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带距离徙动校正的压缩感知PFA成像方法

DOI: 10.11834/jig.20140713

Keywords: 极坐标格式算法(PFA),压缩感知,距离向插值,方位向插值,距离徙动校正

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Abstract:

目的极坐标格式算法(PFA)是合成孔径雷达(SAR)聚束模式下的一种高分辨率成像算法,方位向增加孔径长度带来了数据存储和传输的负担,利用压缩感知进行合成孔径雷达成像可以减小采样率,以前的研究往往认为图像是2维可分离的而忽略距离徙动的影响,造成了图像质量的下降。提出一种在方位向利用压缩感知处理的PFA成像算法,可以校正距离徙动,保证压缩感知成像的图像分辨率。方法在方位向进行压缩感知处理的过程时,采用了随距离空间频率变化的傅里叶基。结果该方法可以有效代替PFA处理过程中的方位向插值,消除距离徙动的影响,保证距离向和方位向的分辨率。结论仿真和实测数据的处理结果证明了该方法的有效性。

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