System for determining position of an emitter

Details System for determining position of an emitter System for determining position of an emitter

2005-03-01

2005-03-01

Issing, Gregory C. (Department: 3662)

Communications: directive radio wave systems and devices (e.g.,

Directive

Beacon or receiver

C342S463000, C342S465000

Reexamination Certificate

active

06861982

ABSTRACT:
The position of a non-cooperating emitter is determined by detecting a signal from the emitter at three or more receiver communication devices positioned at different locations. The receiver communication devices determine respective detection times of the emitted signal in respective local time reference frames. To establish a common time reference frame for the emitted signal detections, each receiver communication device exchanges time synchronization signals with a reference communication device. Since any of the receiver communication devices and the reference communication device may be mobile, the signal exchange allows each receiver communication device to accurately determine the signal propagation time between itself and the reference communication device and factor the signal propagation time into an accurate adjustment of the local time reference frame. Using trilateration, the position of the emitter is determined from known positions of the receiver communication devices and the emitted signal detection times from the receiver communication devices.

REFERENCES:
patent: 3848254 (1974-11-01), Drebinger et al.
patent: 3886553 (1975-05-01), Bates
patent: 4665404 (1987-05-01), Christy et al.
patent: 5109390 (1992-04-01), Gilhousen et al.
patent: RE34004 (1992-07-01), Rogoff et al.
patent: 5293642 (1994-03-01), Lo
patent: 5317323 (1994-05-01), Kennedy et al.
patent: 5469409 (1995-11-01), Anderson et al.
patent: 5579321 (1996-11-01), Van Grinsven et al.
patent: 5663990 (1997-09-01), Bolgiano et al.
patent: 5774876 (1998-06-01), Wooley et al.
patent: 5912644 (1999-06-01), Wang
patent: 5982324 (1999-11-01), Watters et al.
patent: 6040800 (2000-03-01), Raith et al.
patent: 6166691 (2000-12-01), Lindqvist
patent: 6310576 (2001-10-01), Johnson
patent: 6518921 (2003-02-01), Irvin et al.
patent: 20010030625 (2001-10-01), Doles et al.
patent: 0 964 265 (1999-12-01), None
patent: 1073216 (2001-01-01), None
patent: 1 289 172 (2003-03-01), None
patent: 2 316 823 (1998-03-01), None
patent: 2353671 (2001-02-01), None
patent: WO0110154 (2001-02-01), None
patent: WO0115340 (2001-03-01), None
Robert A Scholtz, “The Origins of Spread-Spectrum Communications”, IEEE Transactions on Communications, vol. COM-30, No 5, 1982.
Benjamin B. Peterson, et al., “Spread Spectrum Indoor Geolocation”, vol. 45, No. 2, pp. 97-102, 1998.
U.S. Appl. No. 09/365,702, “Method and Apparatus for Determining the Position of a Mobile Communication Device Using Low Accuracy Clocks” Dennis McCrady, et al., filed Aug. 2, 1999.
U.S. Appl. No. 09/777,625, “Method and Apparatus for Determining the Position of a Mobile Communication Device”, Dennis McCrady, et al. , filed Feb. 6, 2001.
Dennis D. McCrady, “Mobile Ranging Using Low-Accuracy Clocks”, IEEE Transactions on Microwave Theory and Techniques, VOL. 48, No. 6, Jun. 2000, pp. 951-957.

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