Patent ID: 8351961

Claim:
A system for locating a mobile communication device in a region of interest, comprising: a plurality of radio frequency (RF) receiver devices at respective locations within the region, wherein: in a first operating mode, the receiver devices are configured to scan a frequency band to search for a signal of interest associated with a communication device emitting the signal of interest within the region, at least some of the receiver devices being configured to switch to a second operating mode in response to at least one of the receiver devices detecting the signal of interest at a frequency within the frequency band; and in the second operating mode, the at least some of the receiver devices are configured to tune to the frequency of the signal of interest detected in the first operating mode to measure signal levels at the respective locations within the region; and a processor in communication with the receiver devices and configured to: determine a location of the communication device from the signal levels measured by the at least some of the receiver devices in the second operating mode; and notify said determining of location of the communication device emitting the signal of interest within the region.