基于北斗混合星座的星历参数适用性分析
收稿日期: 2013-05-07
修回日期: 2014-01-06
网络出版日期: 2014-02-14
Analysis on Applicability of Ephemeris Parameters for Mixed Beidou Constellation
Received date: 2013-05-07
Revised date: 2014-01-06
Online published: 2014-02-14
针对北斗全球卫星导航系统混合星座条件下不同星历参数表达方法的性能评估问题，采用了从信息占用量、轨道拟合精度、接收机首次定位时间3个方面统筹考虑的评价方法。针对北斗系统的混合星座构型，比较北斗广播星历16参数和新设计的广播星历18参数的参数定义及用户算法异同，分析了不同星历参数表达所带来的性能变化。仿真分析结果表明，两种星历参数表达虽然都能描述北斗混合星座中的地球同步轨道（GEO）、中间地球轨道（MEO）、倾斜地球同步卫星轨道（IGSO）的卫星轨道特性，但是它们的具体性能有明显的差异，星历18参数的轨道拟合精度比16参数的提高了2~3 cm，但其信息表达却多占用了63 bit，且接收机首次定位时间多消耗了1.26 s。
周鸿伟 , 王陆潇 , 宿晨庚 , 王福伟 . 基于北斗混合星座的星历参数适用性分析[J]. 航空学报, 2014 , 35(4) : 1064 -1070 . DOI: 10.7527/S1000-6893.2013.0511
To address the performance evaluation of the ephemeris parameters in the mixed Beidou navigation satellite system constellation, this paper adopts an evaluation method which takes into consideration three aspects: the information space, orbit fitting precision, time to start the first fix. For the mixed constellation in the Beidou navigation satellite system, the broadcast ephemeris of 16 parameters and the newly designed ephemeris of 18 parameters are compared in terms of parameter definitions and user algorithms, and the performances of the two different ephemerides are analyzed. Simulation results show that the parameter expressions of the two ephemerides can both well describe the geostationary earth orbit (GEO), medium earth orbit (MEO), and inclined geosynchronous satellite orbit (IGSO) of satellite orbit characteristics. As to the ephemerides 16 and 18 parameters applied to the mixed constellation, the fitting error of the ephemeris of 18 parameters is smaller by 2-3 cm but its information occupation is 63 bit more. Moreover, its receiver's first fix time is longer by 1.26 s.
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