快速精密星历替代精密星历定位的初步研究

Preliminary Study on Rapid Ephemeris Replacing the Precise Ephemeris in GPS Locating Calculation

摘要:

由于GPS精密定位所需的IGS精密星历要在两周以后才能得到,因而利用两天后即可得到的快速精密星历、12小时后得到的超快速精密星历代替精密星历是GPS应用于地震短临预测的一个重要条件。本文利用北京市全球定位综合应用服务系统中五个GPS连续观测站一年半的数据,分别用三种星历进行精密定位计算,得到了小规模网中快速精密星历一般可以代替精密星历进行精密定位计算的结果。

Abstract:

As the IGS precise ephemeris which is used in GPS precise positioning （for example, in GAMIT software） can only be available in two weeks later, it is an important condition for using GPS data in the earthquake short-term prediction that taking the IGS rapid ephemeris which can arrives in two days and the IGS ultrarapid ephemeris which can be obtained in 12 hours, both with as nearly same preciseness as the precise ephemeris with, to replace the IGS precise ephemeris. In this paper, based on the observation data of 5 GPS continuous stations in the global positioning integrated application and services system in Beijing in one and half year, the precise located calculation is done by using three IGS satellite ephemeredes. The conclusion is that IGS rapid ephemeris can commonly replace the IGS precise ephemeris in calculation for small network.