基于平滑样条的PSInSAR大气效应分离研究

发布时间：2018-06-29 15:31

本文选题：PSInSAR + 平滑样条　；参考：《武汉大学学报(信息科学版)》2017年10期

【摘要】：永久散射体技术(permanent scatterers interferometric synthetic aperture radar,PSInSAR)通过提取时间维高相干点,根据各类信息的时空统计特性实现PS(persistent scatterers)点相位分量的分离,获得高精度地表形变监测结果。大气效应作为影响干涉测量精度的最主要误差源,可以通过经典滤波器分别在时间维和空间维滤波处理予以消除。在StaMPS(stanford method for persistent scatterers)技术体系中,大气效应分离时还保有全部的沉降信息。当地表形变速率较大时,大气效应和沉降信息的频谱重合度较高,经典滤波器无法将二者有效分离。通过平滑样条滤波分离大气效应和形变信息,采用广义交叉验证方法获取形变信息的最优估计值,可抗拒解缠错误引起的相位跳变干扰。最后根据模拟数据和ASAR(advanced synthetic aperture radar)数据对比分析高斯滤波和平滑样条滤波分离大气效应的效果,验证平滑样条方法的有效性。
[Abstract]:The permanent scatterer technique, (permanent scatterers interferometric synthetic aperture Radar / PSInSAR, can separate the phase components of PS (persistent scatterers) points according to the temporal and spatial statistical characteristics of various information, and obtain high precision ground deformation monitoring results. The atmospheric effect is the main error source which affects the precision of interferometric measurement. It can be eliminated by classical filter in time and spatial dimension respectively. In StaMPS (stanford method for persistent scatterers) system, all the settlement information is kept when the atmospheric effect is separated. When the local surface deformation rate is large, the spectral coincidence of atmospheric effect and settlement information is high, and the classical filter can not effectively separate them. The atmospheric effect and deformation information are separated by smoothing spline filter, and the optimal estimation of deformation information is obtained by generalized cross validation method, which can resist the phase jump interference caused by unwrapping error. Finally, the effects of Gao Si filtering and smoothing spline filtering on separating atmospheric effects are compared and analyzed according to the simulated data and the ASAR (advanced synthetic aperture radar) data, and the effectiveness of the smoothing spline method is verified.
【作者单位】：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;武汉大学卫星导航定位技术研究中心;
【基金】：国家自然科学基金(41474014,41674032,41274048) 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开放研究基金(E21502)~~
【分类号】：P237

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