摘要
针对精密单点定位(PPP)技术因待估参数较多且参数之间相关性较强,导致定位收敛时间较长的问题,提出一种北斗三号全球卫星导航系统(BDS-3)精密单点定位性能分析方法:指出利用附加电离层约束可有效加快PPP收敛;然后给出北斗卫星导航(区域)系统即北斗二号(BDS-2)、BDS-3分别实时提供的克洛布彻(Klobuchar)改正模型(BDSKlob)和北斗全球电离层延迟改正模型(BDGIM);最后对2022年1月磁场平静期的附加全球电离层模型增强信息的BDS-3 PPP进行系统评估与分析。结果表明:以事后全球电离层图(GIM)产品为参考,BDSKlob和BDGIM模型在全球范围下精度分别为4.15总电子含量单位(TECU,1TECU=1×10^(16)个电子/m^(2))和3.10 TECU,在中国区域内分别为3.32 TECU和2.79 TECU;附加GIM、BDGIM、BDSKlob不同电离层约束的PPP在三维方向收敛速度上可分别加快9.7%、5.8%、1.9%,在东方向上的增益最多,可分别达到19.3%、17.6%、10.3%。
Aiming at the problem of long convergence time of precise single point positioning(PPP)technology due to the large number of parameters to be estimated and strong correlation between parameters,the paper proposed a performance analysis method of BeiDou-3 global navigation satellite system(BDS-3)precise point positioning(PPP):it was pointed out that the use of additional ionospheric constraints could effectively accelerate PPP convergence;then,the real-time Klobuchar correction model(BDSKlob)and BDS-3 global ionospheric delay correction model(BDGIM)were provided by BeiDou navigation satellite(regional)system(BDS-2)and BDS-3,respectively;finally,the BDS-3 PPP with additional global ionospheric model enhanced information during the magnetic field calm period in January 2022 was systematically evaluated and analyzed.Results showed that using the post global ionospheric map(GIM)product as a reference,the BDSKlob and BDGIM models would have the accuracies of 4.15 total electron content units(TECU)and 3.10 TECU globally,and 3.32 TECU and 2.79 TECU in the Chinese region,respectively;PPP with different ionospheric constraints such as GIM,BDGIM and BDSKlob would accelerate the convergence speed in the three-dimensional direction by 9.7%,5.8%,and 1.9%,respectively;meanwhile,the gain in the eastward direction would be the highest,reaching 19.3%,17.6%,and 10.3%,respectively.
作者
张继洋
潘林
陈刘成
王腾
肖琨武
戴吾蛟
ZHANG Jiyang;PAN Lin;CHEN Liucheng;WANG Teng;XIAO Kunwu;DAI Wujiao(School of Geoscience and Info-Physics,Central South University,Changsha 410083,China;China Satellite Network Group Co.Ltd.,Beijing 100160,China)
出处
《导航定位学报》
北大核心
2025年第5期109-119,共11页
Journal of Navigation and Positioning
基金
国家自然科学基金项目(42388102)
湖南省国土自然资源厅支持项目(HNGTCH-2023-05)。
