EGNSS授时服务安全性发展综述

Review of safety analysis of EGNSS time service

时间广泛应用于各行各业,基于卫星导航系统的星基授时与时间同步技术是人们获取时间的主要方式。时间的重要性及卫星导航系统的固有脆弱性,使得授时安全性成为用户关注的重要因素。目前,国内尚未建立关于授时安全性的相关概念和体系。本文主要介绍Galileo授时服务扩展与整合项目在授时安全性方面的初步研究结果。首先,根据用户对时间精度的需求,将卫星导航系统提供的授时服务定义为3个等级,确定了授时服务安全性要求。从影响授时的各项因素出发,分析了不同等级的固有异常概率。最后,设计了消除授时异常的安全性架构体系,达到授时服务的安全性要求。该项目的研究思路和成果可为北斗卫星导航系统授时安全性定义和体系架构设计提供参考。

Time is widely used in various aspects of life.Time service and time synchronization technology based on navigation satellites are the important ways to access time.Considering the importance of time and the inherent vulnerability of satellite navigation system,the safety of time service becomes the main focus.At present,there are fewer studies on the concept and architecture about the safety of time service.This paper introduces the preliminary research results of Galileo timing service extension and consolidation project on safety of time service in European.Firstly,the time service provided by satellite navigation system is defined as three levels according to the user’s requirement for time accuracy,then the safety requirements of time service are determined.And the inherent hazard probability of each level is analyzed while considered the factors that affect time service.Finally,the safety architecture is designed to eliminate failures.The research ideas and preliminary results can provide valuable reference for the definition and design of BDS timing safety.