Recent over-the-horizon (0TH) surveillance exercises conducted by the Naval Research Laboratory in cooperation with air and surface units of the U.S. Fleet have permitted the opportunity for detection and characterization of the rotor modulations of the SH-3D helicopter. The uniqueness of the radar signature of the SH-3D rotor blade affords adequate discrimination in an environment of multiple conventional aircraft. Such echoes have been obtained from the SH-3D at line-of-sight ranges and at approximately 870 and 2070 nautical miles from the radar. Though no extensive detection statistic has yet been accumulated, use of a ship's own helicopter for locating the ship's position within the 0TH-sensor envelope has been tentatively demonstrated, as disclosed in this report.


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    Title :

    Utility of Helicopter Rotor Reflections at HF


    Contributors:
    F. H. Utley (author) / W. C. Headrick (author) / D. C. Rohlfs (author) / J. T. Ferrell (author)

    Publication date :

    1972


    Size :

    30 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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