Owner Snaptrack Incorporated

Inventors Krasner, Norman F.

Agent Madderns

Pub. Number AU-B-2002312598

PCT Number PCT/US02/20302

PCT Pub. Number WO2004/001993

Filing date 20 June 2002

Wipo publication date 6 January 2004

Acceptance publication date 28 August 2008

G01S 5/14 (2006.01) Position-fixing by co-ordinating two or more direction or position-line determinations - Determining absolute distances from a plurality of spaced points of known location

G01S 1/00 (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

H04B 1/38 (2006.01) Details of transmission systems, not covered by a single one of groups - Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving

H04B 1/40 (2006.01) Details of transmission systems, not covered by a single one of groups - Circuits

H04B 15/02 (2006.01) Suppression or limitation of noise or interference - Reducing interference from electric apparatus by means located at or near the interfering apparatus

H04Q 7/38 (2006.01)

G01S 5/00 (2006.01) Position-fixing by co-ordinating two or more direction or position-line determinations

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