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Comparison of RD Algorithm and BP Algorithm Under Severe Range Migration
Author(s): 
Pages: 349-354
Year: Issue:  6
Journal: RADAR SCIENCE AND TECHNOLOGY

Keyword:  距离徙动距离多普勒(RD)算法后向投影(BP)算法插值;
Abstract: 距离多普勒(Range-Doppler,RD)算法是传统窄带/窄波束SAR的经典成像算法,它借助菲涅耳近似,只保留了斜距R(t)的线性部分和二次项.但是当距离徙动严重时,方位向二次以上的高次相位项不能忽略,这会大大降低聚焦精度.后向投影(Back-Projection,BP)算法是一种基于时域处理的成像算法,通过计算双程延时将对应信号进行相干累加,获得高分辨率SAR图像.BP算法由于用时延代替了相位的概念,故与频率无关,不存在距离徙动校正的问题.本文介绍了RD算法和BP算法的原理及算法实现,并且利用距离向插值改进了BP算法.最后,结合计算机仿真结果详细比较了这两种算法的若干性能指标,证明了BP算法比RD算法更适用于大距离徙动情况下的SAR成像.
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