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电子学报  2014 

基于椭圆极坐标的一站固定式双基地低频UWBSARFFBP成像处理

DOI: 10.3969/j.iss.0372-2012-2014.03.007, PP. 462-468

Keywords: 一站固定式双基地合成孔径雷达,椭圆极坐标,低频,超宽带,快速因式分解后向投影

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Abstract:

一站固定式双基地低频UWBSAR具有方位移变的距离徙动和较长的合成孔径,这导致其距离方位耦合变得非常复杂,从而限制了频域算法的应用.为此,本文提出一种基于椭圆极坐标的一站固定式双基地低频UWBSARFFBP算法.基于一站固定式双基地SAR的成像几何,分别推导了直角坐标与椭圆极坐标下后向投影算法的解析表达式,并讨论了双基地FFBP算法中采用椭圆极坐标的优势.然后分别从频带和斜距误差角度推导了子图像的采样间隔.最后讨论了该算法的实现过程和计算量.仿真结果证明了所提方法的有效性.

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