The use of mobile phones while driving is a major source of distraction for vehicle drivers and has resulted in a large number of car accidents. While surveillance cameras can be used to detect the violation of phone use, they do not work well in some scenarios (e.g., darkness and blockage) and may raise privacy concerns. In this paper, we present PhoLoc, a roadside device to detect the violation of phone use in personal vehicles using the cellular signals emitted by cellphones. PhoLoc is equipped with two sensors: a multi-antenna radio receiver and a low-cost lidar. It jointly processes the multimodal data from the two sensors to estimate the relative location of a phone in a vehicle. The enabler of PhoLoc is a new near-field localization scheme, which is capable of estimating the location of a moving phone at a specific time moment by overhearing its cellular signals. We have built a prototype of PhoLoc and evaluated its performance in realistic scenarios. Experimental results show that PhoLoc achieves 4.2% false positive rate and 13.8% false negative rate in the detection of phone call violation.

中文翻译：

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司机正在打电话吗？使用蜂窝信号的移动设备定位


驾驶时使用手机是车辆驾驶员分心的主要来源，并导致大量车祸。虽然监控摄像头可用于检测手机使用的违规行为，但它们在某些情况下（例如黑暗和堵塞）效果不佳，并且可能会引起隐私问题。在本文中，我们介绍了 PhoLoc，这是一种路边设备，可利用手机发出的蜂窝信号来检测私家车中使用手机的违规情况。 PhoLoc 配备了两个传感器：一个多天线无线电接收器和一个低成本激光雷达。它联合处理来自两个传感器的多模态数据，以估计手机在车辆中的相对位置。 PhoLoc 的推动者是一种新的近场定位方案，它能够通过监听移动电话的蜂窝信号来估计移动电话在特定时间的位置。我们构建了 PhoLoc 原型并评估了其在现实场景中的性能。实验结果表明，PhoLoc 在电话违规检测中实现了 4.2% 的误报率和 13.8% 的漏报率。