用于合成孔径雷达抗欺骗干扰的多相编码优化方法

Optimization of Polyphase Codes for Anti-deceptive Jamming of Synthetic Aperture Radar

欺骗干扰能够获得距离和方位向压缩增益,使用较小功率即可实现对合成孔径雷达(SAR)的有效干扰。针对SAR的欺骗干扰抑制问题,提出了基于多个互正交多相编码在脉间捷变的抗干扰方法。利用加权循环算法,优化多相编码,提高自相关峰值,降低自相关旁瓣和互相关峰值,提高抗转发式欺骗干扰性能。通过仿真比较了模拟退火算法、遗传算法优化多相编码与本文优化所得多相编码的自相关和互正交性能,并从多个不同干扰功率入手,对研究的多相编码抗欺骗干扰性能与二相编码进行了对比,20 d B干扰时该方法仍可达到88%的检测概率,证明了方法有效性。

Deceptive jamming for synthetic aperture radar（SAR） can get the compression gains of range and azimuth direction, and the performance of SAR can he 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 correla- tion function and the peak of cross-correlation function. As a result, the performance of anti-repeater jam- ming 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.