A refractive index model for use on board ships has been evaluated during 1987 and 1988. Using the model, the radar range conditions can be calculated from measurements of sea surface temperature, air temperature, air humidity, and wind velocity. The model gave good results in 80% of the cases in 1987, and in 65% of the cases in 1988. The reason for the decreased results in 1988 were due to wrong values of air humidity (dew point). When the measurement equipment operated properly, the model gave good results in 75% of the cases as a mean for 1987 and 1988. Frequent inspections are needed for the humidity equipment. One more reason for wrong model results has been horizontal variations of duct conditions. The results from testing the model are so good that the method is proposed for the ships in the Swedish Navy.


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    Title :

    Utvaerdering av Lokal Brytningsindexmodell pa Fartyg Foersoek Genomfoerda 1987 och 1988 (Evaluation of a Refractive Index Model on Board a Ship)


    Contributors:
    E. Karlsson (author) / A. C. Nilsson (author) / M. Nordstrand (author) / H. Renstroem (author) / P. Caspersson (author)

    Publication date :

    1989


    Size :

    24 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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