Patent ID: 6292106
Filing Date: 2001-09-18
Classification: G01S,G08B

Abstract:
A system for locating and tracking personnel in rooms of a building, comprising:means for transmitting a radio frequency (RF) sync pulse throughout a building having a plurality of rooms to be traversed by a plurality of players;means for transmitting ultra-sound pulses from a plurality of fixed locations in each room, the ultra-sound pulses being generated in a predetermined timed sequence after each RF sync pulse;means on each player for receiving the RF sync pulses and generating signals representative of the time each RF pulse is received;means on each player for receiving the ultra-sound pulses transmitted in a room in which the player is currently located and generating signals representative of the delays between each RF sync pulse and the receipt of each of the ultra-sound pulses sequentially received thereafter;means on each player for transmitting an RF tracking signal representing an identity of the player and the delays that each ultra-sound pulse is received after each RF sync pulse; andcontrol facility means for receiving the RF tracking signals from the players and for determining each player's current position within one of the rooms based upon the delays that each ultra-sound pulse is received after each RF sync pulse for each player and for displaying the identity and current location of each player as each player moves within the rooms and moves from room to room.