基于波数域子孔径的机载三维SAR偏航角运动误差补偿

丁振宇; 谭维贤; 王彦平; 洪文; 吴一戎

doi:10.12000/JR15016

基于波数域子孔径的机载三维SAR偏航角运动误差补偿

doi: 10.12000/JR15016

1.
中国科学院电子学研究所北京 100190;
2.
微波成像技术重点实验室北京 100190;
3.
中国科学院大学北京 100190;
4.
内蒙古工业大学信息工程学院呼和浩特 010051;
5.
⑤ 中国安全生产科学研究院北京 100012

基金项目:

国家自然科学基金(61372186)资助课题

详细信息

作者简介:
丁振宇(1987-),男,籍贯浙江,2010年毕业于北京理工大学,获得学士学位,现在中国科学院大学攻读博士学位。研究方向为合成孔径雷达三维成像理论、成像算法、补偿处理。E-mail:dingzhenyusky@sina.cn;王彦平(1976-),男,籍贯山东,2004年毕业于中国科学院电子学研究所,获得工学博士学位,现为中国安全生产科学研究院研究员。研究方向为极化干涉SAR数据处理、合成孔径雷达3维成像体制等。E-mail:jwkj2012@189.cn;洪文(1968-),女,籍贯上海,1997年毕业于北京航空航天大学,获工学博士学位,现为中国科学院电子学研究所研究员。研究方向为极化/极化干涉合成孔径雷达数据处理及应用、3维微波成像新概念新体制新方法等。E-mail:whong@mail.ie.ac.cn;吴一戎(1963-),男,籍贯安徽,中国科学院院士,研究员,博士生导师,中国科学院电子学研究所所长。研究方向为高分辨率和干涉SAR系统技术、遥感卫星地面处理与应用系统技术等。E-mail:wyr@mail.ie.ac.cn

通讯作者:
丁振宇

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出版历程
- 收稿日期: 2015-01-26
- 修回日期: 2015-03-13
- 网络出版日期: 2015-08-28

Yaw Angle Error Compensation for Airborne 3-D SAR Based on Wavenumber-domain Subblock

1.
① Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China;
2.
Key Laboratory of Science and Technology on Microwave Imaging, Beijing 100190, China;
3.
③ University of Chinese Academy of Sciences, Beijing 100190, China;
4.
College of Information Engineering, Inner Mongolia University of Technology, Hohhot 010051, China;
5.
⑤ China Academy of Safety Science and Technology, Beijing 100012, China

摘要

摘要: 机载3维SAR可实现3维成像, 但运动误差会影响成像质量, 其中姿态角误差改变阵元间相对位置, 影响复杂, 目前还没有基于测量数据的补偿方法。该文建立了机载3维SAR成像模型, 分析了姿态角误差对成像的影响, 其中偏航角误差的补偿最为复杂。由回波相位可得航迹向和跨航向波数, 根据这两个波数计算的距离误差与目标位置无关, 消除了误差的空变性。提出在航迹向和跨航向2维波数域分块计算距离误差, 在空域补偿的波数域子孔径补偿方法。仿真结果证明该方法可有效补偿偏航角运动误差的影响。
- 合成孔径雷达(SAR) /
- 阵列天线 /
- 3维成像 /
- 运动补偿 /
- 波数域子孔径
Abstract: Airborne array antenna SAR is used to obtain three-dimensional imaging; however it is impaired by motion errors. In particular, rotation error changes the relative position among the different antenna units and strongly affects the image quality. Unfortunately, the presently available algorithm can not compensate for the rotation error. In this study, an airborne array antenna SAR three-dimensional imaging model is discussed along with the effect of rotation errors, and more specifically, the yaw angle error. The analysis reveals that along- and cross-track wavenumbers can be obtained from the echo phase, and when used to calculate the range error, these wavenumbers lead to a target position irrelevant result that eliminates the error's spatial variance. Therefore, a wavenumber-domain subblock compensation method is proposed by computing the range error in the subblock of the along- and cross-track 2-D wavenumber domain and precisely compensating for the error in the space domain. Simulations show that the algorithm can compensate for the effect of yaw angle error.
- Synthetic Aperture Radar (SAR) /
- Array antenna /
- Three dimensional imaging /
- Motion compensation /
- Wavenumber-domain subblock

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参考文献(16)

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