测绘学报 ›› 2019, Vol. 48 ›› Issue (11): 1439-1451.doi: 10.11947/j.AGCS.2019.20180440

• 摄影测量学与遥感 • 上一篇    下一篇

基于几何配准的多模式SAR影像配准及其误差分析

吴文豪1, 张磊2, 李陶3, 龙四春1, 段梦4, 周志伟5, 祝传广1, 蒋廷臣6   

  1. 1. 湖南科技大学煤炭资源清洁利用与矿山环境保护湖南省重点实验室, 湖南 湘潭 411201;
    2. 香港大学建筑学院, 香港;
    3. 武汉大学卫星导航定位技术研究中心, 湖北 武汉 430079;
    4. 中南大学地球科学与信息物理学院, 湖南 长沙 410083;
    5. 中国科学院测量与地球物理研究所, 湖北 武汉 430077;
    6. 江苏海洋大学测绘与海洋信息学院, 江苏 连云港 222005
  • 收稿日期:2018-10-08 修回日期:2019-08-01 出版日期:2019-11-20 发布日期:2019-11-19
  • 通讯作者: 龙四春 E-mail:sclong@hnust.edu.cn
  • 作者简介:吴文豪(1987-),男,博士,讲师,研究方向为合成孔径雷达干涉处理。E-mail:wuwh@whu.edu.cn
  • 基金资助:
    国家自然科学基金(41877283;41474014;41674032;41004003);江苏省科技厅项目(BE2016701)

Coregistration scheme and error analysis of multi-mode SAR image based on geometric coregistration

WU Wenhao1, ZHANG Lei2, LI Tao3, LONG Sichun1, DUAN Meng4, ZHOU Zhiwei5, ZHU Chuanguang1, JIANG Tingchen6   

  1. 1. Hunan Province Key Laboratory of Coal Resources Clean-utilization and Mine Environment Protection, Hunan University of Science and Technology, Xiangtan 411201, China;
    2. Faculty of Architecture, the University of Hong Kong, Hongkong, China;
    3. GNSS Research Center of Wuhan University, Wuhan 430079, China;
    4. School of Geosciences and Info-physics, Central South University, Changsha 410083, China;
    5. Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China;
    6. School of Geomatics and Marine Information, Jiangsu Ocean University, Lianyungang 222005, China
  • Received:2018-10-08 Revised:2019-08-01 Online:2019-11-20 Published:2019-11-19
  • Supported by:
    The National Natural Science Foundation of China (Nos. 41877283;41474014;41674032;41004003);The Project of Jiangsu Province Technology Hall(No. BE2016701)

摘要: 星载合成孔径雷达影像干涉处理时所需方位向配准精度因成像模式的差异而有所不同,目前在精密轨道条件下以几何配准为基础辅以影像信息的配准方案因其严格的理论模型和较高的精度成为干涉处理的首选。本文以TerraSAR-X影像为例,论证了不同成像模式影像所需的配准精度和卫星轨道精度,并通过理论分析和试验证明了精密轨道条件下,利用几何配准即可满足TerraSAR-X等卫星的条带模式影像干涉处理的需要;聚束模式影像需要在几何配准的基础上利用影像相干性或谱分集进一步优化配准结果。鉴于增强谱分集偏移量估计精度最高,本文进一步利用增强谱分集对比分析了不同轨道不同DEM条件下的几何配准误差。研究结果表明:卫星轨道切向误差是几何配准的主要误差源,目前常用3种DEM几何配准差异远小于0.001个像素,均可满足Sentinel-1影像干涉配准的需要。

关键词: InSAR, 几何配准, 精密轨道, 谱分集, 增强谱分集, 聚束模式, TOPS

Abstract: With the development of radar imaging technology and the diversification of imaging modes, the accuracy of coregistration in the direction of azimuth required by SAR interferometry is different. At present, due to the strict theoretical model and the high accuracy, the coregistration scheme with the image information based on geometric coregistration under the condition of precise orbits become the first choice for interference processing. In this paper, TerraSAR-X images have been taken as an example to demonstrate the accuracy of interferometric coregistration and satellite orbit required by different imaging modes. Furthermore, theoretical analysis and experimental validation have also been applied. It is proved that under the condition of precise orbits, SAR interferometric processing of strip-mode image of TerraSAR-X and other satellites can be achieved by geometric registration. While, spotlight imaging mode requires image coherence or spectral diversity to further optimization of the geometric coregistration results. Since the ESD (Enhanced Spectral Diversity) offset estimation method offers the highest accuracy. It has been used to estimate the geometric coregistration errors of Sentinel-1 satellite images with different orbit and DEM conditions. The results suggest that geometric coregistration error is mainly caused by the tangential error of the satellite orbit, and the difference of geometric corregistration of three kinds of DEM is much less than 0.001 pixels, which can meet the needs of Sentinel-1 image interference registration.

Key words: interferometric synthetic aperture radar, geometrical coregistration, precise orbit, spectral diversity, enhanced spectral diversity, spotlight mode, terrain observation by progressive scans

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