基于曲面投影的毫米波InSAR数据成像方法

韦顺军; 师君; 张晓玲; 陈刚

doi:10.12000/JR14137

基于曲面投影的毫米波InSAR数据成像方法

doi: 10.12000/JR14137

1.
(电子科技大学电子工程学院成都 611731)
2.
(西安测绘研究所西安 710054)

基金项目:

国家自然科学基金(61101170)，高分专项(GFZX0403060201)和高分专项青年创新基金(GFZX04060103-5-25)资助课题

详细信息

作者简介:
韦顺军(1983-)，男，广西人，获电子科技大学工学博士学位，目前为电子科技大学讲师，主要从事SAR成像技术、干涉SAR技术研究。E-mail:weishunjun@uestc.edu.cn 师君(1979-)，男，河南人，获电子科技大学工学博士学位，目前为电子科技大学副教授，主要从事SAR数据处理方面研究。E-mail:shijun@uestc.edu.cn 张晓玲(1964-)，女，四川人，获电子科技大学工学博士学位，目前为电子科技大学教授/博士生导师，主要从事SAR成像技术、雷达探测技术研究。E-mail:xlzhang@uestc.edu.cn 陈刚(1976-)，男，陕西人，获国防科技大学工学硕士学位，目前为西安测绘研究所副研究员/副主任，主要从事InSAR数据处理、干涉定标技术研究。E-mail:splitter@263.net

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出版历程
- 收稿日期: 2014-11-20
- 修回日期: 2015-02-05
- 网络出版日期: 2015-02-28

Millimeter-wave Interferometric Synthetic Aperture Radar Data Imaging Based on Terrain Surface Projection

1.
(School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China)
2.
(Xi’an Research Institute of Surveying and Mapping, Xi’an 710054, China)

摘要

摘要: 与其它波段相比，毫米波系统具有体积小、重量轻、分辨率高等优点，成为近几年InSAR技术的研究热点。但因其波长短，毫米波InSAR对平台运动轨迹测量精度要求更高，非理想运动情况下传统成像方法数据处理及干涉相位提取困难，另外传统方法基于平面投影成像，在地形陡变时干涉相位缠绕和目标几何畸变较严重。为了解决传统方法在毫米波InSAR成像的以上不足，该文提出了一种基于曲面投影的毫米波InSAR成像方法，将不同通道回波数据投影到相同地形高程曲面上进行成像及干涉相位提取，并推导了曲面下地形高程与干涉相位的关系。仿真和实测数据结果验证了该文方法的有效性，结果显示该方法在平台非理想运动下较传统算法获得更好的InSAR成像和干涉相位质量，且减小了地形高程起伏引起的几何畸变及干涉相位缠绕，更有利于毫米波InSAR图像地形特征描述及高程提取。
- 干涉SAR (InSAR) /
- 毫米波 /
- 曲面投影 /
- 干涉相位 /
- 高度反演
Abstract: Millimeter-wave Interferometric Synthetic Aperture Radar (InSAR) has smaller size, lower weight, and higher resolution compared with other bands. Thus, it has become a hot research topic. However, owing to its shorter wavelength, millimeter-wave InSAR data processing requires high-precision measurements of platform motion. For nonideal trajectories, traditional methods face difficulties in echo imaging and interferogram extraction. In addition, existing methods mainly produce SAR images based on plane projection. When the terrain changes abruptly, these methods may cause strong interferometric phase unwrapping and geometric distortion in SAR images. To overcome the abovementioned disadvantages of conventional methods in millimeter-wave InSAR imaging, an approach based on terrain surface projection is proposed. The echoes of different antennas are projected on the same terrain surface space for data imaging and interferogram extraction. In addition, the relation between terrain elevation and interferometric phase is derived. Simulations and experimental results verify the effectiveness of the proposed method; furthermore, the proposed approach improves the precision of interferometric phase extraction in complex motion conditions, while minimizing geometric distortion and phase wrapping in rough terrain, which is more conducive to terrain description and elevation inversion.
- InSAR /
- Millimeter-wave|Surface projection|Interferometric phase|Elevation inversion /

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参考文献(14)

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