北斗双向授时技术在遥测地面站组网中的应用研究

卫星授时以其安全、可靠、稳定、精准等优势广泛应用于各领域。本文立足遥测地面站对时间的高精度、协同性、实时性、网络化的需求,在简述了几种典型授时技术应用特点的基础上,深入开展了北斗卫星授时技术研究。首先对北斗时间系统的组成,以及单向、双向授时技术优缺点等进行了论证,重点分析了RDSS（Radio Determination Satellite Service,卫星无线电测定业务）双向授时的技术实现、理论推导、误差影响和精度评估等;然后,结合遥测地面站授时现状和需求,提出了遥测地面站组网应用中时统的总体思路,通过三级控制、统一溯源、内外互联、由点到面的模式,构建了“以北斗双向授时为主,NTP（Network Time Protocol,网络时间协议）计算机网络授时为辅”的网络化授时体系,并对遥测地面站组网应用场景和入网策略进行了分析论证。本文研究具有较强的实践性和可行性,可为网络化授时应用提供参考。

Research of BeiDou bidirectional time service technology in telemetry ground station network

With its advantages of safety, reliability, stability and accuracy, satellites are widely used in various fields.Based on the requirements of telemetering ground stations for high accuracy, coordination, real-time and networking of time, the paper introduces several typical time service technologies and conducts in-depth research on BeiDou satellite time service technology. Firstly, the composition of BeiDou time system and the advantages and disadvantages of single and two-way time service technical realization, theoretical derivation, error impact and accuracy evaluation of RDSS two-way time service are analyzed emphatically. Then, combined with the current situation and requirements of the telemetering ground station time service, the general idea of time unification in the telemetering ground station networking application is proposed. Through three-level control, unified traceability, internal and external interconnection, and point-to-point mode, a networked time service system of "BeiDou two-way time service as the main, NTP computer network time service as the auxiliary" is constructed. The network application scenario and network access strategy of telemetry ground station are analyzed and demonstrated. The research has strong practicality and feasibility, and can provide reference for networked time service application.