SAR虚假图像干扰信号快速生成方法研究

欺骗干扰是对合成孔径雷达的一种有效干扰方式。如何准确、快速地生成虚假图像欺骗干扰信号是对合成孔径雷达（synthetic aperture radar，SAR）实施欺骗干扰的关键问题。从分析合成孔径雷达点目标回波信号的特性出发，发现只要将干扰机接收到的雷达信号进行延时和乘以方位向补偿相位处理，就可以产生任意位置的虚假干扰目标信号。并根据虚假目标与干扰机的坐标位置推算出所要的延时和补偿相位量的大小。充分利用在相同距离上的合成孔径雷达回波具有相同的时间延迟量，在相同方位向的回波具有相同的相位项这一重要结论，对算法进行了改进。提出一种产生虚假图像目标信号的快速算法，满足了产生虚假图像回波信号实时性的要求。最后，仿真结果证明了干扰算法的有效性。

Study of a method on creating fake image jamming signal fleetly to SAR

Deceptive jamming to SAR(synthetic aperture radar) is an effective jamming method. It is important to produce fake image deceptive jamming signal truly and fleetly. After the analysis of SAR echo features of single point target, it is pointed out that deceptive target can be produced in certain position by making a delay transaction and phase compensation to the signals which are received by the jammer. Based on the positions relationship between the jammer and deceptive targets, the time-lapse quantity and phases compensation needed are computed. The algorithm is improved by making full use of the reasons that the time-lapse quantities at the same distance are same and the phases at the same azimuth are same too. A new method is put forward on creating fake image jamming signal fleetly, meeting the need to create the fake image echo signal real-time. Finally, the correction of the method is proved by the simulations.