Stolen object location system

Details Stolen object location system Stolen object location system

G - Physics

01

S

343/19

G01S 3/02 (2006.01) G01S 5/04 (2006.01) G01S 5/10 (2006.01) G01S 13/76 (2006.01) G01S 13/78 (2006.01)

Patent

CA 1295717

ABSTRACT OF THE DISCLOSURE A stolen object location system having a base station, a location network and an object unit which is associated with the object to be located. The location system is capable of operating in a plurality of different loca- tion modes ranging from simple triangulation to LORAN. The base station, upon being notified that the object has been stolen, will transmit a locate request message to the object unit specifying the location mode to be used and the transmission frequency of the object unit's transmitter. An electro- nic control in the object unit will control the operation of the object unit's receiver and transmitter in accordance with the location mode and transmission frequency specified in the locate request message. The electro- nic control will also initiate the transmission of an alarm message if the object unit loses communication with the base station, and is capable of transmitting a tattle-tale message, effectively relaying the alarm message of another object unit if the base station does not respond to the other object unit's alarm message.

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