A method of extending geodetic control to geographical areas in which control is sparse or nonexistent makes use of unique combination of aerotriangulation and distance measuring technology. Aircraft or drones are flown over a designated area under control of a radial electronic navigation system. A second higher flying aircraft containing an accurately calibrated metric camera is controlled over the same area and aerial photographs are taken in sequence. Imagery includes both lower flying aircraft and area in which control is desired. Both camera, imagery and photographed aircraft are in a common highly accurate coordinate system. A detailed error analysis was conducted using four aircraft and four ground beacons. The ground beacons are geodetic anchors for the distance measuring equipment navigation system (DME). Ground surveys of existing DME navigation range at RADC were used. Equipment errors from actual equipment were used. Standard corrections for environmental effects were made. The concept was as good as the standard ground techniques for ground control extension. The moving target technique is flexible and aircraft can be commanded to take advantage of lines of flight providing the superior geometry and smallest errors in X, Y and Z coordinates. The use of aerotriangulation and DME navigation represents an order of magnitude decrease in the time required to perform conventional surveys to DME navigation system requirements. (Author)


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    Title :

    Extension of Ground Control with Moving Airborne Targets


    Contributors:
    D. I. Zulch (author) / R. H. Brock (author)

    Publication date :

    1979


    Size :

    58 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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