天文学进展2018，Vol.36Issue(2)：205-212,8.DOI:10.3969/j.issn.1000-8349.2018.02.07
星基增强系统10参数广播星历拟合分析
Analysis in Fitting SBAS 10-Parameter Broadcast Ephemeris Model
摘要
Abstract
SBAS designed a new 10-parameter ephemeris model,which would be broadcast on the new SBAS signal at L5.The model was a subset of GPS 16-parameter ephemeris model,which was based on an augmented set of Kepler orbital elements.The purpose of this model was to support the wide range of orbit classes being considered for SBAS,such as MEO and IGSO.Based on a year of Beidou GEO,IGSO and MEO satellite precise orbit data,this paper evaluated the new SBAS ephemeris model in terms of the fitting accuracy and failure rate,as well as the computational effort.To avoid fitting failure,this paper tried a method which was to exclude the IDOT term in the model fitting.The conclusion was that SBAS 10-parameter ephemeris model can achieve a 10-3cm fitting accuracy on average.Excluding the IDOT term was effective to avoid failure in some circumstances during the calculation.Fitting without the IDOT term can avoid fitting failure,but in the cost of decreasing the accuracy to about 10-1cm to 1 cm.Moreover,for different classes of orbit,the computational effort has different degree of increasing or decreasing after excluding the IDOT term.关键词
星基增强系统/星历拟合/L5信号,全球导航卫星系统Key words
satellite-based augmentation system/ephemeris fitting/signal L5/global navi-gation satellite system分类
天文与地球科学引用本文复制引用
陆畅,胡小工,周善石,唐成盼,董文丽..星基增强系统10参数广播星历拟合分析[J].天文学进展,2018,36(2):205-212,8.基金项目
国家重点研发计划项目(2016YFB0501900) （2016YFB0501900）
