一种多普勒域走动校正的斜视SAR成像算法

发布时间：2018-04-18 00:06

本文选题：合成孔径雷达(SAR) + 线性调频变标　；参考：《宇航学报》2016年01期

【摘要】：为了解决时域校正走动带来的方位空变性问题,提出了一种在方位多普勒域走动校正的斜视合成孔径雷达(SAR)成像算法。文中利用级数反演理论,将斜距公式展开至三次项,推导出SAR回波信号的两维频谱表达式。再从两维频谱出发,提出了基于两维频谱匹配滤波的斜视SAR成像算法。该算法考虑到距离空变性问题,提出先在两维频域进行走动校正和相位预滤波,接着在距离多普勒域进行线性频率变标的处理方法,经过距离脉压和方位脉压能够得到聚焦良好的SAR图像。此外,该方法与距离徙动(RMA)算法相比可以有效地降低需要处理的数据量。最后,临近空间SAR仿真实验证明本文提出方法的可行性和有效性。
[Abstract]:In order to solve the azimuth spatial variability problem caused by time domain correction walk, a strabismus synthetic aperture radar (SAR) imaging algorithm for azimuth Doppler domain migration correction is proposed.In this paper, by using the series inversion theory, the oblique distance formula is expanded to the cubic term, and the two-dimensional spectrum expression of the SAR echo signal is derived.Based on the two-dimensional spectrum, a squint SAR imaging algorithm based on two-dimensional spectrum matching filtering is proposed.Considering the range space variation problem, the proposed algorithm firstly carries out the walk correction and phase prefiltering in the two dimensional frequency domain, and then carries on the linear frequency variable target processing method in the range Doppler domain.SAR images with good focus can be obtained through range pulse compression and azimuth pulse compression.In addition, compared with the range Migration RMA (RMA) algorithm, the proposed method can effectively reduce the amount of data to be processed.Finally, the simulation results of adjacent space SAR show that the proposed method is feasible and effective.
【作者单位】：西安电子科技大学;中国航天科技集团公司;
【基金】：国家自然科学基金(61403292)
【分类号】：TN957.52

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