Abstract: A system records the movement of people carrying mobile devices within a specific area. A plurality of receivers distributed throughout the specified area monitor the area for wireless communication from a mobile device. Mobile devices are identified by way of a unique identifier, e.g. IMSI, IMEI, MAC address, or similar transmitted on a control channel or the like. Whenever such wireless communication is detected, the direction from which the signal is received is detected. The position of the mobile device (and hence the person carrying it) may be calculated by triangulating results from two or more receiving devices, and the results stored.

Abstract: A system records the movement of people carrying mobile devices within a specific area. A plurality of receivers distributed throughout the specified area monitor the area for wireless communication from a mobile device. Mobile devices are identified by way of a unique identifier, e.g. IMSI, IMEI, MAC address, or similar transmitted on a control channel or the like. Whenever such wireless communication is detected, the direction from which the signal is received is detected. The position of the mobile device (and hence the person carrying it) may be calculated by triangulating results from two or more receiving devices, and the results stored.