一种GPS整周模糊度单历元解算方法

An algorithm of GPS ambiguity resolution on single-epoch

仅利用单历元的载波相位观测值进行整周模糊度解算,观测方程秩亏,给单历元模糊度解算带来很大困难。因此,本文提出一种单历元确定GPS整周模糊度的方法。利用单历元测码伪距观测值和双频载波相位观测值组成双差观测方程,根据方差矩阵对宽巷模糊度进行分组,采用基于LABMDA方法的逐步解算方法来确定双差相位观测值的宽巷模糊度。确定宽巷模糊度后,可以利用宽巷模糊度值和载波相位观测值,准确解算出L1/L2双差整周模糊度。经试验证明,该方法进行GPS整周模糊度单历元解算具有较高的效率和成功率。

The observation equation is rank defect if only the single-epoch carrier phase observation is used to fix integer ambiguity, it is difficult for ambiguity resolution on single-epoch. Therefore, one method of GPS ambiguity resolution on single-epoch was presented in this paper. Single-epoch data of code pseudorange observations and phase observations were used to form observation equa- tions. The wide-lane ambiguity was divided into groups by variance matrix, then using LAMBDA method to fix wide-lane ambiguity gradually. When wide-lane ambiguity was fixed, the L1/L2 double-difference ambiguity could be resolved precisely by utilizing wide- lane ambiguity and phase observation. The results illuminated that this method could guarantee the high efficiency and success rate of GPS ambiguity resolution on single-epoch.