Owner Trueposition, Inc.

Inventors Anderson, Robert J.

Agent A J Park

Pub. Number AU-B-2003258179

PCT Number PCT/US03/25168

PCT Pub. Number WO2004/015878

Priority 10/217,782 13.08.02 US

Filing date 11 August 2003

Wipo publication date 25 February 2004

Acceptance publication date 26 July 2007

H04B 1/10 (2006.01) Details of transmission systems, not covered by a single one of groups - Means associated with receiver for limiting or suppressing noise or interference

G01S 5/02 (2006.01) Position-fixing by co-ordinating two or more direction or position-line determinations - using radio waves

G01S 5/06 (2006.01) Position-fixing by co-ordinating two or more direction or position-line determinations - Position of source determined by co-ordinating a plurality of position lines defined by path-difference measurements

H04B 7/26 (2006.01) Radio transmission systems, i.e. using radiation field - at least one of which is mobile

H04Q 7/34 (2006.01)

G01S 1/02 (2006.01) Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters

H04Q 7/38 (2006.01)