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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,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。试验结果表明该算法可获得很高的解算成功率。
A key issue of dynamic single epoch positioning is the correct solution of ambiguity. By increasing the constraints, the reliability of ambiguity resolution of single epoch can be improved. When the receiver moves along the line center line, it first calculates its approximate distance based on the receiver’s pseudorange position, and then constructs the trajectory constraints according to the line design data at the distance. As the wide lane combination of longer wavelengths, the ambiguity is relatively easy to determine. With additional trajectory constraints, the wide-area ambiguity is fixed first. After the ambiguity of wide lane is fixed, trajectory constraints are added again to determine L1 and L2 ambiguities. Experimental results show that the algorithm can obtain a high success rate of solution.