一种实现建筑物内应答器定位跟踪的新方法

New method for locating and tracing transponder inside buildings

针对建筑物内携带应答器目标的定位跟踪问题,提出了一种新的方法,将通过无线测量技术得到的每条射线的无线测量值如到达角、到达时间和功率作为后向射线跟踪的输入来实现。首先,对于每个到达,分别计算出沿后向跟踪射线路径上的任意点的功率,这个功率值是到达角(Ao A)和到达时间(To A)的函数;其次,根据全部后向射线跟踪功率相等并具有相同的生成时间来确定出应答器的候选位置;最后,根据对应答器候选位置建立度量指标,选取具有最高加权指标和的候选位置,从而实现对应答器目标的定位跟踪。基于在某院校实验大楼内的一个应答器的实验结果表明,接收器能够将应答器目标定位到较高的精度,而且在各种信道和传播条件下的定位结果表明,定位预测误差主要依赖于接收器天线的角分辨率,相比于其他基于单一无线测量值的RF技术定位方法,所提出的方法有更小的定位误差。

Aiming at the problem of locating and tracing targets that carrying transponders inside buildings,a new method is proposed in this paper,which is done by the wireless measurements of each ray obtained by wireless measurement technology,such as angle of arrival( Ao A),time of arrival( To A) and power,for generating the inputs of backward ray tracing. The concrete algorithm implement consists of three steps,firstly,for each arrival,the power of any point along the back traced ray path is calculated respectively,and this power value is a function of Ao A as well as To A. Secondly,the candidate locations of the transponder are determined according to all backward ray traced power equal to each other and having the same generation times. Finally,according to the establishment of the metrics for the candidate locations of the transponder,the candidate location with the highest weighted sums of the metrics is selected to locate and trace the transponder target. The experimental results based on a transponder inside an experimental building located in a college show that the receiver can locate the transponder target with high accuracy. Moreover,the localization results under various channel and propagation conditions show that the location prediction error mainly depends on the angular resolution of the receiver antenna,and compared with other RF technology localization methods based on the single wireless measurement,the proposed method has smaller positioning error.