Abstract: Deceptive jamming for synthetic aperture radar(SAR) can get the compression gains of range and azimuth direction, and the performance of SAR can be affected by low power. An anti-jamming method based on the agility of multiple orthogonal phase codes between neighboring pulses is proposed for the deceptive jamming suppression of SAR. The long polyphase codes are optimized based on weighted cyclic algorithm to increase the of the auto-correlation peak of codes and decrease the sidelobe of correlation function and the peak of cross-correlation function. As a result, the performance of anti-repeater jamming is enhanced. The comparison between the performances of auto-correlation and cross-correlation of polyphase codes optimized using simulated annealing algorithm, genetic algorithm and the proposed methodr are compared by simulation. The anti-jamming performance of polyphase code is compared with that of the biphase codes under various jamming powers. The results show that the proposed can be used to achieve a detection probability of 88% even at jamming power of 20 dB.

Key words: radar engineering, synthetic aperture radar, polyphase code, weighted cyclic algorithm, anti-jamming