一种基于粒子滤波的雷达抗欺骗干扰方法

Method against radar's deception jamming based on particle filter

针对雷达的抗欺骗干扰问题,利用欺骗干扰信号强于目标信号的特点,基于粒子滤波进行了抗欺骗干扰研究。当存在欺骗干扰时,粒子滤波中各粒子的重要性权值会明显减小,据此可以检测干扰,并对受到干扰的数据点进行置零处理,使得欺骗干扰不再与匹配滤波器匹配,从而达到抑制干扰的目的。设计的粒子滤波算法不需要估计系统状态转移函数、系统量测噪声,从而使得算法更具实用性。仿真结果表明,该算法能有效地抑制欺骗干扰,且对干信比不敏感。

According to radar＇s anti-deception-jamming,this paper studies an algorithm based on particle filter with the fact that the power of deception jamming is higher than target echo signal.When deception jamming appears,the importance weight values of particles in particle filter will get smaller,and we could detect the jamming and set the sampling point zero.In this way,the jamming will not match with the matched filter,and the jamming is restrained.In order to make the algorithm more practicable,this paper develops an improved particle filter that doesn＇t need to estimate state transition equation and measurement noise.Simulations are given to show that this approach can effectively restrain deception jamming and it is little affected by jamming to signal ratio.