一种鲁棒的基于射线跟踪的AOA目标定位算法

A Robust AOA Target Localization Method Based on Ray Trace

针对定位信号的多径传播和非视距噪声以及奇异方位线交点严重影响基于权值交点的AOA算法定位精度的问题,给出一种鲁棒的基于射线跟踪的AOA目标定位算法(RAOA-RT)。建立了微小区下的AOA定位模型,根据信号传播路径和镜像原理给出了镜像站的位置公式。所给RAOA-RT算法首先根据多径定位信号的跟踪结果构建镜像站,将NLOS径转化为到达镜像站的LOS径;其次,利用镜像站的AOA测量值形成相应的方位线,并获得所有方位线交点;最后,利用圆误差概率确定其中的有效交点,并依据有效交点的几何精度因子(GDOP)为其赋予相应的权值,对其进行加权求和作为目标的位置估计。仿真结果表明,与已有算法相比,RAOA-RT算法在不同应用场景下具有更高的定位精度,且其RMSE接近CRLB,鲁棒性更好。

Multipathpropagation and non-line of sight （NLOS） propagation of positioning signal, and singular bearing line intersection, seriously influence the positioning accuracy of weighted in- tersection methods for target localization using AOA（Angle of Arrival） paper, a method called robust AOA target localization method based on r proposed. We establish the AOA localization modelin mierocell. We get the image base stations （IBS） according to ray-tracing result of multipat measurements. In this ay trace （RAOA-RT） is the position formula of h positioning signal and the principle of mirror image. The proposed RAOA-RT method firstly constructs IBSs according to ray-tracing result of multipath positioning signal, and transforms the NLOS path to LOS path arriving at the IBS. Secondly, the method establishes bearing lines between the IBSs and the target by the AOA measurements at the IBSs, and gets all the intersections of bearing lines （IBL）. Finally, the effective IBLs are determined by circular error probable and distance between the IBLs. We can give the reasonable weight of every effective IBLs based on their geometric dilution of precision （GDOP）, and get an accurate estimate of target position by weighted merge all the effective IBLs of bearing lines. The simulation results show that RAOA-RT method is more accurate than other methods, and the RMSE of RAOA-RT method is much closed to the CRLB, and RAOA-RT method has better robustness in different application scenarios.