地球信息科学学报 ›› 2016, Vol. 18 ›› Issue (6): 805-813.doi: 10.3724/SP.J.1047.2016.00805

• 遥感科学与应用技术 • 上一篇    下一篇

InSAR时序分析高相干目标选取方法比较研究

范锐彦1(), 焦健1,*(), 高胜1,2, 曾琪明1   

  1. 1. 北京大学遥感与地理信息系统研究所,北京 100871
    2. 中国科学院电子学研究所,北京 100190
  • 收稿日期:2015-12-07 修回日期:2016-01-15 出版日期:2016-06-10 发布日期:2016-06-10
  • 通讯作者: 焦健 E-mail:ryfan_pku@163.com;jiaojian@pku.edu.cn
  • 作者简介:

    作者简介:范锐彦(1990-),女,硕士生,研究方向为InSAR时序分析应用。E-mail: ryfan_pku@163.com

  • 基金资助:
    国家自然科学基金项目(41571337)

Comparison Research of High Coherent Target Selection Based on InSAR Time Series Analysis

FAN Ruiyan1(), JIAO Jian1,*(), GAO Sheng1,2, ZENG Qiming1   

  1. 1. Institute of Remote Sensing and GIS, Peking university, Beijing 100871, China
    2. Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2015-12-07 Revised:2016-01-15 Online:2016-06-10 Published:2016-06-10
  • Contact: JIAO Jian E-mail:ryfan_pku@163.com;jiaojian@pku.edu.cn

摘要:

合成孔径雷达干涉测量(Interferometric Synthetic Aperture Radar,InSAR)时序分析技术,利用时域上多幅SAR图像选择时间基线、空间基线满足一定条件的干涉对进行干涉,通过建立干涉相位形变模型获取地表形变信息。InSAR时序分析技术改善了差分干涉测量中时空失相干、大气延迟等问题,广泛应用于有关形变监测的多个领域,并逐渐成为获取长期地表形变趋势的重要手段。在InSAR时序分析中,针对不同应用选取合适的高相干目标选取方法,获得可靠的高相干目标,是获取精确可靠的地表形变信息的基础。本文通过分析永久散射体(Permanent Scatterers,PS)、分布式散射体(Distributed Scatterers,DS)选取方法的理论模型及其算法,研究其适用地物目标类型的异同,并分析、归纳总结了幅度相关法、相位分析法、信号杂波比法、相干性统计法等不同的高相干目标选取方法的优缺点。最后,以阿尔金断裂带西段部分区域为研究区,分别采用具有代表性的PS、DS选取方法开展该研究区域的选点实验,结果表明该研究区域DS选取方法比PS选取方法适用。本文方法为解决在不同地理区域进行应用研究时选取合适的选点方法提供参考。

关键词: InSAR时序分析, PS, DS

Abstract:

Synthetic Aperture Radar Interferometry (InSAR) time series analysis technique gradually becomes an important approach to obtain the long-term trend of surface deformation. It chooses a series of SAR images and establishes the corresponding model to extract the surface deformation. Currently, the InSAR time analysis technique is capable to improve the decorrelation and atmospheric delay in InSAR, therefore it has been widely used in many fields, including the urban ground deformation caused by the exploitation of underground resources, the mining field surface deformation caused by exploitation of mineral and natural gas, and the natural surface deformation caused by earthquake, volcano or landslide. Among different practical cases, selecting an appropriate method to capture the high coherent target is the fundamental step in getting the accurate and reliable surface deformation information. In this paper, we analyze the theoretical models of Permanent Scatterers (PS) and Distributed Scatterers (DS) and the differences of characteristics between the PS and DS point types. And we summarize the advantages and disadvantages of different high coherent target selection methods from the perspectives of SAR echo signal and InSAR time series analysis. Dispersion of amplitude is the most widely used method and the phase analysis method is more suitable for further selecting the points of PS. For the method of signal-to-clutter ratio, it is more applicable to select the PS candidates. The correlation coefficient method is only adaptive to a few SAR data. And for DS selection, the improved average temporal coherence method is more representative than the dispersion of amplitude difference method and the average temporal coherence method. In addition, this paper chooses some of the western part of Altyn Tagh Fault as the study area. And we verify the feasibility of the typical PS and DS selection methods to the real surface of the study area. The experimental results show that the DS method is more applicable than the PS method in non-urban area, and we obtain the deformation rate of Altyn Tagh Fault as well. Through these analyses, we provide the theory basis for selecting the appropriate methods in different research applications within different geographical areas.

Key words: InSAR time-series analysis, PS, DS