Track occupancy discrimination method based on single antenna heading measurement
With the completion of the Beidou satellite system,onboard train positioning with satellite navigation as the core has become the development direction of the train positioning system.In this background,accurate identification of train track occupancy has become a necessary prerequisite to ensure high-precision position perception of trains,which is of great significance to avoid conflicts,support train scheduling decisions and ensure train safety.Traditional track occupancy judgment methods usually rely on ground equipment and are easily limited by factors such as cost,complexity,and maintenance difficulty.To solve these problems,a low-cost and high-accuracy single GNSS antenna method was proposed to measure train heading angle.Especially in the turnout throat area,the deviation between the single antenna measurement result and the train heading in the database was calculated.And then the occupation probability of different tracks was evaluated.Therefore,firstly,a double difference model of carrier phase difference between satellites and epoch difference was constructed,which eliminated the influence of a series of satellite positioning errors such as ionosphere,troposphere,clock error and ambiguity.Secondly,the extended Kalman filter was used to estimate the relative position vector between adjacent epochs and calculate the train heading angle in pseudo-attitude coordinate system.Finally,based on the deviation of heading angle,the occupation of train track was judged,and the proposed algorithm was verified by the measured data of trains entering and leaving Liantonghe Station of Qinghai-Tibet Railway.Combined with the track electronic map,the confidence probability of trains occupying different tracks on the main line/sidetrack was judged.The experimental results show that the root mean square error of calculating the train heading angle by single antenna is 0.111°,and the distance of the fuzzy zone for track discrimination based on the heading angle deviation is reduced by about 50m,and the time of the fuzzy zone is reduced by about 5s.High-precision heading measurement can be completed through only single-antenna heading calculation.Using heading angle deviation for track occupancy discrimination can provide a feasible method and has engineering value.
万方数据
维普
