| 摘要 |
A stolen property location system which uses a network of transceivers or receivers 2 to receive signals from a transceiver 3 located on stolen property. The transceiver on the stolen property is activated by local or national radio stations or by the transceivers 2 using coded signals. The signal received by the network of transceivers or receivers is sent to a central computer for processing using public telephone systems provided by licensed carriers. The use of the network in conjunction with public telephone systems increases the area of detection of the transceivers located on the stolen property in relation to their signal power output, reducing their relative size, cost and power consumption. The receivers or transceivers 2 may be fixed or mobile, and may be capable of direction-finding or ranging to provide accurate location; alternatively, an approximate location is given by determining which receiver or transceiver 2 receives the signal from transceiver 3. <IMAGE> |
