Accidents between battery-operated vehicles and pedestrians are expected to increase as electric vehicles (EV) or plug-in hybrid vehicles (PHV) are widely used in near future because of small ambient noise of EV/PHV. To prevent such accidents, a portable alert system for pedestrians to detect approaching vehicle is proposed in this paper. The alert system exploits ultra-wideband impulse radio (UWB-IR) for accurately measuring a distance between a portable mobile terminal and a target vehicle, which is measured using a two-way time-of-arrival (TOA) method. The mobile terminal implements a prototype GUI for alerting the user from an approaching vehicle. Field experiments have been conducted using real UWB-IR devices when the target vehicle is stationary and moving at a constant speed, to evaluate accuracy and precision of the proposed alert system. Experimental results show that the proposed system achieves 30 cm accuracy and 1 m precision while the vehicle runs at 30 km/h.
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机译：随着电动汽车（EV）或插电式混合动力汽车（PHV）在不久的将来被广泛使用，电动汽车和行人之间的事故预计会增加，这是因为EV / PHV的环境噪声较小。为了防止此类事故的发生，本文提出了一种便携式警报系统，用于行人检测正在接近的车辆。该警报系统利用超宽带脉冲无线电（UWB-IR）来精确测量便携式移动终端与目标车辆之间的距离，该距离是使用双向到达时间（TOA）方法进行测量的。该移动终端实现原型GUI，以警告用户正在接近的车辆。当目标车辆静止且以恒定速度行驶时，已经使用真实的UWB-IR设备进行了现场实验，以评估所提出警报系统的准确性和精度。实验结果表明，该系统在车辆以30 km / h的速度行驶时可达到30 cm的精度和1 m的精度。
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