SAR距离卷积方位乘积调制场景欺骗干扰方法

A SAR scene deceptive jamming method based on range convolution and azimuth multiplication modulation

为了降低合成孔径雷达(SAR)场景欺骗干扰实时调制计算量和侦察参数要求,同时兼顾虚假场景的逼真度,首先提出了SAR方位向乘积调制干扰快速实现方法,并通过对SAR传感器到目标点斜距的合理近似,使SAR方位乘积调制干扰能够与SAR距离卷积调制干扰结合用于对SAR的干扰;在此基础上,提出了SAR距离卷积方位乘积调制场景欺骗干扰方法。该方法以欺骗模板的二维傅里叶变换为基础,在干扰前即构建一系列慢时间频域响应函数,并通过方位向实时重采样的方式得到干扰调制信号,在降低侦察参数需求的基础上也能大幅降低计算量,并保持虚假目标的逼真度。同时该方法由于在距离向采用卷积调制,能够对抗复杂波形体制SAR。理论分析和仿真实验验证了文中所提方法的有效性。

To reduce the real-time computational amount and requirement for reconnaissance parameters and main⁃tain the fidelity of false scenes in Synthetic Aperture Radar(SAR)scene deceptive jamming,this paper first proposes a fast implementation method of SAR azimuth multiplication modulation jamming.Through a reasonable approximation of the slant distance from the SAR sensor to the target point,SAR azimuth multiplication modulation jamming is able to be used in combination with SAR range convolution modulation jamming for jamming SAR.On this basis,a SAR scene deceptive jamming method is proposed based on range convolution and azimuth multiplication modulation.Based on the two-dimensional Fourier transform of the spoofing template,this method constructs a series of slow-time frequency domain response functions before jamming,and then obtains the jamming modulated signal by real-time resampling in the azimuth direction,which can significantly reduce the computational effort and the demand for recon⁃naissance parameters,and at the same time maintain the fidelity of the false target.The method is also able to jam the complex waveform SAR due to the use of convolutional modulation in the range direction.Theoretical analysis and simulation experiments verify the effectiveness of the proposed method.