GPS监测网数据处理方案研究

Study on data processing program for GPS monitoring network

处理大尺度ＧＰＳ监测网多期复测成果的时候，数据处理方案是一个重要问题。作者在处理首都圈ＧＰＳ地形变监测网数据的过程中，经过长期探索和大量试算，提出了制定数据处理方案的基本原则：要采用一个自洽的地球参考框架和常数系统；要采用精度最高的同一种精密星历和相应的地球自转参数；要采用最先进的同一种数据处理软件以及采用同一的参考基准和约束条件。由于地壳处于运动之中，大尺度ＧＰＳ监测网的参考基准应是动态基准。研究表明，选择３个以上观测历史长，具有精确地心坐标和稳定精确位移速率的ＧＰＳ跟踪站组成的参考基准可能是一个最佳选择。首都圈ＧＰＳ地形变监测网在数据处理中采用了最佳的技术方案，获得了高精度的定位结果。

Data processing program is of very importance in processing multiperiod remeasurement data of large scale GPS monitoring network. In processing the data from Capital circle GPS crustal deformation monitoring network, the authors have proposed basic principles for making data processing program through long term explorations and large amounts of calculations. The principles are: Using the selfconsistent earth reference frame and the constant system using the same kind of precise ephemeris with the highest precision and the corresponding parameters of earth rotation, using the most advanced same kind of data processing software and using the same reference datum and constraint conditions. Since the crust is in the state of movement, the reference datum for large scale GPS monitoring network should be a dynamic datum. Our study has indicated that a reference datum consists of more than 3 GPS tracing stations with long observation history, accurate geocentric coordinate, stable and accurate displacement rate might be the best selection. In data processing for Capital circle GPS crustal deformation monitoring network, the best technical program has been used and high precision positioning results have been obtained.