摘要
针对传统全球导航卫星系统(GNSS)多频多系统精密单点定位(PPP)解算中系统间偏差(ISB)参数的随机模型多采用常数估计的局限性,提出以随机游走模型、白噪声模型和固定常数模型对其进行估计.基于不同分析中心所提供的精密产品,采用连续7 d 15个多全球导航卫星系统实验(MGEX)跟踪站的实测数据,系统地分析了不同ISB随机模型对全球定位系统/伽利略卫星导航系统(GPS/Galileo)三频非差非组合动态PPP定位精度与收敛时间的影响.结果表明:对于使用法国国家太空研究中心(CNES)与欧洲定轨中心(CODE)精密产品的多系统PPP,3种估计策略的定位精度与收敛时间基本相同;对于使用德国地学中心(GFZ)精密产品的多系统PPP,采用常数估计策略对定位误差的影响可高达约0.12 m.综合多天多测站统计结果,与常数估计相比较,将ISB作为高斯白噪声或者随机游走进行估计,三频动态PPP在东方向定位精度的改善显著,提高比率分别约为25%和15%.
Considering the limitation of constant estimation on traditional stochastic models of inter-system bias(ISB) parameters in the Global Navigation Satellite System(GNSS) precise point positioning(PPP), the random walk model, white noise model and fixed constant model are proposed to estimate ISB in this paper. Based on the precision products provided by different analysis centers, 7-day observation data from 15 Multi-GNSS expenment(MGEX) stations distributed globally was used to analyze the influence of ISB stochastic models on positioning accuracy and convergence time of GPS/Galileo triple-frequency undifferenced and uncombined kinematic PPP. The research results show that the differences in positioning accuracy and convergence time are not obvious among different ISB handling schemes for Centre National d’Etudes Spatiales(CNES) and Centre for Orbit Determination in Europe(CODE) precision products. As for multi-GNSS PPP solutions with German Research Centre for Geosciences(GFZ) precision products, the positioning error derived from constant handling schemes can be up to 0.12 m. The random walk and white noise handling schemes can improve the positioning accuracy in east direction significantly compared with constant handling schemes, and the improvement rates reach 25% and 15%, respectively.
作者
吕伟才
高井祥
LUWeicai;GAO Jingxiang(School of Geomatics,Anhui University of Science&Technology,Huainan,Anhui 232001,China;Key Laboratory of Aviation-aerospace-ground Cooperative Monitoring and Early Warning of Coal Mining-induced Disasters of Anhui Higher Education Institutes,Anhui University of Science&Technology,Huainan,Anhui 232001,China;School of Environmental Science and Spatial Informatics,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China)
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2019年第6期1383-1390,共8页
Journal of China University of Mining & Technology
基金
国家自然科学基金项目(41474026)
关键词
多系统PPP
系统间偏差
三频PPP
非差非组合PPP
multi-GNSS PPP
inter-system biases
triple-frequency PPP
uncombined and undifferenced PPP
