| GPS/BDS联合解算的列车高精度实时定位方法 |
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| 引用本文： | 王剑,周子健,姜维,蔡伯根,潘佩芬.GPS/BDS联合解算的列车高精度实时定位方法[J].交通运输工程学报,2021,21(5):286-296. |
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| 作者姓名： | 王剑 周子健 姜维 蔡伯根 潘佩芬 |
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| 作者单位： | 1.北京交通大学 电子信息工程学院，北京 1000442.北京交通大学 北京市轨道交通电磁兼容与卫星导航工程技术研究中心，北京 1000443.中国铁道科学研究院集团有限公司 电子计算技术研究所，北京 1000814.北京交通大学 轨道交通控制与安全国家重点实验室，北京 100044 |
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| 基金项目： | 国家重点研发计划项目2018YFB1201500国家自然科学基金项目U1934222国家自然科学基金项目62027809 |
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| 摘 要： | 为了构建智能化列车运行控制体系，针对卫星导航的铁路应用，开展了列车定位优化方法的研究；利用广播星历实时特性，借助框架转换模型为系统提供实时、准确、统一的时空参考；结合误差模型校正系统中与定位相关的误差，以降低定位解算复杂度；为了进一步优化系统定位性能，提高定位精度，提出一种基于GPS/BDS多星座联合解算的非差载波相位定位方法；利用京沈高铁实际数据进行仿真，对比了单星座定位方法和多星座定位方法的信号几何分布和定位误差；为了进一步验证提出定位方法的性能，利用同一组数据，将定位结果与传统伪距单点定位结果进行对比。试验结果表明:在测试期间，GPS和BDS单星座定位方法的可见卫星平均数分别为9.2和13.4颗，几何精度因子平均数分别为2.341 7和2.272 1；GPS/BDS多星座定位方法可见卫星平均数为22.5颗，几何精度因子平均数为1.264 6，因此，多星座定位方法能够成倍增加可见卫星数，优化卫星信号几何分布，在卫星信号连续变化条件下保证精确、连续定位；在卫星信号稳定区域内，伪距单点定位和提出的定位方法在空间三维方向上的定位均方根误差分别为5.396 1、5.569 7、2.831 2和0.976 1、0.988 8、0.861 8 m，在卫星信号受限区域内，伪距单点定位和提出的定位方法在3个方向上均方根误差分别为7.245 9、7.056 3、3.756 2和1.561 2、1.603 1、1.215 5 m，因此，相比于传统伪距单点定位，提出的定位方法能够在多个场景下获得更高的定位精度。
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| 关 键 词： | 铁路通信 高速列车 非差载波相位 多星座联合解算 广播星历 高精度定位 |
| 收稿时间： | 2021-03-21 |
High-precision real-time positioning method of train based on GPS/BDS combined solution |
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| WANG Jian,ZHOU Zi-jian,JIANG Wei,CAI Bai-gen,PAN Pei-fen.High-precision real-time positioning method of train based on GPS/BDS combined solution[J].Journal of Traffic and Transportation Engineering,2021,21(5):286-296. |
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| Authors: | WANG Jian ZHOU Zi-jian JIANG Wei CAI Bai-gen PAN Pei-fen |
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| Affiliation: | 1.School of Electronics and Information Engineering, Beijing Jiaotong University, Beijing 100044, China2.Beijing Engineering Research Center of EMC and GNSS Technology for Rail Transportation, Beijing Jiaotong University, Beijing 100044, China3.Institute of Computing Technology, China Academy of Railway Sciences Corporation Limited, Beijing 100081, China4.State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University, Beijing 100044, China |
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| Abstract: | To establish the intelligent train control system, the rail application of global satellite navigation system (GNSS) was focused, and the researches on the positioning optimization method of train were pursued. Based on the real-time characteristics of broadcast ephemeris, the frame transformation model was used to provide real-time, accurate and unified spatio-temporal reference for the system. Combined with the error model, the errors related to positioning were corrected to reduce the complexity of positioning solution. In order to further optimize the positioning performance of the system and improve the positioning accuracy, a non-differential carrier-phase positioning method based on GPS/BDS multi-constellation combined solution was proposed. A simulation was carried out based on the actual data of Beijing-Shenyang High-Speed Railway, the signal geometric distributions and positioning errors of single constellation positioning method and multi-constellation positioning method were compared. To further verify the performance of the proposed positioning method, its positioning result was compared with that of the traditional pseudorange-based single point positioning (SPP) method based on the same group of data. Experimental results show that, during the test, the visible average satellite numbers of GPS and BDS single constellation positioning methods are 9.2 and 13.4, respectively, and the means of geometric dilution of precision (GDOP) are 2.341 7 and 2.272 1, respectively. The visible average satellite number of GPS/BDS multi-constellation positioning method is 22.5, and the mean of GDOP is 1.264 6. Hence, the multi-constellation positioning method can multiply the number of visible satellites and optimize the geometric distributions of satellite signals, which ensures the accurate and continuous positioning under the continuous variation of satellite signal. When the satellite signal is relatively stable, the root mean square errors (RMSEs) of the three-dimensional positioning are 5.396 1, 5.569 7, 2.831 2 and 0.976 1, 0.988 8, 0.861 8 m with respect to the SPP method and the proposed method, respectively. In signal limited area, the RMESs are 7.245 9, 7.056 3, 3.756 2 and 1.561 2, 1.603 1, 1.215 5 m, respectively. Therefore, compared with the traditional SPP method, the proposed method can achieve better positioning accuracy under different signal conditions. 5 tabs, 7 figs, 22 refs. |
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