对SAR-GMTI的二维单音调制散射波干扰

针对传统散射波干扰对多通道合成孔径雷达地面动目标指示(synthetic aper ture radar ground moving target indication, SAR-GMTI)成像位置固定、无法掩护特定位置处运动目标的问题,提出了基于二维单音调制的散射波复合干扰方法。该方法将截获到的雷达信号作距离向和方位向的移频调制,对干扰的位置利用线性调频信号的时频耦合特性进行控制,将干扰信号放大后照射到散射目标。从理论上推导出了对SAR-GMTI干扰成像结果的解析表达式,并对干扰性能做了详细分析。理论分析与仿真结果表明,所提方法可有效解决传统散射波干扰无法掩护特定位置处运动目标的问题,实现在固定干扰机下对干扰成像位置的灵活控制,并可通过对散射点的布置控制干扰密集度。即使在较大侦察误差下仍能实现对SAR-GMTI的干扰,对实际工程应用具有一定参考价值。

Scattering-wave jamming against SAR-GMTI based on two dimensional single tune modulation

Considering the problem that the imaging position of synthetic aperture radar ground moving target indication (SAR-GMTI) of the traditional scattering-wave jamming is fixed, which makes the moving targets at specific position exposed, a compound scattering-wave jamming method based on two dimensional single tune modulation is proposed. According to the time-frequency coupling characteristics of linear frequency modulation signal, this method implements the frequency modulation of intercepted SAR signal in both range and azimuth profiles to control the jamming area, and the modulated jamming is amplified and projected to the metal scatterers. The analytical expression of the jamming imaging result against SAR-GMTI is deduced theoretically and the jamming performance is also analyzed in detail. The theoretical analysis and simulation results demonstrate that the proposed method can tackle the problem that the traditional scattering-wave jamming cannot cover the moving target at any position, and realize the flexible control of jamming imaging area by a fixed jammer and the jamming density by deployment of scatters. The SAR-GMTI can still be jammed even under large scouting error, which will provide some reference value for engineering application.