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 .