Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Date of Patent
February 5, 2008
Patent Application Number
10970642
Date Filed
October 20, 2004
Patent Primary Examiner
Patent abstract
A method estimates a distance between transceivers in a wireless communications network. A first time interval T is set in a transmitter and a receiver. A signal is transmitted from the transmitter to the receiver at a time t2 according to a first clock of the transmitter. The signal is received in the receiver at a time t3. Processing delays of the receivers are determined. A reply to the signal is sent from the receiver to the transmitter at a time t6 such that |t3−t6|=T. The reply is received in the transmitter at a time t7 of the first clock and a distance d between the transmitter and the receiver is determined according to d=c(|t2−t7|−T)/2, where c is the speed of light.
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