机载高分辨率大场景 MIMO-SAR成像算法研究

摘要

机载MIMO-SAR在增大可照射场景范围的同时，也会带来距离空变性问题，使得现有算法在大场景模型下会出现各种误差。基于正侧视大场景模型，对上述问题进行详细的推导分析，指出成像场景测绘带宽变大而导致的失配现象是产生误差的主要因素，并提出了一种机载高分辨率大场景成像算法。理论分析和实验结果验证了该方法的有效性。%The airborne multi-input multi-output synthetic aperture radar ( MIMO-SAR ) may have space-variant range error while enlarging the illuminated area,thus result in various imaging error for the existing algorithms applied to the large scale model .This paper presents a theoretical analysis based on the side-looking model,and the analysis shows that under the widen swath,the mismatch between the echo signal and the reference function is the main factor of the imaging error .So an algorithm of high-precision,large region imaging was proposed,which was verified by the results of simulation .