测站数目和观测弧段对GPS解算地球自转参数的影响分析

应用GPS技术解算ERP参数时，其精度受到测站的选取、网形结构等因素的影响。针对该问题，利用全球IGS站的GPS数据并采用控制变量法，依次分析了不同测站数目、不同观测弧段长度等因素对解算ERP参数的影响。研究发现，这两种因素对解算ERP参数有较大影响，应当根据不同的测站数目选取相应的观测弧段长度，才能达到最佳的解算效率和解算精度。

Analysis of the Influence of Number of Station and Observation Arcs to Earth Rotation Parameters by GPS

The accuracy of ERP solved by GPS technology is influenced by the selection of the station, the structure of the network and other factors. Accordingly, GPS data from IGS stations is downloaded to calculate ERP with a control variable method in order to analyze the effect of the number of stations and observation arcs on the accuracy of these parameters. The research shows that these two factors have a great impact on calculating ERP. In order to achieve optimum calculation efficiency and calculation precision, appropriate observation arcs should be selected according to the different station numbers.