An improved imaging algorithm for spaceborne MAPs sliding spotlight SAR with high-resolution wide-swath capability
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 me...
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| Published in | Chinese journal of aeronautics Vol. 28; no. 4; pp. 1178 - 1188 |
|---|---|
| Main Authors | , , , |
| Format | Journal Article |
| Language | English |
| Published |
Elsevier Ltd
01.08.2015
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1000-9361 2588-9230 |
| DOI | 10.1016/j.cja.2015.06.009 |
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| Abstract | 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. |
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| AbstractList | 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. Conventional synthetic aperture radar (SAR) systems cannot achieve both high-resolution 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. |
| Author | Kuang Hui Chen Jie Yang Wei Liu Wei |
| AuthorAffiliation | School of Electronic and Information Engineering,Beihang University,Beijing 100191,China Electronic and Electrical Engineering Department,University of Sheffield,Sheffield S1 3JD,UK |
| Author_xml | – sequence: 1 givenname: Hui surname: Kuang fullname: Kuang, Hui organization: School of Electronic and Information Engineering, Beihang University, Beijing 100191, China – sequence: 2 givenname: Jie surname: Chen fullname: Chen, Jie organization: School of Electronic and Information Engineering, Beihang University, Beijing 100191, China – sequence: 3 givenname: Wei surname: Yang fullname: Yang, Wei email: yangweigigi@sina.com organization: School of Electronic and Information Engineering, Beihang University, Beijing 100191, China – sequence: 4 givenname: Wei surname: Liu fullname: Liu, Wei organization: Electronic and Electrical Engineering Department, University of Sheffield, Sheffield S1 3JD, UK |
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| Keywords | Multiple-azimuth-phases High resolution Wide swath Imaging Synthetic aperture radar Sliding spotlight |
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| Notes | 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. 11-1732/V High resolution;Imaging;Multiple-azimuth-phasesSliding spotlight;Synthetic aperture radarWide swath |
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| Snippet | Conventional synthetic aperture radar（SAR） systems cannot achieve both highresolution and wide-swath imaging simultaneously.This problem can be mitigated by... Conventional synthetic aperture radar (SAR) systems cannot achieve both high-resolution and wide-swath imaging simultaneously. This problem can be mitigated by... |
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| SubjectTerms | High resolution Imaging Multiple-azimuth-phases SAR系统 Sliding spotlight Synthetic aperture radar Wide swath 地图 宽测绘带 成像算法 星载 滑动 聚束SAR 高分辨率 |
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| Title | An improved imaging algorithm for spaceborne MAPs sliding spotlight SAR with high-resolution wide-swath capability |
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