基于5G的通导融合位置认证系统性能分析

随着无人化智能移动装备在工业、交通等安全敏感领域的普及应用,民用导航定位系统中的定位安全问题日益突出。位置认证是对终端的物理位置声明进行认证的过程,是导航定位安全技术的重要组成部分。基于第五代(5G)移动通信网络的通导融合位置认证系统具有覆盖范围广、认证精度高、用户容量大、建设运维成本低等多重优势。本文首先介绍了多基站位置认证系统的检测判决原理,提出了漏检平均距离的定义作为位置认证系统精度的量化评价指标。在此基础上,通过数值仿真分析了信号带宽、基站同步误差、信噪比对位置认证系统精度的影响,并利用5G信道模型评估了典型场景下的位置认证系统的性能。结果表明,在具备3个以上的视距基站时,基于5G的通导融合位置认证系统可以实现米级的位置认证精度。

Performance Analysis of Position Verification System in 5G-based Integrated Communication and Navigation Networks

With the increasingly popular usage of unmanned smart equipment in safety-sensitive areas such as industrial and transportation sectors,the security of civil navigation and positioning systems has become a critical issue.Position verification(PV)is the process of authenticating the location declared by a terminal,it is an important building block for the security of navigation and positioning systems.The PV system based on the fifth-generation(5G)mobile communication network has multiple advantages such as wide coverage,high precision,large user capacity and low maintenance cost.This paper first introduces the principle of 5G-based PV system as a statistical detection problem.A new metrics called average distance of missed detection(ADMD)is proposed to evaluate the precision of PV systems.Furthermore,we analyze the impact of signal bandwidth,base station(BS)synchronization error and signal-to-noise ratio(SNR)on the accuracy of PV systems.Finally,realistic 5G channel models are used to evaluate the performance of the PV system in typical urban outdoor scenarios.The analysis shows that the 5G-based system can achieve meter-level PV accuracy if the mobile node has line-of-sight links with more than three BSs.