宽巷组合及轨迹约束下的列车在轨动态单历元定位算法

动态单历元定位的一个关键问题是模糊度的正确解算。通过增加约束条件，可提高单历元解算模糊度的可靠性。当接收机沿线路中线运动时，首先根据接收机的伪距差分位置，计算出其大致里程，进而根据该里程处的线路设计数据构造轨迹约束条件。由于宽巷组合波长较长，其模糊度比较容易确定，通过附加轨迹约束条件的阻尼LAMBDA方法首先固定宽巷模糊度。在宽巷模糊度固定后，再次附加轨迹约束来确定L1、L2模糊度，实验结果表明该算法可获得很高的解算成功率。

Kinematic Single Epoch Positioning Algorithm Based on Wide-Lane Combination and Track Constraints

A key issue of kinematic single epoch positioning is the correct resolution of ambiguity. We can improve the reliability of the single epoch ambiguity resolution by adding constraints. When the receiver moves along a road center line, we can calculate the approximate mileage by pseudorange differential positioning, then construct track constraints according to line design data of the mileage. Wide lane Ambiguity can be determined relatively easily because its wavelength is longer. Firstly, wide lane ambiguity is fixed by additional track constraints damped LAMBDA,then ambiguities of L1 and L2 are determined through additional track constraints again. Experimental results show that the proposed algorithm has a high resolution success rate.