Title:
ENHANCED LOCATION METHODOLOGY FOR A LOCATION SYSTEM
Document Type and Number:
WIPO Patent Application WO2003003040
Kind Code:
A3
Abstract:
A first device (100) transmits a first signal to a second device (300) at a first time. A third device (110) detects a second signal from the second device (300) at a second time. The second signal was transmitted in response to detection of the first signal. Based on the first and second times, a sum of a first propagation delay (200) and a second propagation delay (210) is estimated. The first propagation delay (200) is between the first device (100) and the second device (300), and the second propagation delay (210) is between the second device (300) and the third device (110). The sum of the first and second propagation delays (200, 210) is then used to estimate a location of the second device (300).
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Inventors:
JOHNSON MARK J
Application Number:
PCT/US2002/018554
Publication Date:
July 17, 2003
Filing Date:
May 13, 2002
Export Citation:
Assignee:
MOTOROLA INC (US)
International Classes:
G01S5/12; (IPC1-7): G01S3/02; G01S1/24
Foreign References:
| US3646580A | 1972-02-29 | |||
| US3665464A | 1972-05-23 | |||
| US5097269A | 1992-03-17 | |||
| US3150372A | 1964-09-22 |
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