北斗GEO卫星用户算法的改进方法

发布时间：2018-03-10 04:00

本文选题：北斗卫星导航系统　切入点：GEO卫星　出处：《国防科技大学学报》2014年01期 　论文类型：期刊论文

【摘要】：针对北斗GEO用户算法需要进行5°倾角的坐标旋转处理这一过程,提出了采用经典广播星历参数用户算法直接解算北斗GEO卫星位置的改进方法,并同时给出了相应的基于第二类无奇点根数的广播星历拟合算法。该算法采用第二类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参数拟合过程中法化矩阵奇异的问题。从而避免了北斗GEO用户算法中坐标旋转处理过程,减少了GEO用户算法的计算步骤。仿真表明,提出的改进方法在卫星轨道拟合过程中与原算法精度相当;在卫星轨道外推过程中与原算法相比略有精度损失,但仍满足用户导航定位精度的需求。采用实际北斗GEO星历解算的轨道数据验证了改进算法的有效性。
[Abstract]:In view of the process that Beidou GEO user algorithm needs to deal with coordinate rotation of 5 掳inclination angle, an improved method of calculating the position of Beidou GEO satellite directly by using classical broadcast ephemeris parameter user algorithm is proposed. At the same time, the corresponding broadcast ephemeris fitting algorithm based on the second kind of singular root number is given. In this algorithm, the second kind of singular orbital root number is used to replace the classical orbital root number. The singularity of the normalized matrix in the classical broadcast ephemeris parameter fitting process caused by the small inclination characteristic of the GEO orbit is solved, thus avoiding the processing of coordinate rotation in the Beidou GEO user algorithm. The calculation steps of GEO user algorithm are reduced. The simulation results show that the proposed improved method has the same accuracy as the original algorithm in the course of satellite orbit fitting, and has a slight loss of accuracy compared with the original algorithm in the process of satellite orbit extrapolation. However, the accuracy of navigation and positioning is still satisfied. The effectiveness of the improved algorithm is verified by using the orbit data of the actual Beidou GEO ephemeris.
【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(61001128)
【分类号】：TN967.1

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