Ultra-Wideband

A short-range radio-frequency technology that uses very wide frequency bands (typically above 500 MHz) and very short pulses to enable centimetre-accurate distance and angle-of-arrival measurements between paired devices. UWB is increasingly used in accessibility for indoor positioning, including blind-pedestrian navigation, person-following robots that need to track a specific user or guide in a crowd, and asset-finder applications. Compared with Bluetooth Low Energy beacons, UWB offers much higher spatial precision and is less affected by signal occlusion by human bodies; compared with computer-vision tracking, UWB does not depend on lighting or line-of-sight images. UWB is now built into recent flagship smartphones (Apple U1/U2, Samsung, Google) and many wearables.