Patent ID: 6308073
Filing Date: 2001-10-23
Classification: H04B,H04W

Abstract:
A wireless tracking system, comprising:a plurality of base stations;a remote station;each of said base stations and said remote station comprising a transmitter, a receiver and digital signal processing circuitry;at least some of said base stations further comprising propagation delay time calculating circuitry capable of determining the propagation delays in signals transmitted between said remote station and said at least some base stations; andeither said remote station or at least one base station further comprising distance calculating circuitry capable of calculating the distance between said remote station to said at least some base stations at different points in time based upon said propagation delay times,wherein either said remote station or said at least some base stations further comprise rate determining circuitry capable of determining the rate of travel of said remote station based upon said locations of said remote station at said different points in time.