基于QZSS信息增强的GNSS精密单点定位性能分析

Augmented GNSS precise point positioning performance analysis based on QZSS information

目前研究多集中在准天顶卫星系统(QZSS)播发的定位导航和授时(PNT)信息的定位表现,而对其播发的增强信息的精密单点定位(PPP)研究较少,因此文章对比评估了QZSS播发的PNT信息与增强信息的PPP表现。分别选择以上两种信息进行静态PPP和动态PPP,采用QZSS PNT信息与QZSS增强信息分别和全球导航卫星系统(GNSS)数据组合进行PPP解算,评估指标选取定位精度和收敛时间。结果表明:使用QZSS PNT信息,组合后静态PPP定位精度小于4.50 cm,收敛时间小于92.00 min,动态PPP定位精度小于5.40 cm,收敛时间小于290.00 min。使用QZSS增强信息,静态PPP定位精度小于2.00 cm,收敛时间小于61.00 min;动态PPP定位精度小于6.50 cm,收敛时间小于162.00 min。与PNT信息相比,使用QZSS增强信息进行PPP定位的收敛时间要至少缩短三分之一,定位精度在静态PPP模式下提高约一倍,在动态PPP模式下略微下降,总体精密定位表现更佳。

At present,most researches focused on the positioning performance of positioning,navigation and timing(PNT)information broadcast by Quasi-Zenith satellite system(QZSS),but there are few researches on precise point positioning(PPP)of augmented information broadcast by QZSS.Therefore,this paper evaluated the PPP performance of PNT information and augmented information broadcast by QZSS.The above two kinds of information was selected respectively for static PPP and dynamic PPP,and the QZSS PNT information and QZSS augmented information were combined with GNSS data respectively for PPP calculation,and the positioning accuracy and convergence time were selected for evaluation indexes.The results showed that the static PPP positioning accuracy was less than 4.50 cm and the convergence time is less than 92.00 min,and the dynamic PPP positioning accuracy was less than 5.40 cm and the convergence time was less than 290.00 min after using the QZSS PNT information.Using QZSS augmented information,static PPP positioning accuracy was less than 2.00 cm,convergence time was less than 61.00 min.The dynamic PPP positioning accuracy was less than 6.50 cm,and the convergence time was less than 162.00 min.Compared with PNT information,the convergence time of PPP using QZSS augmented information was shorten by at least one-third.The positioning accuracy was increased by about double in static PPP mode,but slightly decreased in dynamic PPP mode,and the overall precision positioning performance was better.