RF tracking system and method
US7019663B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 8, 2002 |
| Grant date | Mar 28, 2006 |
| Priority date | — |
| Expiry date | Jun 6, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S5/0036
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Described is a system and method for tracking an asset. The system may include an RF tag coupled to the asset; a wireless wide area network (“WWAN”) including a plurality of transceivers and having a first coverage area; and a plurality of wireless local area networks (“WLAN”). Each of the WLANs has a second coverage area within the first coverage area. In addition, the system includes a computer which communicates with the WWAN and the WLANs. The computer generates a signal to be transmitted to the asset using a first transceiver of the WWAN. The asset receives the signal and generates a response signal; the asset transmits the response signal to a particular WLAN within which second coverage area the asset is located via a plurality of second transceivers. The computer determines the location of the asset within the second coverage area as a function of the response signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.