基于单次反射的井下单基站DOA和TOA定位方法

针对井下巷道单基站定位系统中无线信号受多径效应、非视距传播影响导致定位误差较大的问题,提出了一种基于单次反射的到达方向(DOA)和到达时间(TOA)的联合估计定位方法。该方法利用视距路径和多条单次反射路径的TOA估计值构建以基站原点和单次反射点为焦点的双曲线,利用DOA估计值构建直线,从而建立含有连续位置信息的二元多次估计方程组,通过计算直线与双曲线的交点得到移动目标的精确位置。仿真结果表明,该方法较视距直接定位方法的定位精度有较大提高,且当单次反射路径为3条时即可达到较高的定位精度。

Underground positioning method of single base station DOA and TOA based on single reflection

In view of problem of big error in underground single base station positioning system due to wireless signal influenced by multipath effect and non-line of sight,ajoint estimation positioning method of DOA and TOA based on single reflection was proposed.The method constructs two hyperbolic trajectories which takes base station point and single reflection point as focus by use of TOA estimation of line-of-sight path and multiple single reflection paths,constructs linear line by use of DOA estimation,so as to get binary multiple estimation equation set which contains continuous location information,and obtains precise location of mobile target through calculating intersection of linear line and hyperbola.The simulation results show that the method achieves higher positioning accuracy than line-of-sight direct positioning method with three single reflection paths.