Patent ID: 7301453
Filing Date: 2007-11-27
Classification: G08B

Abstract:
1. A method for locating an individual or article in a three dimensional space, comprising the steps of: (a) providing a transportable beacon carrying a transmitter connected to an antenna, a programmable device, a portable power source and a control input, all carried in or on a supporting structure, wherein said transportable beacon is programmed to transmit a unique coded pulse signal; (b) providing a portable finder including a housing carrying a display, a programmable device, a receiver connected to an antenna, a portable power source, a control input, an audio signal generator connected to an audio transducer, and an accelerometer adapted to sense the motion of the finder, wherein the finder is programmed to receive and decode the unique coded pulse signal of said transportable beacon; c) transmitting a precisely timed pair of code sequences from said transportable beacon, said precisely timed pair of code sequences being modulated to define an inter-pulse ranging interval; (d) determining changes in the inter-pulse ranging interval for locating said individual or article.