Owner Allen Telecom, Inc.

Inventors Gravely, Thomas, Booker; Carlson, John Peter; Kennedy, Joseph P. Jr.

Agent Peter Maxwell & Associates

Pub. Number AU-B-2003239955

PCT Number PCT/US03/17470

PCT Pub. Number WO2003/102893

Priority 60/384,836 04.06.02 US

Filing date 4 June 2003

Wipo publication date 19 December 2003

Acceptance publication date 2 August 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 1/08 (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 5/06 (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)