GNSS基准站网稳定性的误差椭圆法

Error ellipse method for the stability of GNSS continuous operation reference station network

我国大陆地质、地貌复杂,板块运动以及二级板块相对运动频繁,并且长时间受到大气负荷、海潮负荷以及陆地水等非构负荷因素的影响,这些都会对GPS网中测站造成点位移动,即使观测周期间隔为一个月,两期点位位移量有时仍不可忽略。该文以位于四川省的陆态网基准站和四川省CORS站网为例,使用极限误差椭圆方法对站网水平方向进行了位移显著性对比分析,并使用稳定率来表示测站位移程度,从而可直观地识别出稳定点和不稳定点;同时用数理统计的方法分析了测站高程方向的稳定性。为分析网的稳定性提供了理论基础,为挑选稳定站做永久性基准站提供了参考依据。

The changes of the earth rotation, the plates＇ movement and the environment of observa- tion can cause the point shift in the GPS network, even if the observation period is a month, the displace- ment of the two times can not be ignored. In this paper, the limit error ellipse method is used to analyze the horizontal direction of the part of the test station and the CORS network in the province. The stability of the station is directly identified by using the stability ratio. It provides a theoretical basis for the analysis of the stability of the network and a reference basis for the selection of the stability of the station to do a permanent reference station.