Geo-location of a WLAN device using mobile monitoring station
US9921294B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 26, 2016 |
| Grant date | Mar 20, 2018 |
| Priority date | — |
| Expiry date | Oct 17, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S5/06
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A passive geo-location scheme of Wi-Fi access points is described using one or more mobile measuring stations. The methods and arrangements herein relate to, in one embodiment, using the TSF timer in beacons received by the measuring station, the reported TODs, the TOAs measured by the measuring station and synchronization between the timers of the wireless device and the measuring station. The synchronization includes applying a factor α for correcting the timer associated with the measuring station when the measuring station receives the beacons, applying a factor β for correcting a ratio of timer rates between the timer associated with the wireless device and the timer associated with the measuring station, and applying a factor γ for correcting changes in a timer rate ratio between the first timer associated with the wireless device and the timer associated with the measuring station.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.