CORS的精度及其稳定性研究

Research on the Precision and Stability of the Solution of GPS Cors

GPS连续运行参考站网络(CORS)用于不同的服务对象和目的时,往往对其解算结果的精度及稳定性提出不同的要求.作者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,解的精度与数据量的关系可用非线性回归方程来表示;在6 h以内,解的精度随着数据量的增加而迅速提高;对于平均基线长度超过1 000 km的GPS连续运行参考站网络,在6 h以内解的精度和稳定性不高,当数据量达到12 h后,解算结果及精度趋于稳定,24 h解(单日解)具有很高的稳定性;GPS网络的解随着数据量的增加而收敛于单日解.

The requirements for precision and stability of the solution of CORS are usually different when it is used for different serving object and purpose. In this paper, the corelation between the precision of CORS solution and the amount of data used to generate the solution is investigated by using the original 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 corelation between the precision of GPS network solution and the amount of data can be expressed by 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. When the mean baseline length of a GPS network is more than 1000km, the precision and stability within 6 hours solution is lower. The solution tends to become stable after the amount of data is longer than 12 hours. The stability of 24 hours solution （single day solution） is very high. The results also show that the solution of GPS network converges at single day solution along with the increase of amour of data.