The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 12, 2008
Filed:
Aug. 09, 2005
John H. Guilford, Stanwood, WA (US);
John H. Guilford, Stanwood, WA (US);
Agilent Technologies, Inc., Santa Clara, CA (US);
Abstract
A time synchronization system synchronizes local clocks of locating units within a communication system using a known external signal. Each of the locating units receives a radio frequency (RF) signal from a transmitter at a known geographical location and measures the RF signal to produce a respective measurement of the signal and a respective timestamp of the measurement recorded at substantially the same time of the local clocks of the locating units. A controller determines a measured time difference of arrival between the locating units using the measurements and timestamps, computes a time synchronization error between the locating units from a difference between the measured time difference of arrival and an expected time difference of arrival and provides a respective time adjustment to each of the locating units to offset the time synchronization error.