垂向GPS坐标序列中质量负荷形变改正

Mass Loading Deformation Corrections in Vertical GPS Coordinate Time Series

垂向GPS坐标时间序列中有明显的周期性变化特征,这种周期变化主要是由地表质量负荷变化引起的。以陆态网中15个GPS基准站站点为例,分析了大气负荷、土壤水负荷引起的形变位移的影响。经过大气和土壤水负荷形变改正后,各站点坐标序列年周期项振幅平均减少50.5%,序列平均RMS值改善率为18%,这表明对垂向GPS坐标序列进行质量负荷改正在一定程度上能够改善垂向GPS坐标数据质量。

There exist obvious periodic variations in vertical GPS coordinate time series,which are thought to be mainly caused by mass loading changes on earth’s surface.We take 15 GPS sites in the Crustal Movement Observation Network of China as examples,to analyze the effects of deformations of atmospheric loading,and soil moisture loading.After the correction of different mass loading displacements,the annual amplitude of the three GPS sites decrease 50.5%,and the RMS improvement rates of the series can be reach 18%,which means making mass loading correction can improve the quality of the vertical GPS time series.