Patent ID: 7502619

Claim:
A system for location determination of wireless devices, over a wide area, comprised of a plurality of wireless devices, a plurality of communication devices, a communication network and a control station coupled to said network, wherein each of said wireless devices comprised of a first short range transmitter and a sensor, but not a receiver, said sensor configured to detect a nearby communication device and consequently trigger said first transmitter to transmit a first signal, said communication device comprised of a second receiver and a third transceiver, said second receiver configured to detect said first signal and couple it to said third transceiver, said third transceiver configured to communicate said signal to said control station through said communication network, said control station configured to determine the location of said communication device, and consequently determine the location of said nearby wireless device, wherein said sensor is configured to detect the nearby communication device by detecting radiation emitted by one of said communication devices communicating with another of said communication devices.