High-accuracy spacecraft tracking requires tropospheric modeling which is generally scaled by either estimated or measured values of surface refractivity. This report summarizes the results of a worldwide surface-refractivity test conducted in 1968 in support of the Apollo program. The results are directly applicable to all NASA radio-tracking systems. (Author)


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    Title :

    Surface Refractivity Measurements at NASA Spacecraft Tracking Sites


    Contributors:

    Publication date :

    1972


    Size :

    49 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English