基于短基线差分干涉法的上海地面沉降分析

Monitoring Ground Deformation Based on Small Baseline Approach in Shanghai

利用短基线差分干涉时序分析方法获取上海城区的地面形变信息.短基线时序分析方法选择较短的干涉对组合,利用干涉对中的高相干目标的相位和幅度信息在长时间序列中保持稳定的特性,获得高精度的地表形变信息.实验选择上海外环以内的区域,利用2007—2010年间的17景日本ALOS卫星的PALSAR数据,采用短基线时序分析方法提取了相干目标视线向的平均沉降速率.在沉降速率图中,杨浦区与虹口区交界处存在一个明显的漏斗状沉降;闵行区和浦东新区出现了一个较大范围的不规则的沉降条带.

Ground subsidence information is obtained by using small baseline differential SAR interferograms in Shanghai. Amplitude and phase information of some high coherent targets remain stable in a long time sequence, so accurate deformation velocities of these points can be obtained with small baseline method. The area within the outer loop road in Shanghai is chosen for time series analysis of small baseline interferogram. 17 ALOS PALSAR data between 2007 and 2010 are used to extract the LOS average rates of coherent targets. The result shows that there is a clear funnel-shaped settlement in the junction of Hongkou and Yangpu districts, and a wide range irregular settlement in Minhang and Pudong districts.