基于时间反演的到达时间定位

Time of arrival positioning based on time reversal

针对传统算法在室内超宽带(UWB)到达时间(TOA)定位系统里很难准确搜寻出第一条直射路径,从而导致定位精度不高的问题,提出了基于时间反演(TR)的TOA室内UWB定位算法。首先,利用TR处理的空时聚焦特性确定第一条直射路径,从而估计这条路径的TOA;其次,通过加权最小二乘(WLS)定位算法对不同的估计分量赋予相应的权值以提高定位精度。仿真结果表明,相较传统TOA定位,所提方案在低信噪比条件下的均方根误差(RMSE)减小了28.6%,可见该方案有效提升了系统定位精度。

It is difficult for traditional algorithms to accurately find out the first direct path in indoor Ultra Wide Band(UWB)Time Of Arrival(TOA)positioning system,resulting in low positioning accuracy.In order to solve the problem,a TOA indoor UWB positioning algorithm based on Time Reversal(TR)was proposed.Firstly,the spatial-temporal focusing characteristic of TR processing was used to determine the first direct path,so as to estimate the TOA of this path.Then,the Weighted Least Squares(WLS)positioning algorithm was used to assign the corresponding weights to different estimation components for improving the positioning accuracy.The simulation results show that,compared with the traditional TOA positioning,the proposed scheme has the Root Mean Square Error(RMSE)reduced by 28.6%under the low signal-to-noise ratio condition.It can be seen that the proposed scheme improves the system positioning accuracy significantly.