UV_SHORT Step_2
Keywords: imager

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UV_SHORT Step_2

              Step (2) Extraction of UV visibilities from this map.

        From  the given input data cube, or the "well behaved" data cube created
        by Step (1), UV_SHORT  computes the visibilities in the following way:

          - Fourier transform of the single dish map;
          - Division by  the Fourier  transform of  the single dish  beam, up  to a
            maximum spacing (SHORT_SD_DIAM, in meters);
          - Inverse Fourier transform to the image plane and then for each pointing
            center;
          - Multiplication of the  image by the primary beam  of the interferometer
            elements;
          - Fourier transform back to the UV plane;
          - Creation  of the  visibilities,  with  a given  weight  SHORT_SD_WEIGHT
            and an appropriate calibration factor to Janskys SHORT_SD_FACTOR.

        Both the  single-dish and the  interferometer antennas are  assumed   to
        have gaussian beams (SHORT_SD_BEAM and SHORT_IP_BEAM, in radians).