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中文摘要：
地面沉降尤其是不均匀地面沉降对高速铁路运营安全具有重要影响，该文利用永久散射体干涉测量（PS-In—sAR）技术及小波变换提取京津高铁北京段沿线的不均匀沉降信息，得到以下结论：1）北京平原地面沉降主要发生在昌平、顺义、朝阳及通州，最大地面沉降速度-30．64mm／a，其中朝阳区和通州区的不均匀沉降最为严重；2）京津高铁北京段存在3个主要的不均匀沉降段，其长度分别为18．84km、11．06km、3．6km，不均匀沉降段占该线路总长度的62．97％。研究表明，PS-InSAR方法可以获取区域地面沉降的空间分布趋势，小波变换可以有效去除数据噪声，从而利于铁路沿线不均匀沉降信息的提取。
英文摘要：
Land subsidence especially uneven land subsidence has an important influence to the high-speed railway. In this paper, PS-InSAR technology was used to obtain the spatial character of the land subsidence in Beijing plain. On the basis, using the wavelet transformation to remove the noise included the land subsidence data of the Beijing-Tianjin high-speed railway within Beijing,and taking the wavelet reconstruction to construct the data whose noise has been removed. Some important conclusions were acquired as follows： 1） Land subsidence phenomenon appeared mostly in Changping, Shunyi, Chaoyang and Tongzhou, the maximum land subsidence rate was -30.64 mm/a, the uneven land subsidence was serious in Chaoyang and Tongzhou which contained the high-speed railway. 2） Three uneven land subsidence sections can be recognized along the railway, the length was 18.84 km, 11.06 km and 3.6 km separately,the length occupied 62. 97% of the total length. This research showed that the PS- InSAR could extract the land subsidence information and the wavelet transformation could remove the noise within the data, with these ways, the uneven land subsidence information could be retried more conveniently.
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