小区域GPS网GAMIT解算结果与IGS站选取的关系

Relationship between GAMIT processing results of small GPS regional net and determination of IGS stations

在江苏省全球导航卫星连续运行参考站综合服务系统（JSCORS）网中选择5个站点组成一个小区域全球定位系统（GPS）网,利用GAMIT软件解算2008年年积日为第196~202日的数据,分析在解算过程中选取全球定位系统服务（IGS）基准站南北半球分布、数量分布（0~10个）对解算结果精度的影响.结果表明,使用GAMIT软件处理该类小区域GPS网观测数据时,最好选取IGS站提供参考框架,但可不必选择位于南半球的IGS站;选取的IGS站空间分布要尽量均匀,数量上选取6~7个即可.

A small global positioning system（GPS） net was composed of 5 stations in Jiangsu continuously operating reference stations（JSCORS） network,then GAMIT software was used to process their data from the 196th annual day to the 202th of 2008.The effect of international GPS service（IGS） station number（0-10） and their distribution on solution accuracy was discussed,and some conclusions were offered.The results showed that,for this small GPS regional net,it was better to choose IGS station to provide a reference frameworked when using GAMIT software dealed with observational data.But there is no necessary to choose the IGS stations located in the southern hemisphere.The selected IGS stations had to be distributed as even as possible,the 6-7 of them are satisfied.