Mobile telephone location system and method

Abstract

Abstract A portable phone location system and method uses an existing cellular or wireless telephone network to locate the position of any active phone in the network. The system includes a plurality of agile vector sensor units, each one installed at each cell site in the network, and a remote central monitoring station to which cellular phone users can call for assistance in the event of an emergency. The system is designed to locate a portable phone using the reverse voice channel signal transmitted by the phone. Each agile vector sensor unit locks onto the reverse voice channel to determine azimuth and signal strength in the reverse voice channel, and also tracks any changes in voice channel by monitoring the forward voice channel. In the event of a voice channel change, the sensor unit tunes to the new voice channel. The azimuth, signal strength, and reverse voice channel information collected is used to track the location of a portable phone in real time.

Inventors

• 👤 Eliezer A. Sheffer
• 👤 Paul J. Bouchard

Bibliographic Details