Patent ID: 7768398

Claim:
A security system for a group of cargo items carried on a mobile platform, comprising: a detection device carried on each item for detecting an intrusion into the item; a wireless transmitter carried on each of the items and coupled with the corresponding detection device; at least one base receiver station on the platform for receiving signals from the wireless transmitters carried on the items; a communication system on-board the platform, the communication system being communicatively coupled with the base receiver station and operable for transmitting information relating to the detected intrusion to a location off-board the platform; a plurality of the wireless transmitters respectively carried on the items, each of the transmitters being coupled with a corresponding detection device responsive to a detected intrusion, said wireless transmitter for transmitting a signal indicating detection of the intrusion; and a plurality of the base receiver stations located in spaced apart relationship on the platform, wherein each of the base receiver stations receives signals from the wireless transmitters in closest proximity to a respective base receiver station, each of said items further comprising a wireless receiver coupled with the wireless transmitter to provide duplex communication with said respective base receiver station, said duplex communication comprising signals originating with said respective base receiver station.