System and method for performing time difference of arrival...

Details System and method for performing time difference of arrival... System and method for performing time difference of arrival...

2008-12-30

2009-10-27

Tarcza, Thomas H (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Directive

Beacon or receiver

C342S465000

Reexamination Certificate

active

07609207

ABSTRACT:
A method for performing Time Difference Of Arrival (TDOA) that eliminates the need for a common time base or clock calibration and a system for implementing the method. The method relies on a packet transmitted from a reference wireless device (first wireless device) with a known propagation delay between the first wireless device and a second device, which serves as a common reference point for all TDOA estimates. When a packet is received from a wireless device by the first wireless device and the second wireless device, the time difference of arrival is computed based on when the signal was received by the first device and the second device, using the known propagation delay to compensate for differences in clocks and frequencies between the first wireless device and the second wireless device.

REFERENCES:
patent: 6603978 (2003-08-01), Carlsson et al.
patent: 2005/0280578 (2005-12-01), Boyd
patent: 2007/0205944 (2007-09-01), Lyons
International Search Report dated Dec. 9, 2008 for International Application No. PCT/US07/62316.
Written Opinion dated Dec. 9, 2008 for International Application No. PCT/US07/62316.

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