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中南大学学报(自然科学版)

Journal of Central South University

第46卷    第7期    总第251期    2015年7月

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文章编号:1672-7207(2015)07-2504-06
基于半长轴补偿的广播历书参数改进计算方法
靖守让,吴鹏,刘文祥,孙广富

(国防科技大学 电子科学与工程学院,湖南 长沙,410073)

摘 要: 基于全球定位系统(global positioning system, GPS)历书参数忽略了卫星轨道近地点角的变化,无法准确描述中圆地球轨道(medium earth orbit, MEO)卫星轨道的长期变化规律,直接使用历书参数进行最小二乘拟合的传统方法无法取得较高精度等问题,针对非历书长期改正项对位置计算的影响进行分析,提出一种基于半长轴补偿的广播历书改进计算方法。对拟合历书增加角速度变化量,并利用其对半长轴平方根进行补偿从而获得广播历书参数。研究结果表明:通过此方法拟合6 d卫星轨道数据,位置误差为数千米,用户测距误差(user range error, EUR)小于900 m,比传统直接历书拟合方法精度提高1倍以上;改进法获得的历书外推8 d的用户测距误差小于3 km,采用传统方法获得的历书用户测距误差达8 km。

 

关键词: MEO卫星;扩展历书参数集;半长轴补偿;历书拟合;用户测距误差

Fitting method of improved almanac parameters with semi-major axis compensation
JING Shourang, WU Peng, LIU Wenxiang, SUN Guangfu

College of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China

Abstract:Considering that the medium earth orbit (MEO) satellite orbit is ineffectively described by the global positioning system (GPS) almanac without considering the change of the argument of perigee, the traditional algorithm using almanac parameters can’t directly obtain good effect via the least squares curve fit, an almanac calculation method based on semi-major axis compensation was proposed by analyzing the effect of elements for calculating satellite position, which was neglected by almanac parameters. An extended fitting almanac considering mean motion difference was provided. The broadcast almanac parameters were acquired by compensating the effect of mean motion difference on semi-major axis. The simulation results show that the satellite position error of almanac generated by the method is just several kilometers in 6 d, and the user range error is less than 900 m, whose precision doubles than that of the method fitted using almanac parameters. EUR of almanac generated by the proposed method is less than 3 km in 8 d extrapolation, while that of the traditional method is more than 8 km.

 

Key words: medium earth orbit (MEO); extended almanac parameters set; semi-major axis compensation; almanac fitting; user range error (URE)

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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