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Aircraft position monitoring system

  • US 5,381,140 A
  • Filed: 02/18/1993
  • Issued: 01/10/1995
  • Est. Priority Date: 02/18/1992
  • Status: Expired due to Fees
First Claim
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1. An aircraft position monitoring system for monitoring the position of each of a plurality of aircraft in a ground station, the system comprising:

  • first monitor data acquisition means, provided in each aircraft, for automatically and periodically acquiring, from a navigation device mounted in each aircraft, position data and monitor data including aircraft position determination precision data and aircraft identification (ID) data which accompany the position data;

    air/ground communication means for sending the monitor data to the ground station from each aircraft;

    an interface, provided in the ground station, receiving the monitor data sent from each aircraft by the air/ground communication means;

    a track file, provided in the ground station, which stores track data including the position data and the position determination precision data in units of ID data of each aircraft, and stores track data prepared on the basis of flight schedule data for each aircraft in an initial state;

    first tracking processing means provided in the ground station, the first tracking processing means including;

    ID data determination means for retrieving, from the track file, track data which coincides with the ID data included in the monitor data received by the interface;

    data storage means for allowing the contents of the monitor data to be stored as new track data in the track file, when the ID data determination means retrieves no track data which coincides with the ID data;

    deterioration determining means for comparing the position determination precise data included in the monitor data with the previous position determination precise data included in the track data which coincided with ID data, determining whether or not there is deterioration in the position determination precise data included in the monitor data, and discarding the monitor data when there is deterioration in the position determination precise data included in the monitor data;

    position correlation determining means for determining whether or not there is correlation between position data included in the monitor data which have been determined to be free from deterioration and the previous position data included in the track data; and

    track data updating means for adding data contents of the monitor data which correlates to ID track data included in the track file, when the position correlation determining means determines that there is correlation between the position data and the previous position data, and replacing contents of ID track data with contents of the monitor data, when there is no correlation between the position data and the previous position data; and

    display means, provided in the ground station, for displaying the position of each of the aircraft and the ID in a predetermined format on the basis of the monitor data processed by the first tracking processing means.

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