改进小基线集时序雷达方法监测显著地表沉降

摘要

针对现有时序雷达干涉测量在监测时间跨度过大的条件下存在的问题，该文依据结合时序先验约束值辅助构建线性时序模型的总体思路推导并实现了改进的小基线集时序差分干涉分析模型。为验证模型与算法的可行性，实验选取23幅 L 波段 ALOS／PALSAR 影像数据，针对河北胜芳镇2007年到2010年的不均匀地表沉降开展量化分析，获得了整体区域雷达视线方向地表累积沉降量，标定了沉降漏斗位置并对累积沉降量进行了评估。%In order to decrease the negative effects of large time span to temporal synthetic aperture radar interferometry,the methodology of new small baseline subset (N-SBAS)was derived and implemented through constructing linear temporal model with prior constraint values.For validation purpose,Shengfang town in Hebei province was selected as the study area,and the experiment was performed by using 23 ALOS/PALSAR L-band SAR images acquired from 2007 to 2010.The statistical result indicates that N-SBAS approach is feasible and effective.Besides,further analyses also reveal the location and the cumulative revolutionary trend of the subsidence funnels.