基于圆盘散射体的非视距定位算法

针对无线传感器网络目标定位中的非视距问题,为了抑制非视距误差,提高定位精度,提出一种基于圆盘散射体的非视距定位算法.新算法根据基站收到的多径到达时间,计算加权测量均值,与圆盘散射体模型理论均值进行匹配,建立目标函数,同时引入圆盘半径约束,通过对目标函数求取极值,解出含有目标位置的最优解.仿真实验结果表明,与其他目标定位算法相比,该算法能够得到全局最优解,提高非视距环境下的定位精度.

NLOS Mitigation Location Method Based on Scatterers Model

To address the non-line-of-sight(NLOS) issue in the field of target location of wireless sensor network, a target location algorithm based on the disk of scatterers model in NLOS environment is proposed to mitigate the NLOS error. The new algorithm utilizes the weighted measurement mean value of the measurements of multipath time of arrives received by base stations and matches it to the theoritical mean value of the disk of scatterers model to establish the target function. Meanwhile, disk radius constraint is introduced to the target function. Through searching the extreme value of target function, an optimal solution contains the location of target can be obtained. Simulation experiments show that compared with other target location algorithms, the presented algorithm can obtain the global optimal solution and improve the positioning accuracy under NLOS environment.