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宽巷组合及轨迹约束下的列车在轨动态单历元定位算法

王德军1,熊永良2,刘宁1,徐韶光1   

  1. 1. 西南交通大学
    2. 西南交通大学测量工程系
  • 收稿日期:2012-07-19 修回日期:2012-10-24 出版日期:2014-02-20 发布日期:2013-12-19
  • 通讯作者: 王德军
  • 基金资助:

    基于语义层次结构分解的数字地形综合方法研究

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

  • Received:2012-07-19 Revised:2012-10-24 Online:2014-02-20 Published:2013-12-19

摘要:

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。

关键词: 轨迹约束, 单历元, 动态定位, 宽巷组合, 模糊度

Abstract:

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.

Key words: track constraints, single epoch, kinematic positioning, wide-lane combination, ambiguity

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