Owner Groundprobe Pty Ltd

Inventors Noon, David; Reeves, Bryan

Agent Fisher Adams Kelly

Pub. Number AU-B-2006274488

PCT Pub. Number WO2007/012112

Priority 2005903927 25.07.05 AU

Filing date 21 July 2006

Wipo publication date 1 February 2007

Acceptance publication date 19 November 2009

G08B 21/00 (2006.01) Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for

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

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

G01S 5/12 (2006.01) Position-fixing by co-ordinating two or more direction or position-line determinations - by co-ordinating position lines of different shape, e.g. hyperbolic, circular, elliptical or radial

G01S 13/89 (2006.01)

G08B 21/02 (2006.01) Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for

G08B 21/18 (2006.01) Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for