched suppression ratio are defined,the block diagrams are given for three methods.The conditions for application and the factors influencing the performance are also studied.Quantitative analysis is made through computer simulation to the performance of the three techniques,with results consistent with theoretic analysis.