Patent ID: 6067484
Filing Date: 2000-05-23
Classification: G01S,G05D

Abstract:
A differential GPS landing system for broadcasting a set of differential corrections relating to a plurality of GPS satellites, wherein each GPS satellite broadcasts GPS signals comprising information sufficient to calculate a pseudorange to the satellite, the system comprising:(i) at least three GPS receivers at known locations in spatial proximity to each other, each of the GPS receivers comprising means for independently receiving the GPS signals from the plurality of GPS satellites and producing a receiver output signal comprising a set of pseudoranges for the GPS satellites to the particular receiver;(ii) at least three reference stations, each reference station comprising:means for receiving the receiver output signal from a different two of the at least three GPS receivers;means for calculating two separate differential corrections for each satellite, each of the differential corrections being independently calculated using the output signals received from a different one of the two GPS receivers; andmeans for averaging the two calculated differential corrections for each satellite to produce an averaged differential correction for each satellite; and(iii) means for validating the averaged differential correction for each satellite calculated by each reference station and for broadcasting the averaged differential correction for each satellite calculated by one of the three reference stations.