Method of location using signals of unknown origin

Details Method of location using signals of unknown origin Method of location using signals of unknown origin

2006-04-18

2006-04-18

Feild, Joseph (Department: 2681)

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

C455S456500, C455S404200, C342S357490

Reexamination Certificate

active

07031727

ABSTRACT:
The present invention encompasses a method of location comprising: using a plurality of signal receivers to receive one or more multiple frequency input signals, wherein said multiple frequency input signals are of unknown origin, and said signal receivers are of known physical location, finding a difference in time of the reception of the signals between each of the signal receivers, using the difference in time of reception to locate the origin of the signals, utilizing the signals locate a signal receiver of unknown location.

REFERENCES:
patent: 5815814 (1998-09-01), Dennison et al.
patent: 5969679 (1999-10-01), Bolliger et al.
patent: 6249680 (2001-06-01), Wax et al.
patent: 6266534 (2001-07-01), Raith et al.
patent: 6356763 (2002-03-01), Kangas et al.
patent: 6784827 (2004-08-01), Hirt
patent: 6785321 (2004-08-01), Yang et al.
patent: 2003/0052821 (2003-03-01), Holt
patent: 2003/0174086 (2003-09-01), Hirt
patent: 2004/0021566 (2004-02-01), Hayashi et al.

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