广州南沙区GPS地面沉降监测数据处理

Land Subsidence Monitoring Using GPS Network in Nansha,Guangzhou

利用广州南沙区GPS地面沉降系统2012-07~2013-12的GPS数据,采用3种不同的基准点方案进行数据处理,计算得到18个月的GPS监测点沉降序列。分析表明,测区位于低纬度地区,电离层活动剧烈,即使基线小于10km,基线长度对单频监测点的解算精度影响仍然较大,而对双频点影响很小;以短基线为原则进行处理后沉降序列RMS为5mm左右,由此计算的沉降速度与水准监测结果基本吻合,但单频监测点的精度还有待提高。

Using three different strategies,we processed the land subsidence monitoring data collected by a mixed set of single-frequency and dual-frequency receivers installed in Nansha,Guangzhou,from July 1,2012 to December 31,2013.The result shows that during maximum solar sunspot cycle periods,ionospheric disturbances corrupted the precision of GPS data processing,even with the baselines less than 10 km.GPS measurement precision shows a standard deviation of about 5 mm,which is quite consistent with leveling results.