A 90-GHz (3 mm wavelength) radiometer with a noise output fluctuation of 0.22 degrees K (RMS), with a scanning antenna beam mirror, and the data processing system are described. Real-time radiometric imaging of terrain and man-made objects are shown. Flying at an altitude of 1500 ft a radiometer antenna with a 2 degrees halfpower beamwidth can distinguish landforms, waterways, roads, runways, bridges, ships at sea and their wakes, aircraft on runways, and athletic fields. A flight taken at an altitude of 3000 ft with approximately 2000 ft of clouds below the radiometer demonstrates the ability to distinguish bridges, rivers, marshland and other landforms even though the clouds are optically opaque. The radiometric images of a few representative scenes along with photographs of the corresponding scenes are presented to demonstrate the resolution of the imager system.


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    Title :

    90 GHz Radiometric Imaging


    Contributors:
    H. E. King (author) / J. D. White (author) / J. P. Hollinger (author) / B. E. Troy (author) / J. T. McGoogan (author)

    Publication date :

    1976


    Size :

    60 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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