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

Smartphones with UWB: Evaluating the Accuracy and Reliability of UWB Ranging