The use is described of measurements made on board civil aircraft to improve tracking accuracy in air traffic control (ATC) systems. The measurements are transmitted to the ground station via the Secondary Surveillance Radar (SSR) mode S data link. First the widely used alpha-beta filter and the first order Kalman filter are reviewed. Next the problem of maneuver handling is described and it is established that significant improvements, in terms of tracking accuracy, are expected when tracking maneuvering aircraft. The shape of maneuvers is examined using recordings made on board civil aircraft during normal scheduled services. The on-board measurements considered are roll angle, heading, and true air speed (TAS). Roll angle and the rate of change of heading are theoretically equivalent, since they are related though aircraft velocity. Maneuver tracking filters using either roll angle or heading are described and compared. It is shown that the filter using heading provides a better performance in the event of missing replies, since changes of heading are eventually detected. Both filters cannot track longitudinally accelerating targets. Next the use of velocity measurements, derived from TAS and heading, is considered. A filter is described that is capable of estimating the wind speed in the vicinity of the aircraft. The same filter provides satisfactory tracking accuracy during maneuvers and can handle longitudinal accelerations. Under monoradar coverage, where the data rate and accuracy are fairly constant, the filters reduce to a particularly simple form, that may be regarded as an enhanced alpha-beta filter. The performance of the filters is evaluated using data recorded during normal scheduled services.


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    Title :

    Use of Downlinked Measurements to Track Civil Aircraft


    Contributors:
    C. C. Lefas (author)

    Publication date :

    1990


    Size :

    21 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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