基于北斗三号PPP-B2b轨道的实时精密共视时间传递

Real-time precise common-view time transfer based on BDS-3 PPP-B2b orbit

关键词:  精密共视  北斗三号  PPP-B2b  卫星轨道  载波相位

Key words:  Precise common-view  BDS-3  PPP-B2b  Satellite orbit  Carrier phase

摘要:

面向精密可靠的远程时间传递需求，提出一种基于北斗三号PPP-B2b轨道的实时精密共视时间传递方法。该方法利用北斗三号精密单点定位(precise point positioning, PPP)服务提供的精密轨道改正数，根据实时载波相位单差技术估算异地接收机的相对钟差，实现高精度时间传递。基于中国及周边地区6个跟踪站连续多天的北斗三号系统观测数据开展试验，验证了该时间传递方法的性能。试验结果表明：零基线时间传递结果的标准差优于0.03 ns。与事后PPP时间传递相比，长基线时间传递结果差值的标准差优于0.3 ns，时间传递天边界连续性更好。基于北斗三号PPP-B2b轨道的实时精密共视时间传递方法，不依赖精密卫星钟差，能实现亚纳秒量级的时间传递精度，具有易于实现、连续性好的优势。试验结果可为北斗精密时间服务提供一定的参考。

Abstract:

In order to meet the needs of precise and reliable remote time transfer, a real-time precise common-view time transfer method based on BDS-3(BeiDou-3 navigation satellite system) PPP-B2b orbit is proposed. The method utilizes the precise orbit corrections provided by BDS-3 precise point positioning(PPP） service to estimate the relative clock difference of the remote receiver according to the real-time carrier phase single difference technology, and achieve the high-precision time transfer. Based on the multi-day BDS-3 observation data of six tracking stations in China and surrounding areas, the performance of the time transfer method is verified. The test results show that the standard deviation of the zero-baseline time transfer result is better than 0.03 ns. Compared with the PPP time transfer, the standard deviation of difference between the long baseline time transfer results is better than 0.3 ns, and the day-boundary continuity of the time transfer is better. The real-time precise common-view time transfer method based on BDS-3 PPP-B2b orbit does not rely on precise satellite clock, and can reach sub-nanosecond accuracy. It has the advantages of easy implementation and well continuity. The test results can provide some reference for BDS precise time service.