More and more consumer devices implement the IEEE Ultra-Wide Band (UWB) standard to perform distance measurements for sensitive tasks such as keyless entry and startup of modern cars, to find lost items using coin-sized trackers, and for smart payments. While UWB promises the ability to perform time-of-flight centimeter-accurate distance measurements between two devices, the accuracy and reliability of the implementation in up-to-date consumer devices have not been evaluated so far. In this paper, we present the first evaluation of UWB smartphones from Apple, Google, and Samsung, focusing on accuracy and reliability in passive keyless entry and smart home automation scenarios. To perform the measurements for our analysis, we build a custom-designed testbed based on a Gimbal-based platform for Wireless Evaluation (GWEn), which allows us to create reproducible measurements. All our results, including all measurement data and a manual to reconstruct a GWEn are published online. We find that the evaluated devices can measure the distance with an error of less than 20cm, but fail in producing reliable measurements in all scenarios. Finally, we give recommendations on how to handle measurement results when implementing a passive keyless entry system.

翻译：越来越多的消费设备采用IEEE Ultra-Wide Band（UWB）标准，用于执行诸如无钥匙进入和启动现代汽车、使用硬币大小的跟踪器查找丢失物品以及智能支付等敏感任务的距离测量。虽然UWB承诺能够在两个设备之间执行时飞行厘米级准确的距离测量，但更新的消费设备中实现的准确性和可靠性尚未得到评估。本文介绍了对苹果、谷歌和三星智能手机进行的UWB首次评估，重点关注被动无钥匙进入和智能家居自动化场景的准确性和可靠性。为了进行分析的测量，我们构建了一个基于Gimbal-based platform for Wireless Evaluation（GWEn）的自定义测试平台，使我们能够创建可复制的测量。我们的所有结果，包括所有测量数据和重建GWEn的手册，在线上发布。我们发现，经过评估的设备可以将距离测量误差控制在20厘米以下，但在所有场景下都无法产生可靠的测量结果。最后，我们对实现被动无钥匙进入系统时如何处理测量结果提出建议。