板块运动模型对跟踪站坐标时序解算影响分析

Analysis of influence of plate motion model on coordinate time series calculation of tracking station

针对目前常用站点坐标时序来反演板块运动趋势,却很少意识到板块运动也是引起站点坐标变化主要因素的问题,提出一种利用板块运动模型改正测站坐标时序解算精度的思路。以斯克里普斯轨道和永久阵列中心(SOPAC)网站提供的2017—2019年共3a的全球单日松弛解H文件作为原始数据,选择北美(NOAM)、欧亚(EURA)、澳大利亚(AUST)、南美(SOAM)4个板块为研究区域。实验结果表明,顾及站点距离板块边界的有效距离,施加板块运动模型后,能有效提升站点水平方向坐标时间序列的精度,各板块内平均精度提升率都能达到60%以上,同时验证了模型在站点水平速度场解算中的可用性。

In view of the fact that the station coordinate time series are commonly used to invert the trend of plate motion, it is seldom realized that the plate motion is also the main factor causing the station coordinate change, this paper proposes an idea of using the plate motion model to correct the accuracy of the station coordinate time series. The global one-day relaxation solution H file of three years from 2017 to 2019 produced by Scripps Orbit and Permanent Array Center(SOPAC) website is taken as the original data, the North American(NOAM), Eurasian(EURA), Australian(AUST) and South American(SOAM) plates are selected as the research areas. The experimental results show that, applying the plate motion model can effectively improve the accuracy of the station horizontal coordinate time series, and the average accuracy improvement rate of each plate can reach more than 60%, at the same time, the availability of the model in the station horizontal velocity field calculation is verified.