GPS连续运行参考站网络的解的精度及其稳定性研究

Research on the precision and stability of the solution of GPS cors

利用澳大利亚的维多利亚GPS连续运行参考站网络的原始观测数据、GPS精密数据处理软件和统计分析方法,对GPS网络的解的精度(CORS)及其稳定性与所用的数据量之间的关系进行了深入研究。结果表明:(1)解的精度与数据量之间存在密切的相关关系,其关系可以用非线性回归方程来表示;(2)数据量从1h增加到6h,解的精度随着数据量的增加而迅速提高,而在数据量大于6h以后,提高的速率较为缓慢;(3)对于平均基线长度为数百km、最长的基线边超过1000km的GPS连续运行参考站网络,其在6h以内的解的精度和稳定性不高,不宜用于高精度的测量与定位服务,当数据量达到12h以后,解算结果及其精度趋于稳定,24h解(单日解)具有很高的稳定性,其坐标精度优于5mm;(4)GPS网络的解随着数据量的增加而收敛于单日解。

In this paper, the corelation between the precision of CORS solution and the amount of data used to generate the solution is investigated using the raw observation data of Victorian GPS Continuously Operating Reference Stations Network (Australia),GPS precise data processing software and statistic analysis method. It is demeonstrated that the precision of GPS network solution are strongly related to the amount of data and the corelation can be expressed using non-linear equation. The precision of solutuion is quickly improved along with the increase of amount of data if it is within 6 hours and then the precision of solutuion is very slowly improved when the amount of data is more than 6 hours. When the mean baseline length of a GPS network is a few hundred km and its longest baseline is more than 1000 km, the precisio and stability of less than 6 hours solution are lower and not suitable for high precision measurement and positioning. The solution tends to become stable after the amount of data is more than 12 hours. The stability of 24 hours solution (single day solution) is very high and its precion of coordinate is better than5mm. The results also shows that the solution of GPS network converges at single day solution along with the increase of amout of data.