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通过对多输入多输出合成孔径雷达(MIMO-SAR)的虚拟空间采样进行等效观测通道重构,可实现宽测绘带内的多通道合成孔径成像与地面运动目标显示(SAR/GMTI)处理。在建立宽测绘带MIMO-SAR运动目标观测模型的基础上,分析了该模式下MIMO-SAR运动目标回波与传统SAR系统运动目标回波的区别。并利用成对回波原理建立了目标回波的等效微动模型,提出了空间通道重构模式下MIMO-SAR运动目标的等效微动效应,并讨论了运动目标回波的时频谱线数目。最后,数值仿真验证了文中结论的正确性。
Through the reconstruction of the equivalent observation channel in the virtual spatial sampling of MIMO-SAR, multi-channel synthetic aperture imaging and ground moving target display (SAR / GMTI) processing in wide swath can be realized. On the basis of establishing the observing model of MIMO-SAR moving target in wide geodesics, the difference between the moving target echo of MIMO-SAR moving target and that of the traditional SAR system in this mode is analyzed. The equivalent eigenfrequency model of the target echo is established by using the principle of paired echoes. The equivalent micro-effect of the MIMO-SAR moving target in spatial channel reconstruction mode is proposed. The time-frequency spectrum of moving target echo number. Finally, the numerical simulation verifies the correctness of the conclusions in this paper.