IR-UWB定位系统距离误差建模及性能研究

摘要

The multipath and NLOS distance errors in indoor positioning due to the propagation characteristics of IR-UWB were analyzed, based on the coherent TOA ranging algorithm. Utilized the statistical information of IEEE 802.15.4a channel model, the multipath error was modeled in terms of system bandwidth in both LOS and NLOS environment. And the NLOS extra distance error was derived in terms of obstacle thickness, transceiver distance and the incidence angle as the IR-UWB signal propagated through walls. The positioning performance via triangulation was analyzed as given the prior information of the NLOS distance error in completely NLOS environment.%基于相干TOA测距算法,研究了IR-UWB无线室内定位系统中由脉冲信号传播特性导致的多径误差和NLOS误差的建模问题.首先利用IEEE 802.15.4a信道模型中的多径信息给出了与系统带宽有关的多径距离误差分布参数.结合IR-UWB信号穿墙传播几何结构,理论推导了穿墙额外传播时延导致的几何距离误差限.对完全NLOS环境下定位的仿真结果表明,利用NLOS距离误差信息直接对TOA测距结果的修正可以显著提高定位精度.