摘要
针对BDS系统GEO卫星存在伪距长周期多路径效应引起的系统性偏差LPME(Long Period Multipath Effect)的特点,提出顾及LPME的BDS非组合PPP数学模型。其中,为简化运算和提高法方程结构强度,将LPME参数在1 d内视为常数估计,对GEO卫星和MEO/IGSO卫星观测值赋予相同的权重。选取2015年年积日为150的29个MEGX跟踪站数据进行验证,并设置两组实验对比模型。结果表明:相较于降低GEO卫星观测值权重或者直接忽略GEO卫星的定位模型,新提出模型能够有效减少PPP的伪距残差、增加数据利用率、缩短收敛时间,并能在E、N、U方向带来10%左右的定位精度方面的提升。
Aiming at the characteristics of long Period Multipath Effect(LPME) caused by pseudorange long period multipath effect of GEO satellite in BDS-2, a BDS-2 un-combined PPP mathematical model considering LPME is proposed. In order to simplify the calculation and improve the structural strength of the normal equation, LPME parameters are regarded as constant estimates in one day, and the observation values of GEO satellites and MEO/IGSO satellites are assigned the same weight. The data from 29 MEGX tracking stations with 150 cumulative days in 2015 is selected to verify the model algorithm and two sets of experimental comparison models are set up. The results show that the new model can effectively reduce the pseudorange residuals of PPP, increase the data utilization rate, shorten the convergence time, and improvement the positioning accuracy of about 10% in E,N,U direction compared with the model of reducing the weight of GEO satellite observation value or directly ignoring GEO satellite positioning model.
作者
章繁
刘长建
张熙
冯绪
刘宸
段文涛
ZHANG Fan;LIU Changjian;ZHANG Xi;FENG Xu;LIU Chen;DUAN Wentao(Information Engineering University,Zhengzhou 450001,China;Beijing Satellite Navigation Center,Beijing 100094,China;61287 Troops,Chengdu 610000,China)
出处
《测绘科学技术学报》
北大核心
2019年第5期464-469,共6页
Journal of Geomatics Science and Technology
基金
国家自然科学基金项目(41374041)。
