An improved imaging algorithm for spaceborne MAPs sliding spotlight SAR with high-resolution wide-swath capability

被引:0
|
作者
Kuang Hui [1 ]
Chen Jie [1 ]
Yang Wei [1 ]
Liu Wei [2 ]
机构
[1] School of Electronic and Information Engineering, Beihang University
[2] Electronic and Electrical Engineering Department, University of Sheffield
基金
中国国家自然科学基金;
关键词
High resolution; Imaging; Multiple-azimuth-phases; Sliding spotlight; Synthetic aperture radar; Wide swath;
D O I
暂无
中图分类号
V443 [电子设备]; TN957.52 [数据、图像处理及录取];
学科分类号
08 ; 080904 ; 0810 ; 081001 ; 081002 ; 081105 ; 0825 ;
摘要
Conventional synthetic aperture radar(SAR) systems cannot achieve both highresolution and wide-swath imaging simultaneously.This problem can be mitigated by employing multiple-azimuth-phases(MAPs) technology for spaceborne sliding spotlight SAR systems.However, traditional imaging algorithms have met challenges to process the data accurately, due to range model error, MAPs data reconstruction problem, high-order cross-coupling phase error and variation of Doppler parameters along the azimuth direction.Therefore, an improved imaging algorithm is proposed for solving the above problems.Firstly, a modified hyperbolic range equation(MHRE) is proposed by introducing a cubic term into the traditional hyperbolic range equation(THRE).And two curved orbit correction methods are derived based on the proposed range model.Then, a MAPs sliding spotlight data reconstruction method is introduced, which solves the spectral aliasing problem by a de-rotation operation.Finally, high-order cross-coupling phases and variation of Doppler parameters are analyzed and the corresponding compensation methods are proposed.Simulation results for point-target scene are provided to verify the effectiveness of the proposed algorithm.
引用
收藏
页码:1178 / 1188
页数:11
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