基于单次反射的井下单基站DOA和TOA定位方法
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摘要
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。
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.
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.
引文
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[10]翟彦蓉,黄欢,张申,等.基于DOA和TDOA的井下定位算法研究[J].工矿自动化,2013,39(11):57-60.
[2]孙继平,李晨鑫.基于TOA技术的煤矿井下人员定位精度评价方法[J].煤炭科学技术,2014,42(3):66-68.
[3]刘鹏,张国鹏,杨小冬,等.基于UWB的井下无线传感网信道模型研究[J].武汉理工大学学报,2011(6):139-143.
[4]魏小丽,陈建,林琳.基于空间平滑算法的二维相干源DOA估计[J].吉林大学学报:工学版,2008,38(5):1160-1164.
[5]CAREVIC D.Automatic estimation of multiple target positions and velocities using passive TDOA measurements of transients[J].IEEE Transactions on Signal Processing,2007,55(2):424-436.
[6]XU E Y,ZHI D,DASGUPTA S.Source localization in wireless sensor networks from signal time-ofarrival measurements[J].IEEE Transactions on Signal Processing,2011,59(6):2887-2897.
[7]吴绍华,张钦宇,张乃通.UWB无线传感器网络中基于匹配滤波检测的TOA估计[J].软件学报,2009,20(11):3010-3022.
[8]ALSINDI N,LI Xinrong,PAHLAVAN K.Analysis of time of arrival estimation using wideband measurements of indoor radio propagations[J].IEEE Transactions on Instrumentation and Measurement,2007,56(5):1537-1545.
[9]刘琚,李静.一种在非视距环境中的TDOA/AOA混合定位方法[J].通信学报,2005,26(5):63-68.
[10]翟彦蓉,黄欢,张申,等.基于DOA和TDOA的井下定位算法研究[J].工矿自动化,2013,39(11):57-60.