Patent ID: 6414673
Filing Date: 2002-07-02
Classification: G01S,G06F

Abstract:
A transmitter location system, comprising:a plurality of receiver locations each having a plurality of external receivers; a time dependent output signal comprising a shaped pulse waveform having consistently identifiable features being transmitted repeatedly from a movable transmitter to each of the plurality of external receivers; means for determining a relative time of arrival for the time dependent output signal to reach each of the plurality of external receivers at each of the receiver locations, the determination comprising a comparison of the consistently identifiable features of the time dependent output signal at each of the external receivers at each of the plurality of receiver locations; means for defining a direction between the movable transmitter and each of the plurality of receiver locations, the defined direction based upon the determined relative time of arrival for the time dependent signal to reach each of the plurality of external receivers at each of the receiver locations; and means for determining location of the movable transmitter, based upon the direction from the movable transmitter to each of the plurality of receivers.