发明名称 |
Location beacon system |
摘要 |
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 greater than the beacon threshold value. In one embodiment the portable terminals are DECT handsets.
|
申请公布号 |
US6745036(B1) |
申请公布日期 |
2004.06.01 |
申请号 |
US19990464005 |
申请日期 |
1999.12.15 |
申请人 |
KONINKLIJKE PHILIPS ELECTRONICS N.V. |
发明人 |
DUNNE FRANK;FORDE BRIAN J.;WEINMANN PAUL C.;SMAAK MARC |
分类号 |
G01C21/00;G01S5/00;G01S5/08;H04W64/00;(IPC1-7):H04Q7/20 |
主分类号 |
G01C21/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|