Method for estimating relative clock frequency offsets to...

Details Method for estimating relative clock frequency offsets to... Method for estimating relative clock frequency offsets to...

2011-06-28

2011-06-28

Ryman, Daniel J (Department: 2466)

Multiplex communications

Communication over free space

Combining or distributing information via time channels

C342S458000

Reexamination Certificate

active

07969963

ABSTRACT:
A method and system improves two-way radio ranging accuracy by estimating a relative clock frequency offset between a first clock X of a first transceiver and a second clock Y a second transceiver. The first transceiver transmits a first packet at time t0received by the second transceiver at a time t1. The second transceiver transmits a second packet at a time t2received by first transceiver at a time t3. The second transceiver transmits a third packet at a time t4received at a time t5. The relative clock frequency offset is thenΔ⁢⁢fXY′≅2⁢⁢f⁡(N24Y-N35X)N24Y+N35X,where f is a nominal clock frequency of the first and second clocks, NY24is a measured first delay between times t2and t4of the second clock, NX35is a measured second delay between times t3and t5of the first clock X.

REFERENCES:
patent: 4860287 (1989-08-01), Kelly
patent: 6327274 (2001-12-01), Ravikanth
patent: 2007/0143105 (2007-06-01), Braho et al.
patent: 2007/0200759 (2007-08-01), Heidari-Bateni et al.
patent: 2007/0286121 (2007-12-01), Kolakowski et al.
patent: 2008/0284639 (2008-11-01), Sahinoglu
U.S. Appl. No. 11/749,517, filed Jun. 30, 2007, Sahinoglu.

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