Technology developments in the RF tracking and locating of personnel and objects

There are many applications of RF tracking for security, based on the concept of detecting a unique RF transmitter by a receiver covering a given area, where each application has its own unique range of performance requirements. The goal in the WatchMate research program was to develop a base technology that can address many of these requirements while also addressing many of the technical problems associated with each application. Described is a unique microprocessor controlled miniature transmitter that produces programmable coded pulsed transmissions and utilizes antenna diversity techniques, all in a small wrist-watch-sized package that is hermetically sealed with a two year battery life. There are provisions for custom push-button response and a unique tamper-proof means of attachment. The author describes specific monitoring requirements and the associated problems and discusses both receive antenna diversity and phased approaches