David T Jewett

US Patent:

7636061, Dec 22, 2009

Filed:

Jan 28, 2006

Appl. No.:

11/341927

Inventors:

Alan Thomas - Port Angeles WA, US
David Thomas Jewett - Loon Lake WA, US

International Classification:

G01S 1/02
G01S 3/02

US Classification:

342464, 34235706, 342457, 342463

Abstract:

A system and method for determining the position of people and/or objects, whether mobile or stationary, is presented herein. The system uses fixed and/or portable FM transmitters to transmit synchronized signals. These signals are acquired by a Receiver device which uses the signal timing to perform Time Difference of Arrival calculations to determine the Receiver's location. Then, using some arbitrary communications method, such as wireless communications, the Receiver device can forward its location to some arbitrary type of application system.

US Patent:

20050227689, Oct 13, 2005

Filed:

Apr 13, 2004

Appl. No.:

10/823251

Inventors:

David Jewett - Loon Lake WA, US

International Classification:

H04Q007/20

US Classification:

455433000

Abstract:

The present invention is a method and apparatus for automatic calibration of wireless positioning system base stations. An automated system and method for calibrating a location system comprises obtaining at least one position assertion with a corresponding base station-centric position assertion on at least on mobile communication device. A latency calibration record is maintained which includes a current base station latency estimate for a base station controller. The measured position assertion is analyzed in relation to base station-centric position assertion and the latency calibration record, to develop a new base station latency estimate. The latency calibration record is refined using the new base station latency estimate and the steps are repeated to further refine the latency calibration record.