Method for reducing radio ranging errors due to clock frequency offsets
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Dec 9, 2008
Grant Date -
Nov 20, 2008
app pub date -
May 16, 2007
filing date -
May 16, 2007
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A method reduces errors in two-way ranging between transceivers due to a frequency offset. A first transceiver measures a time C.sub.A1 between transmitting a request frame and receiving a reply frame, and a time C.sub.A2 between 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 C.sub.B2 between receiving the request frame and transmitting the last information bit of the reply frame, and a time C.sub.B1 between receiving a first information bit of the request frame and a last information bit of the request frame. A correction factor.alpha..times..times..times..times. ##EQU00001## is applied according to.times..times..times..times..alpha. ##EQU00002## and the one-way time is.times..times..times..times..times. ##EQU00003## where T.sub.i is an ideal period of the clocks of the transceivers.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully