限制环境下的GNSS精密授时方法研究综述

A review of GNSS precision timing method in restricted environments

GNSS精密授时技术在国防军事领域得到了广泛的应用,但卫星导航信号具有先天的脆弱性,极易受到各种有意和无意干扰,为了提升GNSS精密授时的稳健性和安全性,亟需发展限制环境下的授时技术。介绍了GNSS授时应用存在的问题,分析了GNSS精密授时方法研究现状,给出了在无地面通信网络条件下利用北斗三号PPP-B2b信息进行实时PPP授时,在信号遮挡条件下利用惯性导航辅助PPP瞬时重新收敛和附加钟差模加快PPP重新收敛,以及在复杂电磁环境下利用多阵元抗干扰天线提高GNSS授时性能的发展对策建议,为拓展GNSS授时技术在时频领域的应用提供借鉴。

GNSS precision timing technology is widely used in the national defense and military fields,but satellite navigation signals are inherently vulnerable to all kinds of intentional and unintentional interference.In order to improve the robustness and security of GNSS precision timing,it is urgent to develop timing technology under restricted environment.The problems existing in the application of GNSS timing are introduced,the research status of GNSS precision timing method is analyzed in this paper.The recommendations for development reponses are also presented,including using the Beidou-3 PPP-B2b information for real-time PPP timing under the condition of no ground communication network,using the inertial navigation to assisted PPP instantaneous re-convergence and the additional clock difference mode to accelerate PPP re-convergence under the signal occlusion condition,and using the multi-array anti-jamming antenna to improve GNSS timing performance under the complex electromagnetic environment.It provides a reference for expanding the application of GNSS timing technology in time frequency field.