自卫干扰位置可控式ISAR假目标合成方法

Synthesis of ISAR decoys with controllable position in Self Screening Jamming

为提高逆合成孔径雷达(ISAR)图像欺骗干扰的逼真度,基于点散射调制模板构建了自卫式干扰(SSJ)条件下位置可控二维假目标干扰信号模型,研究了调制坐标、坐标偏移量以及转速对二维假目标图像合成的影响。理论分析表明,在雷达截获信号的快时间域增加与纵向调制坐标及偏移量对应的时延可以控制假目标的纵向位置;而在慢时间域增加与横向调制坐标及偏移量对应的相位变化因子可控制假目标的横向相对位置;调制转速则使得假目标图像发生横向扩展或压缩。仿真实验结果验证了理论分析的正确性,表明本文位置可控式ISAR假目标干扰信号合成方法有效,且干扰功率要求较低。

In order to improve the reality of false-target image in deception jamming against Inverse Synthetic Aperture Radar(ISAR),the signal modeling of two-dimensional decoys in Self-Screening Jamming(SSJ)scenarios with controllable position is studied based on the modulation template in scattering center model.Firstly,the time delay in the fast time domain corresponding to the longitudinal modulated coordinates and offsets can control the position of the false target in the down range.Secondly,the phase modulating coefficient in the slow time domain corresponding to the transverse modulated coordinates and offsets can control the position in the cross range.Thirdly,the modulated speed would cause horizontal extension or compression of the false-target image.The simulation results verify the correctness of the theoretical analysis and demonstrate the effectiveness of the proposed jamming method,and it also has low power requirement.