Undifferenced Precise Satellite Clock Error Estimation and Precision Analysis

We studied the precise satellites clock error estimation algorithm for navigation satellites.The computation of precise satellites clock error based on the non-difference phase was realized and the results were compared with the products provided by IGS analysis centers.The results show that the post precise satellites clock products calculated by the software are equal to those provided by IGS Final,CODE,JPL and MIT.Their bias are less than 0.1 ns and the precision is equal to the precision of IGS Final.In addition,the real-time precise satellite clock error is also estimated with a high accuracy about 0.1 ns compared with that of CODE.