Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2005-04-05
2005-04-05
Trinh, Sonny (Department: 2687)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S456500, C455S404200, C455S115100, C342S378000, C342S108000, C342S107000, C342S145000
Reexamination Certificate
active
06876859
ABSTRACT:
A method, used in locating a mobile transmitter, includes providing a set of cross-correlation values, wherein each cross-correlation value is associated with a corresponding TDOA and/or FDOA estimate and is produced by cross-correlating a reference signal with a cooperating signal. The reference signal comprises a copy of a signal transmitted by the mobile transmitter as received at a first antenna and the cooperating signal comprises a copy of the same signal as received at a second antenna. The method further includes determining a most likely range of TDOA and/or FDOA estimates, and then identifying an optimal cross-correlation value within a subset of cross-correlation values corresponding to the most likely range of TDOA and/or FDOA estimates. The TDOA and/or FDOA value corresponding to the optimal cross-correlation value is then employed in calculating the location of the mobile transmitter.
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Anderson Robert J.
Rogers Alan E. E.
Stilp Louis A.
Massachusetts Institute of Technology
Phan Huy
Trinh Sonny
TruePosition, Inc.
Woodcock & Washburn LLP
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