CPI回波Stretch处理雷达抗欺骗式干扰算法

摘要

由于射频存储技术的飞速发展,转发式的欺骗干扰成为影响雷达精确跟踪的一大威胁.针对欺骗式干扰,本文提出了一种基于CPI回波的Stretch处理抗干扰算法,该算法利用前一个相干处理周期(CPI)跟踪得到的距离和速度值,估计当前CPI的时延和多普勒频率,构造基带回波并与当前接收到的CPI信号进行Stretch处理,将原本相干的目标信号与干扰信号从频域上分离,将处于高频处的干扰滤除,然后进行Stretch逆处理,恢复出只含有目标的信号,送入动目标检测(MTD)处理和恒虚警检测模块.仿真结果表明,采用本文所提出的抗干扰算法,在单个假目标干扰和密集欺骗式干扰的场景下,都可以有效抑制干扰,并且该算法在机动目标,多散射中心目标和多目标跟踪的情景下仍然适用,可以正确跟踪目标信号.%Due to the rapid development of digital radio frequency memory,transmitted deceptive jamming become a big threat to affect the precision tracking radar.To suppress the deceptive jamming,an anti jamming algorithm based on Stretch processing with CPI echo is proposed.The delay and Doppler frequency of the current CPI are estimated using the distance and speed from the last coherent processing interval.Target signal and jamming signal are separated by using the Stretch processing between constructed baseband echo and the current CPI signal.After filtering the high frequency interference,the signal only contains target for moving target detection and constant false alarm detector.Simulation results show that the proposed anti-jamming algorithm can restrain the interference effectively in the situation of single false targets jamming or dense deceptive jamming.Furthermore,the algorithm can still be applied in the condition of flexible target,multi-scattering center target and multi-target tracking.