SteerTrack: Acoustic-Based Device-Free Steering Tracking Leveraging Smartphones

Xiangyu Xu, Jiadi Yu, Yingying Chen, Yanmin Zhu, Minglu Li
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引用次数: 14

Abstract

Given the increasing popularity, mobile devices are exploited to enhance active driving safety nowadays. Among all safety services provided for vehicles, tracking the rotation angle of steering wheel in real time can monitor the vehicles' dynamics and drivers' behaviors at the same time. In this paper, we propose a steering tracking system, SteerTrack, which tracks the rotation angle of steering wheel in real time leveraging audio devices on smartphones. SteerTrack seeks a device-free approach for steering tracking without requiring installation of specialized sensors on steering wheels nor asking drivers to wear sensors on their wrists. Since the steering wheel is operated by a driver's hands, the rotation angle of steering wheel can be tracked based on movements of the driver's hands. SteerTrack first builds an acoustic signal field inside of a vehicle and then analyzes the echoes reflected from the driver's hands with relative correlation coefficient(RCC) and reference frame to track the movement trajectory of hands under different steering maneuvers. Given the tracked movement trajectory, SteerTrack further develops a geometrical transformation-based method for estimating the rotation angle of steering wheel in 3D driving environments by projecting the steering wheel to a 2D ellipse. Through extensive experiments in real driving environments with 5 volunteers for several weeks, SteerTrack can achieve an average error of 4.61 degree for estimating the rotation angle of steering wheel.
SteerTrack:基于声音的无设备转向跟踪利用智能手机
随着汽车的日益普及,移动设备被用来提高主动驾驶的安全性。在为车辆提供的所有安全服务中,实时跟踪方向盘的旋转角度可以同时监控车辆的动态和驾驶员的行为。在本文中,我们提出了一种转向跟踪系统,SteerTrack,它利用智能手机上的音频设备实时跟踪方向盘的旋转角度。SteerTrack寻求一种不需要在方向盘上安装专门传感器,也不要求司机在手腕上佩戴传感器的无设备转向跟踪方法。由于方向盘是由驾驶员的手来操作的,因此可以根据驾驶员的手的运动来跟踪方向盘的旋转角度。SteerTrack首先在车内建立声信号场,然后利用相对相关系数(relative correlation coefficient, RCC)和参考系对驾驶员手部反射回波进行分析,跟踪驾驶员手部在不同转向动作下的运动轨迹。基于跟踪的运动轨迹,SteerTrack进一步开发了一种基于几何变换的方法,通过将方向盘投影到二维椭圆上来估计3D驾驶环境中方向盘的旋转角度。通过5名志愿者在真实驾驶环境中进行数周的广泛实验,SteerTrack对方向盘转角的估计平均误差为4.61度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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