5G/GNSS融合系统定位精度仿真分析

Positioning accuracy analysis for 5G/GNSS fusion system

全球导航卫星系统(global navigation satellite system,GNSS)在室内或室内外交界处等多径干扰的复杂环境下伪距测量精度不高,定位精度不佳,甚至无法定位.第5代通信系统(5G)是我国目前大力发展的移动通信系统,其特征在于基站密度高,室内外覆盖性强,通信带宽大,因此具备精确测量基站与用户终端相对距离的潜力.融合5G与GNSS信号进行定位,可有效解决GNSS覆盖性不足、城市峡谷定位精度低等问题.本文通过对不同场景下的多径干扰进行定量分析,使用蒙特卡洛仿真的方法论证了几种典型的多径干扰条件下5G/GNSS融合系统的水平定位性能上下限.仿真结果表明,在室内或室内外交界处等多径干扰严重的环境下,室内布设足够的5G基站并融合5G带内资源后可以使定位精度达到亚米级.

Global navigation satellite system(GNSS)is characterized with low pseudo-range measurement accuracy,poor positioning accuracy and even inability to locate in the environment with complex multipath interference such as indoor or indoor/outdoor junction.The fifth-generation communication system(5G)has been greatly developed in China.For it's high density of base station,strong indoor and outdoor coverage,large communication bandwidth,it has the potential to accurately measure the relative distance between the base station and the user terminal.Integrating 5G and GNSS signals to realized positioning can effectively solve the problems of insufficient GNSS coverage and law positioning accuracy of urban canyon.In this paper,based on quantitative analyses of multipath interference in different scenarios,Monte Carlo simulation is used to demonstrate upper and lower limits of horizontal positioning performance of 5G/GNSS fusion systems under several typical multipath interference conditions.Simulation results show that the positioning accuracy can reach sub-meter levels by using 5G in-band resources in indoor or indoor-outdoor boundary multi path severe environments.