方位向调制干扰对高分宽幅多通道SAR的影响

Influence of azimuth-modulation jamming on high-resolution wide-swath multi-channel SAR

多通道合成孔径雷达(synthetic aperture radar,SAR)能够利用方位向多通道重构处理去除多普勒模糊,获得高分宽幅SAR图像。针对此特殊的多通道重构处理方式,研究了传统SAR方位向调制干扰对高分宽幅多通道SAR的影响,包括多普勒调制干扰和脉冲延迟转发干扰两种类型的方位向调制干扰方式,为高分宽幅多通道SAR干扰决策提供理论基础。理论分析指出,多普勒调制干扰信号经成像处理后将在方位向生成等间隔分布的虚假目标,并且幅度受与多普勒调制频率相关的正弦函数和匹配滤波损失联合调制;而脉冲延迟转发干扰信号在成像后将只有单个干扰目标出现,且目标的方位位置仅与延迟的脉冲数有关。仿真实验验证了理论分析的正确性。

Multi-channel synthetic aperture radar(SAR)can use azimuthal multi-channel reconstruction processing to resolve the Doppler ambiguities,and obtain high-resolution wide-swath SAR images.Aiming at the special multi-channel reconstruction processing way,the influence of traditional SAR azimuth-modulation jamming on high-resolution wide-swath multi-channel SAR is studied,including Doppler-modulation jamming and pulse-delay-modulation forwarding jamming,to provide a theoretical basis for high-resolution wide-swath multi-channel SAR jamming decision.The theoretical analysis indicates that the Doppler-modulation jamming signal will generate equally-spaced spurious targets in the azimuth after imaging processing,and the amplitudes of the false targets are controlled by the combined sinusoidal function and matched filter loss associated with the Doppler modulation frequency.While the pulse-delay-modulation signal will only generate a jamming target after imaging,the position of the target is only related to the number of delayed pulses.The simulation experi-ments verify the correctness of the theoretical analysis.