多通道SAR-GMTI虚假运动目标成像特性分析

Image characteristic analysis of deceptive moving target in multi-channel SAR-GMTI

基于三通道SAR-GMTI系统,研究了单干扰机生成的虚假运动目标的速度和定位特性。首先,建立虚假运动目标在三通道SAR-GMTI中的信号模型,然后利用三通道对消干涉处理推导虚假运动目标的幅度和干涉相位,在此基础上分析其估计径向速度和定位后方位向位置。研究表明,单干扰机生成的虚假静止/运动目标均会被检测为运动目标,估计干涉相位由设定径向速度和方位向位置共同决定,导致估计径向速度与设定值不一致,定位后方位向位置由估计干涉相位的缠绕周期决定。

Based on three-channel SAR-GMTI system,the velocity and location of the deceptive moving target generated by single jammer are studied.Firstly,the signal model of deceptive moving target generated by single jammer is built.Then,the amplitude and interferometric phase of deceptive moving targets are derived.On the basis,the estimated radical velocity and azimuth location of deceptive jamming are analyzed.Study result shows that both the deceptive stationary target and moving target can be considered as moving target,the estimated interferometric phase is decided by both radical velocity and azimuth location,which leads to the mismatch of radical velocity between the setting value and the estimated value,and the estimated azimuth location is decided by the wrapped cycle of the estimated interferometric phase.