中文摘要：

根据天津市12个GPS连续观测站两年的监测资料，探讨利用GPS技术监测天津地区地面沉降的可能性。结果表明GPS处理得到的高程序列比较精确，重复性优于3mm，可以反映监测区内地面沉降的年变化状态，且与水准测量结果保持一致。

英文摘要：

Based on data from 12 continuous GPS stations across Tianjin, the possibility of monitoring the land subsidence with GPS in this area is discussed. Then some strategies are used to produce the height time series and the result indicates that the WRMS of height is better than 3 mm. Through series the height changes during 2006 are presented and the land subsidence considence consists with that with leveling.