| 摘要 |
A portable tracking unit attached to a movable object, such as an animal's collar, includes a GPS receiver to receive GPS signals from multiple satellites for use in multilateration calculations in determining the current position of the tracking unit. A processor in the tracking unit processes the GPS data signals to determine the tracking unit's position, and a GSM mobile wireless transmitter is used to transmit the geographic coordinates of the tracking unit to a remote monitoring unit. The tracking unit also includes a motion detector that outputs a motion signal when the animal is on the move. A motion signal“wakes up”the processor that wakes up the GPS receiver and the GSM transmitter to begin calculating and transmitting the geographic coordinates of the tracking unit. The tracking unit also includes electrical generators configured to transduce mechanical motion of the tracking unit into electrical energy to recharge a battery and power devices. The portable tracking unit is fabricated monolithically in silicon with circuitry integrated with silicon micro-machined motion sensor, as well as power generators, and packaged through silicon wafer bonding. A remote computing device receives the geographic coordinates of the tracking device and indicates to a user the position of the tracking device in relation to a map. An alert may also be provided if the location of the tracking device is outside a programmed safe zone.
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