Definition
A short-range radio technology that transmits very short pulses spread across a wide slice of spectrum, enabling precise time-of-flight distance and position measurement substantially more accurate than conventional narrowband positioning techniques provide.
Key Points
- Transmits extremely short pulses spread across a wide bandwidth, rather than concentrating transmitted energy in a narrow frequency band the way conventional narrowband radio does
- Enables precise time-of-flight distance measurement between devices, since the short pulse duration allows very fine-grained timing resolution that translates directly into precise distance calculation
- Achieves positioning accuracy — commonly centimeter-level — that substantially exceeds what conventional Wi-Fi or Bluetooth-based positioning techniques typically provide, making it suitable for applications requiring fine-grained location precision
- Operates effectively over short range, typically tens of meters at most, positioning it as a complement to rather than a replacement for wider-area positioning and connectivity technologies
- Particularly valuable specifically indoors or in other GNSS-denied or GNSS-degraded environments, where satellite positioning doesn't reliably reach but precise local positioning is still operationally needed
Concept
A UWB positioning system measures how long a very short radio pulse takes to travel between two devices, and because the pulse itself is so brief, that timing measurement can be extremely precise — translating directly into distance and position calculations accurate to a few centimeters, a level of precision conventional Wi-Fi or Bluetooth signal-strength-based positioning techniques generally cannot match given their comparatively coarse timing resolution.
Explainer
The precision advantage UWB delivers matters specifically in exactly the scenarios where GNSS cannot help at all — indoor environments, dense urban canyons, or other GNSS-denied or degraded conditions — since UWB's short-range, device-to-device time-of-flight measurement doesn't depend on satellite signal reception the way GNSS and GNSS-augmentation techniques like differential GNSS fundamentally do. This is why UWB has found a specific, valuable niche complementing rather than competing with GNSS-based positioning broadly: GNSS and its accuracy-enhancing techniques serve outdoor, wide-area positioning needs, while UWB fills the indoor and short-range precision gap those techniques cannot reach at all. For CE verticals, UWB positioning is directly relevant wherever precise indoor or short-range location tracking matters — asset tracking within a warehouse or industrial facility, precise geofencing around specific equipment or hazard zones, and personnel location tracking in enclosed industrial environments all benefit from UWB's precision in exactly the GNSS-denied indoor contexts where satellite positioning alone cannot provide adequate accuracy.
Cite this entry
Ultra-Wideband. ConnectedEarth Knowledge Base. https://connectedearth.space/knowledge-base/ultra-wideband/ (updated 13 September 2026).