大气负荷变化对CORS位置影响分析与其移除研究

利用全球大气模型和CORS位置时间序列数据，基于负荷形变理论，采用球谐系数法计算大气负荷变化对CORS位置地壳形变的影响。结果显示，对研究区CORS位置垂直方向影响为-15.9~13.2 mm，水平形变影响为0~2.7 mm。根据移除大气负荷对CORS影响前后序列的RMS值变化可知，移除大气负荷影响对CORS时间序列水平方向改善较小，垂直方向改善明显；根据最小二乘方法计算研究区大气负荷变化对地壳垂直方向的形变导纳值（回归系数）为-0.7~-0.43 mm/hPa。本文研究方法和成果对分离修正CORS中大气负荷影响具有借鉴意义。

Influence Analysis of Atmospheric Load Change on Position of CORS and Its Removal Study

Based on the global atmospheric model and the time series data of CORS location, we calculate the influence of atmospheric load on the crustal deformation at CORS locations using the spherical harmonic coefficient method. The results show that the influence of atmospheric load on the vertical direction of CORS location in the study area is -15.9 to 13.2 mm, and the influence on horizontal deformation is 0 to 2.7 mm. According to the change of RMS value before and after removing the influence of atmospheric load on CORS, it is concluded that removing the influence of atmospheric load on the horizontal direction of CORS time series has little improvement, but has obvious improvement on the vertical direction. According to the least square method, the crustal vertical deformation admittance(regression coefficient) of the study area varies from -0.75 to -0.43 mm/hPa. The research methods and results of this paper can be used for reference in the separation and correction of atmospheric load in CORS.