说明：  设计一个机车无线定位管理系统为目的，首先介绍了时下主流无线定位技术，讨论了其在机车定位应用方面的局限性，并在此基础上提出了基于对称双边到达时间测距算法和最小二乘定位算法的车站机车精确定位方法
(Design a locomotive wireless location management system for the purpose of, first introduced the nowadays mainstream wireless location technology, discussed the limitations of the locomotive positioning applications, and on this basis, based on symmetrical bilateral arrival time ranging algorithm and least squares precise positioning of the station locomotive of the positioning algorithm)