| 摘要 |
A communication system is provided which can be realized in a number of ways to facilitate baggage tracking and recovery. In the most rudimentary realization, the traveler receives a signal from transmitters placed in the baggage which can identify the presence of each item of baggage by a code number which may show either as the code number or as a user supplied personal designator for a particular item of luggage. The transmitter is inexpensive and low power but works well in the aircraft environment and causes no interference with aircraft control, communication or navigation equipment. Advanced versions of the invention include programmability and transponder control as well as enhanced audio signaling also include structure which can sense an aircraft environment based upon pressure, vibration and acceleration to provide control to portable electronic devices in response to sensing the take-off, cruise and landing conditions. Especially useful are aircraft takeoff and landing footprints as pre-determined pressure profiles over time. The footprints insure that the proper conditions are met for shutting down equipment, reducing the activity level of the equipment, or turning the equipment back on.
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