Method for reducing radio ranging errors due to clock...

Details Method for reducing radio ranging errors due to clock... Method for reducing radio ranging errors due to clock...

2007-05-16

2008-12-09

Phan, Dao L (Department: 3662)

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

Directive

Position indicating

C342S442000

Reexamination Certificate

active

07463194

ABSTRACT:
A method reduces errors in two-way ranging between transceivers due to a frequency offset. A first transceiver measures a time CA1between transmitting a request frame and receiving a reply frame, and a time CA2between receiving a first information bit of the reply frame and receiving a last information bit of the reply frame. A second transceiver measures a time CB2between receiving the request frame and transmitting the last information bit of the reply frame, and a time CB1between receiving a first information bit of the request frame and a last information bit of the request frame. A correction factorαc=CB⁢⁢1CA⁢⁢2is applied according toC^B⁢⁢2=CB⁢⁢2/αc,and the one-way time isT^t=CA⁢⁢1-C^B⁢⁢22⁢Ti.where Tiis an ideal period of the clocks of the transceivers.

REFERENCES:
patent: 6975655 (2005-12-01), Fischer et al.
patent: 7035285 (2006-04-01), Holloway et al.
patent: 2002/0057717 (2002-05-01), Mallory

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