Computation of the polarization characteristics of RATAN-600 in the "Southern sector with a flat reflector" mode with the diffraction effects considered

Details Computation of the polarization characteristics of RATAN-600 in the "Southern sector with a flat reflector" mode with the diffraction effects considered Computation of the polarization characteristics of RATAN-600 in the "Southern sector with a flat reflector" mode with the diffraction effects considered

Apr 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011astbu..66..215m&link_type=abstract

Astrophysical Bulletin, Volume 66, Issue 2, pp.215-232

Astronomy and Astrophysics

Astronomy

2

Techniques, Radar Astronomy

Scientific paper

We report the Mueller matrix elements for RATAN-600 computed with the allowance for the diffraction effects in the space between the main, secondary, and flat mirrors in the Souther sector with a flat reflector ("South+flat") observing mode and in the mode of single-sector observations at the horizon throughout the entire operating wavelength range. We show that the vertical size of the M 41 and M 32 elements decreases, the elements shift relative to the central horizontal section, and the lobe structure of the elements changes with increasing wavelength. In the "South+flat' mode these changes, which are due to diffraction effects, begin to show up at shorter wavelength compared to the single-sector mode. We investigated the variation of the structure of the elements M 41 and M 32 with the elevation angle of the flat reflector and in the case of longitudinal and transversal off-focus offsets of the primary feed.

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