卫星导航时间传递性能的分析与比较

Analysis and Comparison of Capability of GNSS Time Transfer

卫星导航系统本身具有时间传递性能,其时间传递技术包括接收机单点定位授时、两站点卫星共视和基于差分技术的相对时间同步,为分布式电子信息系统的固定站点和运动平台间的时间同步提供了高精度的时间同步手段。本文针对卫星导航多种时间传递模式的原理和性能展开分析,对GPS、GLONASS、GALILEO和Compass的时间传递性能进行对比分析。利用两套具有多系统多星座共视的载波相位时间传递技术的时间传递设备开展了长基线时间传递试验,试验结果表明利用卫星导航能够实现的1000km长基线时间传递的最佳精度可达5ns。

GNSS has the capability of time transfer. The technologies used for the time transfer include time transfer of precise point positioning, time transfer using common view method, relative time synchronization with DGNSS. The methods are used to achieve high precise time synchronization between fixed station and mobile platform of a typical distributing system. By analyzing the principle and capability of several GNSS time transfer modes, the paper gives a comparison and analysis of the time transfer capability of GPS, GLONASS, GALILEO and Compass. Two sets of time transfer systems using carrier phase time transfer technology of multiple systems and multiple satellites＇ common view are used to make an experiment of long baseline time transfer. The result shows that the precision of the carrier-phase time transfer using all the satellites＇ common-view is less than 5ns within 1000km of long baseline.