Patent ID: 6081229
Filing Date: 2000-06-27
Classification: G01S,G04G,H04W

Abstract:
A system for determining a position of a mobile wireless transceiver comprising:a base station;means for calculating a Doppler shift of signals transmitted from first, second and third satellites, respectively, relative to the base station;means for calculating a first set of pseudo ranges of the first and second satellites, respectively, relative to said base station;means for sending satellite identification information, Doppler shift information, and said pseudo range information between said base station and said wireless transceiver;means disposed at said wireless transceiver for receiving said satellite identification information, Doppler shift information, and said pseudo range information from said base station;means disposed at said mobile wireless transceiver for utilizing said information received from said base station to identify a second set of pseudo ranges between said transceiver and said first and second satellites, respectively, at a time T;means disposed at said mobile wireless transceiver for sending to said base station said second set of pseudo ranges between said transceiver and said first and second satellites, respectively, along with time information for the time T; andmeans disposed at the base station for calculating the position of said wireless transceiver in response to said second set of pseudo ranges and said time information for the time T.