基于TDOA的列车无线定位方法研究

针对目前铁路列车定位普遍存在的只能点式定位、精度不高、大量设立轨旁设备等问题,结合时差定位法(TDOA)定位精度高、抗多径能力强等特点,提出一种基于TDOA的三基站列车无线定位方法。建立列车位置与基站间距离的非线性方程并利用牛顿迭代法求解。仿真结果表明,该定位方法能满足列车定位的需求,牛顿迭代法对误差较大的定位点优化效果明显,较之经典的CHAN算法有更高的定位精度。此外,无线定位方法可提高运营效率、降低运行成本,是一种比较有效的列车定位方法,可为列车定位提供有益的参考。

Study on TDOA-based Wireless Train Positioning Method

With respect to prevalent such drawbacks in the current train positioning as inability to provide continuous real-time positioning information,low positioning accuracy and excessive trackside equipment,a TDOA-based three-base station wireless train positioning is proposed in the light of the high positioning accuracy and the strong anti-multipath of TDOA. The nonlinear equation on the distance between trains and base stations is established to solve it with Newton iteration method. Simulation results show that this approach can satisfy the demand of train positioning,Newton iteration method has obvious optimization effect on big error positioning point and higher positioning precision compared with the classic CHAN algorithm. Besides,wireless train positioning approach is an effective positioning method to improve operational efficiency,reduce operation cost and provide references for train positioning.