| 利用超快速精密星历约束的北斗卫星实时精密定轨 |
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| 引用本文： | 范 磊,施 闯,李 敏.利用超快速精密星历约束的北斗卫星实时精密定轨[J].大地测量与地球动力学,2018,38(9):937-942. |
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| 作者姓名： | 范 磊 施 闯 李 敏 |
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| 摘 要： | 以广播星历为起算轨道的北斗卫星实时滤波精密定轨往往需要较长收敛时间，针对此，提出利用超快速精密星历约束的实时精密定轨方法。通过MGEX跟踪网全球分布的51个测站连续7 d的实测数据，利用平方根信息滤波对北斗卫星实时精密轨道进行确定，并以3 d解事后轨道作为参考，评估北斗卫星实时滤波轨道精度。结果表明，利用广播星历作起算轨道时，北斗实时滤波轨道平均需要经过15 h收敛才能达到稳定，而新方法在这段时间内轨道变化较为平稳，未出现明显的收敛现象，并且7 d时间内GEO卫星在切向、法向和径向上RMS分别优于2.5 m、20 cm和30 cm，IGSO和MEO卫星在3个方向上分别优于30 cm、15 cm和10 cm。
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| 关 键 词： | BDS 实时精密定轨 超快速精密星历 平方根信息滤波 |
Beidou Satellite Real-Time Precise Orbit Determination Using Ultra-Rapid Ephemeris’ Constraint |
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| FAN Lei,SHI Chuang,LI Min.Beidou Satellite Real-Time Precise Orbit Determination Using Ultra-Rapid Ephemeris’ Constraint[J].Journal of Geodesy and Geodynamics,2018,38(9):937-942. |
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| Authors: | FAN Lei SHI Chuang LI Min |
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| Abstract: | In Beidou satellite real-time precise orbit determination, the filtering method has a long convergence time when using the initial orbit parameter obtained from broadcast ephemeris. To solve this problem, an enhanced method is proposed in this paper: the initial orbit parameter is derived by orbit fitting using the predicted part of ultra-rapid ephemeris and a constraint is introduced to the orbit parameter during a certain period after filtering starts. To validate our method, 7 days’ real tracking data collected from 51 globally distributed MGEX stations are used to determine BDS satellites’ real-time precise orbit based on square root information filtering(SRIF). A 3-day solution obtained in a batch estimation is used as “truth” to evaluate the precision of the real-time orbit. Results show that, an average value of 15 hours is needed before the BDS satellites’ orbit comes to a steady state with high accuracy, while a rather stable result is obtained and no obvious convergence is found during this period when the new method is used. In addition, the RMS of GEO satellites’ orbit is better than 2.5 m, 20 cm and 30 cm in along-track, cross-track and radial respectively in 7 days; meanwhile, values better than 30 cm, 15 cm and 10 cm can be achieved for IGSO and MEO satellites respectively. |
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| Keywords: | BDS real-time precise orbit determination ultra-rapid ephemeris square root information filtering (SRIF) |
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