超宽带技术下基于软两步法的目标定位

Target Localization Based on Soft Two-step Method in Ultra-wideband Technology

摘要:

针对采用超宽带技术的目标定位问题进行了研究，提出了直接估计目标位置及其改进的软两步法的定位方案；首先通过对超宽带信号模型和基于到达时间的典型两步定位方案原理的分析，提出了一种采用一组测量值或一组可能的ToA估计量直接估计目标节点位置的方案；为了消除该方案中阈值选择时存在的模糊性和强多径分量，提出了基于多ToA的定位方案，从而实现对目标节点的跟踪定位；仿真实验结果表明，提出的定位方案相比于典型的两步定位方案无论是在视距场景还是非视距场景中都具有更高的目标跟踪能力和更小的定位误差累计分布函数。

Abstract:

Aiming at the problem of target location using ultra-wideband technology, a locating scheme, where the direct estimation of target location and its improved soft two-step method is implemented, is proposed. Firstly, by analyzing the ultra-wideband signal model and the principle of typical two-step locating scheme based on time of arrival(ToA), a scheme to directly estimate the location of target nodes using a set of measurements or a set of possible ToAs estimators is proposed. In order to eliminate the ambiguity and strong multipath components in the threshold selection of that scheme , a locating scheme based on multi-ToAs is proposed to realize the tracking and locating of target nodes. The simulation results show that,compared with the typical two-step locating scheme, the proposed locating scheme has higher tracking ability and smaller cumulative distribution function of locating errors in both line-of-sight and non-line-of-sight scenarios.