基于延迟-移频的SAR有源欺骗干扰有效区域研究

Effective Region of Active Decoy Jamming to SAR Based on Time-delay Doppler-shift Method

基于延迟-移频的SAR有源欺骗干扰方法具有局部区域有效性,有效区域的研究是合理运用干扰、确保达到欺骗效果的基础。该文通过分析干扰信号与真实点目标回波的差异,指出影响干扰信号聚焦的因素为残余距离单元徙动、方位向匹配滤波器失配和多普勒带宽损失,得到了延迟-移频干扰有效区域的解析表达式,并用仿真结果验证了理论分析的正确性。研究表明,基于延迟-移频的SAR有源欺骗干扰适用于干扰机附近小范围区域的防护。

The active decoy jamming to SAR based on the Time-Delay Doppler-Shift （TDDS） method is effective in certain regions. Proper utilization of jamming to ensure good decoy quality requires a study of the effective region. After the mathematical analysis of the difference between the jamming signal and a real point-target echo, the paper points out that residual Range Cell Migration （RCM）, matched filter error, and loss of Doppler bandwidth are three main factors that lead to a deterioration of the focus of a jamming signal. The formulation of the effective regions is obtained and verified by simulation results. The study indicates that the TDDS method can effectively protect limited regions around the jammer.