Devices such as tablets and smart displays can be automatically unlocked when a user carrying a compatible wearable device approaches. With user permission, the event of the user being in close proximity is detected, and the user is authenticated by communicating with the wearable device using ultra-wideband (UWB) radio. However, UWB ranging can suffer from front-back ambiguity such that the detection of the presence of a user that is behind the device can unlock the device, which can lead to security and/or privacy risk. This disclosure discloses a two-pronged approach to user identification, user authentication, and front-back disambiguation during automatic unlocking of a device using UWB radio. UWB radio is used to achieve handshaking and user-profile identification. Radar is used to provide front/back information. False positives are avoided by authenticating the user when a difference between the distances reported by radar and by UWB are within a threshold.
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Zou, Xiating and Lee, Cheng-Jung (CJ), "Device Identification and Authentication with Radar and UWB Ranging", Technical Disclosure Commons, (April 13, 2023)