摘要
全球导航卫星系统(Global Navigation Satellite System,GNSS)是目前应用最广泛的导航系统之一,但导航卫星信号到达地面时比较微弱,容易受到干扰,且无法在室内和城市峡谷环境中使用。近年来,移动通信技术发展迅速,具有基站布站密度高、信号信噪比强的特点,常被作为机会信号(Signal of Opportunity,SOP)定位导航系统进行研究。5G移动通信采用极简化设计,用于信道质量估计的参考信号不能随时获取,限制了利用上述信号实现SOP定位可能性。针对以上问题,结合5G移动通信中的波束成形技术,充分利用5G新引入的同步信号块(Synchronization Signal Block,SSB)中的解调参考信号(Demodulation Reference Signal,DMRS),提出了基于5G参考信号的测距测向方法,实现了多径误差补偿的测距技术和基于信噪比拟合的测向技术。实验表明,测距均方根误差(Root Mean Square Error,RMSE)为21.3 m,比不使用DRMS时的精度提高了46.1%;测向RMSE为7.9°,使得未来利用5G移动通信参考信号构建SOP定位导航系统成为可能。
Global Navigation Satellite System(GNSS)is one of the most widely used navigation systems at present.However,the navigation satellite signal is weak when it reaches the ground,making it easily to be interfered and cannot be used in indoor and urban canyon environments.In recent years,mobile communication technology is developing rapidly,which has the characteristics of high density of base stations and strong SNR of signals.It is widely studied by researchers as navigation and positioning system for Signal of Opportunity(SOP).However,5G mobile communication adopts an ultra-lean design,and the reference signals used for channel quality estimation are transmitted on demand,which limits the possibility of using them in an SOP positioning system.To solve the above problems,combined with the beamforming technology in 5G mobile communication as well as taken full advantage of the Demodulation Reference Signal(DRMS)in the synchronization Signal Block(SSB)introduced by 5G,a ranging and detection-finding method based on 5G reference signal is proposed,realizing the ranging technology with multipath mitigation compensation and the Direction-finding method based on SNR fitting.Experiment shows that the Root Mean Square Error(RMSE)of ranging is 21.3 m,which is 46.1% higher than that without DRMS signal;while the RMSE of direction-finding is 7.9°,which makes it possible to use 5G reference signals to setup an navigation and positioning system for SOP in future.
作者
金天
姚钧天
刘波
吴笑风
JIN Tian;YAO Juntian;LIU Bo;WU Xiaofeng(School of Electronic Information and Engineering,Beihang University,Beijing 100191,China;Beijing Highlander Digital Technology Co.,Ltd.,Beijing 100095,China)
出处
《无线电工程》
北大核心
2023年第12期2834-2841,共8页
Radio Engineering
基金
国家自然科学基金(62071020)。
关键词
测距
测向
5G参考信号
导航定位
ranging
direction-finding
5G reference signal
navigation and positioning
