GPS坐标时间序列中地表环境负载效应区域特征分析

选取全球417个IGS测站2000~2012年环境负载数据分析非潮汐海洋、大气、积雪和土壤湿度等负载对GPS测站时间序列位移的影响以及与测站地理位置之间的联系。研究表明，大气压力对GPS时间序列位移的影响最大，U方向最大达到20 mm，积雪负载的影响最小。4种负载对GPS时间序列高程方向的影响可达cm级，且大气及非潮汐海洋负载呈现显著的区域性特征。

Analysis of Regional Characteristics of Environment Load Effect in GPS Coordinate Time Series

Environmental loading effects have spatial differences, in order to provide the basis for subsequent loading data selection to correct reference station coordinate time series. In this paper, we calculate 4 different kinds of environmental loadings (atmosphere pressure, non-tidal ocean, snow pressure and soil moisture displacement time series) that are related to 417 global IGS stations. Referring to the analysis of these data, this article discusses the relationship between the same kind of load displacement of global IGS stations and geographical position. The result shows that the effect of atmospheric pressure on the GPS time series displacement is maximum; the displacement of U direction can reach 20 mm. The effect of snow loading on the GPS time series displacement is minimal. Effects of four environmental loadings on GPS time series in elevation direction can reach the centimeter level. Furthermore, non-tidal ocean and atmospheric loading shows significant regional characteristics.