Radiolocation in a wireless network using time difference of...

Telecommunications – Radiotelephone system – Zoned or cellular telephone system

Reexamination Certificate

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C455S456600, C455S013200

Reexamination Certificate

active

07840225

ABSTRACT:
A method and an apparatus for radiolocation using time differences of arrival. The method includes receiving transmit timestamps from a set of wireless stations of a wireless network. Each station transmits at least once. The transmit timestamp uses a local timestamping clock to indicate when a station transmitted a packet. The method further includes receiving sets of timestamped captured samples from each station that receives one of the transmitted packets. The times of arrival of each packet at each station are determined from the received sets of timestamped captured samples, and, the relative positions of the stations are determined from the determined times of arrival and the received transmit timestamps. The transmitting by the stations is in a round robin manner one station after the other, and several round robins may be used to mutually calibrate local clocks. Also an apparatus for inclusion in a station of a wireless network. The apparatus includes a buffer subsystem and a timestamping subsystem, such that the station can capture and timestamp a set of samples of a received signal, and send the captured timestamped samples to a processing entity for time difference of arrival location determination.

REFERENCES:
patent: 4486850 (1984-12-01), Hyatt
patent: 5565764 (1996-10-01), Priebe et al.
patent: 5920278 (1999-07-01), Tyler et al.
patent: 7030812 (2006-04-01), Bekritsky et al.
patent: 7184464 (2007-02-01), Abraham et al.
patent: 7190712 (2007-03-01), Abraham et al.
patent: WO 02/058267 (2002-07-01), None
patent: WO 02/058290 (2002-07-01), None
patent: WO 02/058346 (2002-07-01), None
patent: WO 03/100348 (2003-12-01), None
patent: WO 03/107188 (2003-12-01), None
Tim Cornwell and Alan Bridle. “Deconvolution Tutorial.” The National Radio Astronomy Observatory (Charlottesville, Virginia). Nov. 4, 1996. The tutorial is widely distributed, and available online at http://www.cv.nrao.edu/˜abridle/deconvol/deconvol.html.
Eric Weisstein. “CLEAN Algorithm—from Eric Weisstein's World of Physics.” Downloaded on Feb. 14, 2004. Available online at http://scienceworld.wolfram.com/physics/CLEANAlgorithm.html.
“Observing with the MuSiCoS spectropolarimeter: On-line data reduction with ESpRIT.” Laboratoire d'Astrophysique de Toulouse (Toulouse France). Downloaded Apr. 22, 2004 and available online at http://webast.ast.obs-mip.fr/magnetisme/pol/esprit.html.
Jean-Francois Donati. “Least-Squares Deconvolution of Stellar Spectra.” Laboratoire d'Astrophysique de Toulouse (Toulouse France). Downloaded Apr. 22, 2004 and available online at http://webast.ast.obs-mip.fr/people/donati/multi.html.
J.-F. Donati, M. Semel, B.D. Carter, D.E. Rees, and A.C. Cameron. “Spectropolarimetric Observations of Active Stars.” Royal Astronomical society, Monthly Notices, vol. 291, p. 658, Nov. 1997. Available online at http://webast.ast.obs-mip.fr/people/donati/pub/lsd.html.
“AeroScout WLAN Location System.” Downloaded on Nov. 10, 2003 and available online at http://www.bluesoft-inc.com/wlan.asp. Bluesoft, Inc., San Mateo, CA.
“Cognio Announces Breakthrough Location Technology for WLAN Deployments.” Downloaded on Nov. 10, 2003 and available online at http://www.cognio.com/pressdetail.asp?itemID=70. Cognio, Inc., Waltham, MA.
“WhereNet Main Page.” Downloaded Nov. 10, 2003 and available online from http://www.wherenet.com/. WhereNet, Santa Clara, CA.
Office Action to U.S. Patent 7,302,269 mailed Feb. 26, 2007.
Office Action to U.S. Patent 7,302,269 mailed May 17, 2007.

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