基于GNSS的列车定位信号完好性提高方法

全球导航卫星系统(GNSS)应用于铁路领域,能够为列车运行控制系统提供实时的位置信息.同时列车定位应当满足一定的安全标准,因此如何提高基于GNSS列车定位的完好性就显得尤为重要.首先,介绍了目前传统的列车定位方式和应用方法;其次,基于D-S证据理论和列车轨道卫星数据库提出了一种新的提高列车定位完好性的方法.最后,通过仿真和实验验证表明:该方法对GNSS在铁路领域的应用具有重要的参考价值.

Integrity enhancement of GNSS for train positioning

Theglobal navigation satellite systems (GNSS)canbe applied inrailwayfieldtoprovidereal-time location informationfor the trainrunning control system, which requires thatthe train localizationfunction comply withcertainsafety standards.Therefore, it is important to improve the integrity of GNSS to ensure the safety of train location information. First, someprinciples of train localization are comparedfor the understandingthe proposed solutions. Second,anew method for improvingtheintegritymonitoringof GNSS intrain positioning is described, whichcompromisestheDempster-Shafer(D-S)evidence theorywith thetrain track satellites database.The D-S evidence theory is applied to the information processing of satellite navigation message,and the train location information was predicted by satellite ephemeris information.Finally, the integritymonitoringoftheproposed methodis experimentally examinedand verifiedby simulations.Thecomparisonwith thetraditional RAIM algorithmshows thatthis method greatly improvesthe integrity ofthe GNSS, andcanprovide some referencesforsatellite-based railway applications.