Location beacon system
US6745036B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 15, 1999 |
| Grant date | Jun 1, 2004 |
| Priority date | — |
| Expiry date | Dec 15, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S5/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A location system for establishing the position of a portable terminal that transmits identity information indicative of the identity of the individual terminal is provided. The portable terminals transmit their identity information at a first predetermined power level. The system includes location beacons having a known position and the beacons are capable of receiving the identity information transmitted by the portable terminals. Each location beacon generates an output signal when identity information of a portable terminal is received at that beacon with a power level greater than a predetermined threshold value, which value may be set independently for each beacon. The output signal is indicative that such a portable terminal is within a particular distance range of the beacon and the output signal is made available to a control unit. By providing the control unit with information relating to the position of each of the location beacons, it is possible to establish the position of a particular portable terminal as being within a given range of that known beacon position when the beacon receives identity information associated with that portable terminal with a power level gre…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.