中文摘要：

利用差分干涉测量短基线集时序分析方法，基于ENVISATSAR数据，研究了2003～2010年期间的北京地区主要地面沉降区域的空间分布特征。对两个相邻轨道的结果进行对比验证，相关性达到了0．87，RMS为4．9mm／a，显示了结果的可靠性。InSAR时序分析结果发现，2003～2010年期间，北京的主要沉降区域在快速沉降，而且呈加速趋势。朝阳区和通州的部分沉降中心在2007～2010年期间年平均沉降速率达到了100mm／a。

英文摘要：

To investigate land subsidence in Beijing city and its surrounding region, cent descending tracks of Envisat images collected during the period from 2003 to two 2010 adia- were interferometrically processed and a time series analysis was applied to their small baseline in- terferograms to recover displacement evolution. A high correlation coefficient, 0. 87, was observed between two mean velocity maps from the adjacent tracks. The small RMS differ- ence, 4. 9 mm/yr~ provides strong supporting evidence for the InSAR time series results. Our findings suggest that Beijing city exhibited rapid subsidence in several key subsidence ar- eas during 2003 and 2010 with an accelerating trend, especially during the period of 2007 to 2010. During this period, the maximum subsidence rate rose to 100 mm/a in some subsid- ence areas around Chaoyang and Tongzhou.