Personnel locator system

摘要: A personnel locator system for monitoring the locations of classes pernel. Members carry portable, infrared transmitters which transmit pulse trains during discrete burst periods. Transmitters carried by members different different, predetermined frequencies to identify classes, and distinct periods prevent phase synchronization between transmitted transmitters. Infrared receivers are positioned receive in order monitor continued presence personnel. The utilizes having pulses short widths a relatively long time period allow increased battery life while transmitting at high energy levels saturate area reception. less than 40 microseconds 55 millisecond frame.