北斗GEO卫星广播星历的直接拟合算法研究

发布时间：2018-04-22 10:02

本文选题：卫星导航系统 + 广播星历参数　；参考：《华中科技大学学报(自然科学版)》2014年03期

【摘要】：针对因北斗地球静止轨道(GEO)卫星的小倾角特性,经典全球卫星定位系统(GPS)广播星历拟合算法不能直接应用于北斗GEO卫星这一问题,提出了一种基于无奇点变换的北斗GEO卫星广播星历直接拟合算法.该算法采用一组无奇点轨道根数代替经典轨道根数,解决了由GEO轨道的小倾角特性引起的经典广播星历拟合过程中法化矩阵奇异的问题;同时,避免了接收机GEO广播星历参数用户算法中坐标旋转的过程,减少了GEO用户算法的计算步骤.经仿真验证:该算法可很好地适用于北斗GEO卫星广播星历拟合,且拟合精度高,完全满足接收机导航定位的精度.但对于圆地球轨道(MEO)和倾斜地球同步轨道(IGSO)卫星,该算法实用性较差,仍须进一步研究和改进.
[Abstract]:In view of the small inclination characteristics of the Beidou geostationary orbit (GEO) satellite, the classical GPS broadcast ephemeris fitting algorithm can not be directly applied to Beidou GEO satellite. A direct fitting algorithm for Beidou GEO satellite broadcast ephemeris based on no singularity transform is proposed. In this algorithm, a group of orbital roots without singularities is used to replace the classical orbital roots, which solves the problem of normalizing matrix singularity in the classical broadcast ephemeris fitting process, which is caused by the small inclination characteristic of the GEO orbit. The process of coordinate rotation in the user algorithm of receiver GEO broadcast ephemeris is avoided and the calculation steps of GEO user algorithm are reduced. The simulation results show that the algorithm is suitable for Beidou GEO satellite broadcast ephemeris fitting, and the fitting accuracy is high, which fully meets the accuracy of receiver navigation and positioning. However, for MEO (circular Earth orbit) and IGSO (tilted geosynchronous orbit) satellites, the practicability of this algorithm is poor, so it needs further study and improvement.
【作者单位】：北京理工大学信息与电子学院;
【基金】：国家自然科学基金资助项目(61120106004,61225005)
【分类号】：TN967.1

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