无线定位网络的联合功率带宽优化分析

Joint power bandwidth optimization of wireless location network

针对功率和带宽受限的无线定位网络的定位精度易受节点测距信号的发射功率和有效带宽的影响的问题,提出一种无线定位网络联合功率带宽优化分配的算法:引入均方位置误差下限作为网络定位精度的评价标准,形成一个采用超宽带测距技术进行定位的无线定位网络,并将协同定位的思想引入定位网络;同时建立无线定位网络均方位置误差下限与节点发射功率和有效带宽的函数模型;将功率带宽优化问题建模为一个非凸优化的问题,采用粒子群算法进行求解。仿真结果表明,该算法可以降低定位网络的均方位置误差下限,从而有效提高定位网络的定位精度。

Aiming at the problem that it is easy to be affected by the transmitting power and the effective bandwidth of the agents for the positioning accuracy of the wireless location network with limited power and bandwidth,the paper proposed a joint power bandwidth optimization of wireless location network:the square position error bound was introduced as the standard of positioning accuracy,and the wireless positioning network with thought of cooperative localization was formed by ultra-wideband ranging technology,then a function model of the square position error bound of the wireless location network,the transmitting power and effective bandwidth of the agents was explored,finally the power bandwidth optimization was modeled as a non-convex optimization through using the particle swarm optimization algorithm.Experimental result showed that the proposed method could reduce the square position error bound of the network,so as to effectively improve the positioning accuracy.