The output of a shipboard-mounted Doppler Current Profiler (DCP) is a profile of water velocity, in various depth bins, relative to the ship. To obtain absolute water velocities, some independent measure of the absolute ship's velocity must be used. The most common measure of ship's velocity is derived from LORAN-C navigation. Unfortunately, LORAN-C derived velocities are not as accurate as Doppler estimates. A process involving a reference layer concept and numerical filtration to obtain estimates of absolute water velocities is described. The cost of using this process is the loss of information concerning the variation of absolute water velocities at periods less than about 1/2 hours. Once the problem of inaccurate navigation is solved, there are still two problems that can affect the quality of absolute water velocity estimates. These problems arise from small errors in the heading ascribed to the ship and to the speed calibration of the Doppler system.


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    Title :

    Estimating absolute current velocities by merging shipboard Doppler current profiler data with LORAN-C data


    Additional title:

    Die Schaetzung der absoluten Stroemungsgeschwindigkeit durch das Mischen der Schiffs-Dopplerprofile mit den LORAN-C Daten


    Contributors:
    Trump, C.L. (author)


    Publication date :

    1986


    Size :

    7 Seiten, 11 Bilder, 2 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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