BDS不同服务体制下授时模型差异研究

随着北斗卫星导航系统(BDS)的全球组网发射完成,BDS逐步实现了向全球用户提供基本导航（卫星无线电导航业务(RNSS)、向中国及周边区域用户提供区域短报文通信（卫星无线电测定业务(RDSS)、星基增强(SBAS)等服务的“三步走”规划．为研究BDS不同服务体制下的授时差异,本文从时空基准、授时精度检核、设备时延、卫星健康状态等方面,分析了基于已知位置的BDS RDSS单／双向授时、RNSS单／双频授时及SBAS单频授时模型差异,并给出了基于本文授时模型下的BDS不同体制授时精度,以为利用BDS进行授时服务的用户机研制、生产、测试和检验提供参考. 

Timing difference of the BDS under different service system

As the launch of the BeiDou navigation satellite system (BDS) completed,it realizes the three-step development strategy,which can provide RNSS service for global users and RDSS and SBAS service for regional users.In order to analyze the differences of the timing in different services,we have compare the timing and space reference,operating requirement and device delay in RDSS one-way／two-way timing,RNSS signal single frequency／double frequency and SBAS signal single frequency,and provide different timing results based on different models proposed in the paper.It can provide reference for the development,production and testing for the timing user with BDS.