赵齐乐,李晓涛,耿江辉

• 1:武汉大学卫星导航定位技术研究中心

摘要(Abstract)：

多系统精密单点定位(precise point positioning,PPP)模糊度固定及部分模糊度固定策略对实现快速模糊度固定至关重要。评估了当前GPS/GLONASS/BeiDou/Galileo 4系统星座状态下PPP首次模糊度固定时间所能够达到的水平。当首次模糊度固定时间小于300s时,GPS固定模式的固定解比例仅为28%,若改为GPS/GLONASS/BeiDou/Galileo固定模式,则固定解比例可高达90%。GPS固定模式的首次模糊度固定时间为533s,而GPS/GLONASS/BeiDou/Galileo固定模式仅需176s,改进了约67%。4系统模糊度固定情况下全部模糊度固定解的首次模糊度固定时间为290s,而部分模糊度固定解的这一时间则为166s,部分模糊度固定策略在多系统PPP模糊度固定中的运用使得首次模糊度固定时间大约缩短了43%。未来GPS、GLONASS、BeiDou和Galileo 4个全球导航卫星系统的可视卫星个数可达120颗,PPP首次模糊度固定时间有望进一步缩短,从而有力推动PPP在实时定位领域中的应用。

关键词(KeyWords)： GNSS;PPP;快速模糊度固定;首次模糊度固定时间

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(41774035,41404032,41674004)

作者(Author): 赵齐乐,李晓涛,耿江辉

DOI: 10.14188/j.2095-6045.2018171

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