A Weighted Backprojection Algorithm for Azimuth Multichannel SAR Imaging
A Weighted Backprojection Algorithm for Azimuth Multichannel SAR Imaging
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DOI：
10.1109/lgrs.2016.2580907
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发表时间：
2016-06
影响因子：
4.8
通讯作者：
Jiangwen Tang;Yunkai Deng;Robert Wang;Shuo Zhao;Ning Li;Wei Wang
中科院分区：
文献类型：
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作者：
Jiangwen Tang;Yunkai Deng;Robert Wang;Shuo Zhao;Ning Li;Wei Wang
反投影算法（BPA）是一种时域合成孔径雷达（SAR）成像算法，可以不加修改地广泛应用于条带、聚束、滑动聚束等多种成像模式。然而，由于脉冲重复频率的非理想性，BPA在方位向多通道SAR中也存在采样不均匀的问题。在这封信中，我们提出了一个加权BPA（WBPA）的方位多通道SAR成像。WBPA是在基于滤波器组的重建方法的基础上，增加了一个加权过程。仿真和机载SAR数据实验表明，WBPA能在频带受限的情况下较好地抑制方位模糊。WBPA扩展了BPA的适用范围。
A backprojection algorithm (BPA), a time domain synthetic aperture radar (SAR) imaging algorithm, can be widely used without modification in various imaging modes, like stripmap, spotlight, sliding spotlight, etc. However, BPA also suffers when used in azimuth multichannel SAR due to the nonuniform sampling problem caused by a nonideal pulse repetition frequency. In this letter, we propose a weighted BPA (WBPA) for azimuth multichannel SAR imaging. Derived from the filter-bank-based reconstruction method, WBPA adds a weighting procedure to BPA. Simulations and an airborne SAR data experiment demonstrate that WBPA can perfectly suppress the azimuth ambiguities under band-limited circumstances. WBPA extends the applicable scope of BPA.