초록 ▼

A differential GPS landing system having at least three GPS receivers at known locations in spatial proximity to each other, wherein each GPS receiver independently receives GPS signals from the plurality of GPS satellites and at least three reference stations, wherein each reference station receive

A differential GPS landing system having at least three GPS receivers at known locations in spatial proximity to each other, wherein each GPS receiver independently receives GPS signals from the plurality of GPS satellites and at least three reference stations, wherein each reference station receives a signal from a different two of the at least three GPS receivers and calculates two separate differential corrections for each satellite, wherein each differential correction is independently calculated using the signals received from a different one of the two GPS receivers. The reference stations preferably average the two calculated differential corrections for each satellite to produce an averaged differential correction for each satellite. The system then validates the averaged differential correction for each satellite calculated by each reference station using two integrity monitors, wherein each integrity monitor receives the averaged differential corrections from a different two of the at least three reference stations, and each integrity monitor compares, with respect to each GPS satellite, the averaged differential corrections from the two of the at least three reference stations to produce a validated set of differential corrections, and broadcasts the averaged differential correction for each satellite calculated by one of the three reference stations. The preferred differential GPS landing system further includes a method that utilizes current differential correction error statistics, prior differential correction error statistics and a Bayesian interval estimation bounding process to provide an error bound on the broadcast differential corrections.

대표청구항 ▼

[ We claim:] [1.] 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)

[ We claim:] [1.] 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.