区域GNSS网的整数卫星钟差解算

基于双差模糊度的整数性质，从理论上证明，通过固定基准模糊度可以使整网的星间单差模糊度都恢复整数性质，实现星间单差模糊度固定，从而得到整数卫星钟差。提出模糊度连续弧段的概念，改进基准模糊度选取方法。实验表明，对于1 d弧长的区域观测网数据，与旧方法相比，新方法获得的基准模糊度的数量增加近1倍；基准模糊度固定之后，窄巷模糊度成功固定的比例从60%左右提高到90%左右。将得到的整数卫星钟差用于30 min弧长的快速静态PPP，实现固定解的比例为96.00%。模糊度固定之后，PPP定位N、E、U方向的RMS分别达到7.3 mm、9.8 mm、23.3 mm。

Integer Satellite Clock Estimation with Regional GNSS Network

Based on the integer property of double-difference ambiguity, we prove that the integer property of between-satellite single-difference(BSSD) ambiguities would be invoked once the basis ambiguities are successfully fixed. In order to select a group of independent BSSD ambiguities as a “complete” datum, the concept of ambiguity-continuity-arc is proposed, along with a strategy for selecting basis ambiguities. An experiment is carried out to validate the novel approach. The total number of basis ambiguities is about 2 times that achieved by the old method, resulting in the percentage of fixed BSSD ambiguities improved from about 60% to about 90%, after the basis ambiguities are fixed. The clock products obtained with the proposed approach are validated with rapid static precise point positioning. We show that the percentage of ambiguity-fixed solution is 96.00%, and the RMS in north, east and up directions are 7.3 mm, 9.8 mm and 23.3 mm, respectively.