摘要
针对目前常用的16参数和18参数两种形式的广播星历,在分析16参数存在的拟合精度较低、18参数中存在的线性相关等问题的基础上,提出两种形式的17参数星历。然后以典型的卫星导航星座为例,分析比较16、17与18参数的星历拟合和预报精度以及参数拟合时效性。结果表明,在星历拟合与预报精度方面,17参数比16参数平均提高近50%,其拟合精度略低于18参数,但存在预报精度高于18参数的情况;在星历拟合时效性方面,17参数比16参数时间开销略有增加,但仅相当于18参数的47%。
Based on presently common 16 and 17 broadcastephemeris models, 17 parametersephemeris are introdused in this paper for the lower fitting precision of 16 parametersephemeris andlinearity relation between 18 parameters. Takingtypcial navigation satellites as an example,the paper analyses the fitting and predicting precision and the calculating efficiency of 3 ephemeris parameters models.Results of numercial simulation show that the fitting and predicting precision of 17 parameters which arecompared with 16 ephemris parameters have beenaveragely improved mostly 50%, and are alittle lower than 18 parameters. However, the predicting precision of 17 parameters can be better than 18 parameters possibly in some satellite orbit. The calculating time of 17 parametershaveaveragely insreased a few longer than 16 parameters, but only being equal to 47% calculating time of 18 parameters.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2014年第S2期106-110,共5页
Chinese Journal of Scientific Instrument
关键词
广播星历
导航星座
拟合精度
计算代价
broadcast ephemeris parameter
navigationsatellites
fitting precision
cost of calculating
