BDS-3多种授时方法精度试验及比较分析

北斗卫星导航系统(BDS)本质上是一个高精度时间空间信息服务系统,是我国 自主运行的重要空间基础设施.BDS-3已于2020年7月正式开通,向广大用户提供RNSS、SBAS、RDSS单向和RDSS双向等多种授时服务.针对BDS-3提供的各种授时服务进行了简要介绍,详细讨论了各种授时方法,并利用实测数据进行了试验验证和比较分析.结果表明,BDS-3授时服务精度全部优于公布的指标要求,其中精度最高的SBAS授时方法精度可达2ns左右,RDSS双向授时精度和RNSS授时精度相当,达到9ns左右,RDSS单向授时精度最差,在15～30ns左右.

Precision Test and Comparative Analysis of BDS-3 Various Timing Methods

As an important space infrastructure of China, BeiDou navigation satellite system (BDS) is essentially a high-precision time and space service system. BeiDou global navigation satellite system (BDS-3) has been in operation since July 2020, which can provide various time services, such as RNSS, SBAS, RDSS one-way, RDSS two-way. This paper gives a brief introduction of BDS-3 time services, and discusses various time service methods in detail. Moreover, experimental verification and comparative analysis are carried out from measured data. The results show that the precision of BDS-3 time service is better than the given published index, where SBAS time service has the highest precision at about 2ns, the RDSS two-way time service and RNSS time service are consistent at about 9ns, and RDSS one-way time service is the worst ranging from 15ns to 30ns.