基于DVB-T单频网的无线定位方法研究

摘要

提出了一种基于地面数字电视广播单频网的定位方法，用于在城市密集城区和室内封闭区域等全球导航卫星系统信号较弱的地方提供辅助定位功能。该方法在初始化阶段通过GNSS计算出接收机当前位置，并以此来区分和锁定不同 DVB-T发射机的信号，实现热启动之后利用DVB-T信号导频子载波完成测距和定位。仿真实验表明：该方法在自由空间损耗模型下是可行的，并具有良好的效果。%In this paper,a positioning method based on DVB-T single frequency networks (SFN)is proposed,which can be used for assisted positioning in GNSS-blocked areas such as dense urban or indoor areas.This method first computes the receiver’s position by GNSS dur-ing an initialization phase,which launches a hot start to distinguish and lock the signals from different emitters.After that,ranging and positioning by processing the scattered pilot subcar-riers of DVB-T signals can be realized.Simulation results show that this method is feasible in the free space loss model and has good performance.