一种基于图像域相位误差估计的圆迹SAR聚焦算法

郭振宇; 林赟; 洪文

doi:10.12000/JR15046

一种基于图像域相位误差估计的圆迹SAR聚焦算法

doi: 10.12000/JR15046

1.
(中国科学院电子学研究所北京 100190)
2.
(微波成像技术国家重点实验室北京 100190)
3.
(中国科学院大学北京 100049)

基金项目:

国家自然科学基金重点项目(61431018)和国家自然科学基金青年基金(61201404)资助课题

详细信息

作者简介:
郭振宇(1988-),男,江苏无锡人,中国科学院电子学研究所博士,主要研究方向为高分辨率机载圆迹SAR信号处理与成像算法、运动补偿方法。E-mail:ggfuji@gmail.com;林赟(1983-),女,浙江人,2011年获得中国科学院电子学研究所博士学位,中国科学院电子学研究所助理研究员。研究方向为合成孔径雷达3维成像技术、多角度SAR成像基础理论与方法研究。E-mail:ylin@mail.ie.ac.cn;洪文(1968-),女,上海人,1997年获得北京航空航天大学博士学位,现任职于中国科学院电子学研究所,研究员,研究方向为合成孔径雷达成像与系统及其应用、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

通讯作者:
郭振宇

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- 被引次数: 0
出版历程
- 收稿日期: 2015-04-20
- 修回日期: 2015-06-29
- 网络出版日期: 2015-12-28

A Focusing Algorithm for Circular SAR Based on Phase Error Estimation in Image Domain

1.
(Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China)
2.
(National Key Laboratory of Microwave Imaging Technology, Beijing 100190, China)
3.
(University of Chinese Academy of Sciences, Beijing 100049, China)

Funds:

The National Natural Science Foundation of China (61431018, 61201404)

摘要

摘要: 残余运动误差是影响高分辨率圆迹SAR图像获取的首要原因。该文针对回波数据域信杂比较低、相位误差跨距离分辨单元的问题, 提出了一种基于图像域估计相位误差的圆迹SAR聚焦算法。该方法首先对强点目标图像进行加窗截取, 然后从图像中重建回波估计方位向的相位误差, 计算距离向徙动误差, 最后通过对回波数据补偿相位误差完成跨距离分辨单元的徙动矫正和方位向聚焦, 获取高质量的圆迹SAR图像。仿真和实际数据处理结果验证了该方法的正确性和有效性。
- 合成孔径雷达(SAR) /
- 圆迹合成孔径雷达(CSAR) /
- 运动补偿 /
- 回波重建 /
- 相位梯度
Abstract: Residual motion error is common in high-resolution circular Synthetic Aperture Radar (SAR) image defocusing. The Signal-to-Clutter Ratio (SCR) in echo data domain is relatively low; thus, the phase error spans several range bins. To solve this problem, we propose a focusing algorithm for circular SAR based on phase-error estimation in the image domain. The method estimates the point-target image window interception and then the phase error from echo regeneration in the defocused image. Subsequently, the range migration error is calculated, and finally, the phase error in the echo data is compensated for azimuth focusing and range cell migration correction. Simulation and real-data processing verified the proposed method.
- Synthetic Aperture Radar (SAR) /
- Circular SAR (CSAR) /
- Motion compensation /
- Echo regeneration /
- Phase gradient

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参考文献(16)

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