BDS-3 B2b-PPP URA评估精化与播发方法

Methods of URA evaluation refinement and re-broadcast based on BDS-3 B2b-PPP service

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中文摘要：用户距离精度指数(URAI)作为导航系统定位服务完好性标识,在提供卫星可用性信息的同时,也反映了卫星的轨道钟差精度.本文提出将B2b电文中随轨道改正数播发的URAI信息恢复为用户距离精度(URA),并用于B2b-PPP的随机模型构建.对其进行定位性能评估,发现B2b自身播发的URA精度较差.针对该问题,利用分布在中国及周边区域的多个全球卫星导航系统(GNSS)监测站对B2b的URA参数进行重估计.实验结果表明:精化后的URA能显著提升B2b-PPP的服务性能.相比于仅考虑观测噪声和高度角的随机模型,使用精化后的URA作为随机模型,动态和静态定位模式下的收敛时间提升分别达到18.9％、14.5％;收敛后定位精度提升分别达到11.2％、8.9％.在此基础上,进一步结合北斗卫星导航系统(BDS)短报文,提出一种精化后URA的播发方法,结合现有短报文通信效率进一步分析了精化URA的用户使用性能.

外文摘要：The user range accuracy index (URAI) serves as an indicator of the integrity of positioning service systems,providing satellite availability information while also reflecting the accuracy of satellite orbit and clock corrections. This paper initially utilized the user range accuracy (URA) information broadcasted alongside orbit corrections in the BDS-3 B2b precise point positioning (B2b-PPP) service for positioning stochastic model establishment and evaluation. Statistical analysis demonstrated the relatively poor accuracy of URA broadcasted by BDS-3 B2b itself. Therefore,this study re-estimated the B2b URA parameters using multiple global navegation satellite system (GNSS)stations distributed in China and surrounding areas as monitoring stations. Positioning verification showed that refined URA significantly enhanced B2b-PPP service performance:using refined URA as part of the positioning stochastic model results in a 18.9％ and 14.5％ reduction in convergence time for dynamic and static positioning modes,respectively,and an improvement of 11.2％ and 8.9％ in post-convergence positioning accuracy. Building upon this,the paper further proposed a refined URA broadcast method integrated with BDS short message communication (SMC) system. By utilizing practical short message communication devices,the study analyzed the impact of existing short message communication efficiency on the performance of refined URA.

外文关键词：

BeiDou-3 global navigation satellite system (BDS-3)B2b precise point positioning (B2b-PPP)user range accuracy (URA)positioning stochastic modelBDS short message communication (SMC)

作者：

宋子远、陈俊平、张益泽、唐文杰

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作者单位：

中国科学院上海天文台,上海 200030

中国科学院大学天文与空间科学学院,北京 100049

上海市空间导航与定位技术重点实验室,上海 200030

关键词：

北斗三号全球卫星导航系统(BDS-3) B2b精密单点定位(B2b-PPP) 用户距离精度(URA) 定位随机模型 BDS短报文(SMC)

基金：

国家自然科学基金国家重点研发计划上海张江国家自主创新示范区专项发展资金重大项目

项目编号：

116730502018YFB0504300ZJ2018-ZD-009

出版年：

2024

DOI：

10.16547/j.cnki.10-1096.20240407

导航定位学报

CSTPCD北大核心

影响因子：0.72

ISSN：

年,卷(期)：2024.12(4)