Owner Trueposition, Inc.

Inventors Ward, Matthew L.; Anderson, Robert J.; Stilp, Louis A.

Agent A J Park

Pub. Number AU-B-2004230702

PCT Pub. Number WO2004/092762

Priority 10/414,982 15.04.03 US

Filing date 31 March 2004

Wipo publication date 28 October 2004

Acceptance publication date 29 November 2007

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

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

H04Q 7/38 (2006.01)