| 摘要 |
An object tracking system (10) comprises an object (12) having a security device (14) mounted thereon, the security device (14) comprising a transmitter (16) and a sensor (22). A mobile beacon unit (26) mounted within a vehicle (28) comprises a receiver (30) and a transmitter (37), which allows the beacon unit (26) to form part of a primary vehicle tracking and recovery network (24). Under normal circumstances, the security device (14) is in a semi-passive state. When an unauthorised or unscheduled act is sensed by the sensor (22), the transmitter (16) begins transmitting an object tracking signal. If the device (14) comes within range of a vehicle (26) forming part of the primary network (24), the vehicle's beacon unit (26) will receive and decode the object tracking signal. The position of the vehicle (28), and therefore that of the object (12), can then be determinated, with recovery forces then being dispatched to the last known location of the object (12). |
