Title:
SELF CALIBRATION OF SIGNAL STRENGTH LOCATION SYSTEM
Document Type and Number:
WIPO Patent Application WO2004106964
Kind Code:
A3
Abstract:
A system for locating mobile units in a data communications system based on signal strength measurements of mobile unit transmissions is calibrated for variations in mobile unit transmitter power by determining range of a mobile unit from an access point using two way time ranging. The time ranging is compared to the value for range based on signal strength and a correction value for the mobile unit is updated based on the difference between range based on time ranging and the range based on signal strength.
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Inventors:
ZEGELIN CHRIS (US)
GOREN DAVID P (US)
GOREN DAVID P (US)
Application Number:
PCT/US2004/016161
Publication Date:
May 26, 2006
Filing Date:
May 24, 2004
Export Citation:
Assignee:
SYMBOL TECHNOLOGIES INC (US)
ZEGELIN CHRIS (US)
GOREN DAVID P (US)
ZEGELIN CHRIS (US)
GOREN DAVID P (US)
International Classes:
G01S5/14; H04Q7/00; G01S; (IPC1-7): H04B17/00
Foreign References:
| US20030034851A1 | 2003-02-20 | |||
| US6259912B1 | 2001-07-10 | |||
| US6014102A | 2000-01-11 | |||
| US6240124B1 | 2001-05-29 |
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