Analysis of PPP-B2b Positioning Performance Enhanced by High-Precision Ionospheric Products
Objectives:The BeiDou-3 satellite navigation system(BDS-3)can provide real-time precise point positioning(PPP)services to China and neighboring regions through PPP-B2b signals.Because PPP-B2b signals do not contain ionospheric model products,the current positioning research mainly adopts iono-spheric-free combination.The positioning accuracy can reach decimeter level,but requires about 30 min of convergence time.In this paper,aiming at the long convergence time of PPP-B2b positioning,the im-provement of positioning convergence performance based on ionospheric model products is analyzed.Methods:Quasi-4-dimensional ionospheric modeling is introduced into regional ionospheric delay modeling in China and four schemes of 50,100,150 and 200 reference stations uniformly distributed in China(day of year 201-207)are adopted for ionospheric modeling.Results:The results show that when the number of stations used in ionospheric modeling increases from 50 to 200,the accuracy of ionospheric model products in-creases from 2-3 TECU to better than 0.8 TECU.Compared with the current ionospheric-free combined PPP,the convergence time of BDS-3 dynamic PPP can be deceased by 77％ .In addition,the convergence time of GPS+BDS-3 dynamic PPP is reduced from 13.51 min to 4.45 min.Conclusions:High-precision ionospheric model products can significantly shorten the convergence time of PPP-B2b.
ionospheric modelBeiDou-3 satellite navigation systemPPP-B2bprecise point position-ingrapid convergence
万方数据
维普
