Methodical maintenance of radiometric measurements of atmosphere at millimeter waves range

The methodology of determination of radio-brightness temperature values (Tb) of atmosphere and total vertical absorption of atmosphere by the method of radiometry are described. A qualitative analysis of sources of errors in the considered calibration methods, methods of restoration of intensity of radio-heat radiation and vertical absorption in the atmosphere is carried out. Results of estimates of accuracy of restoration of Tb of the atmosphere are given for the case of use of different combinations of calibration methods of the radiometer and methods of measurement of diffraction coefficients of radiometer's antennas. The possibility of determination of radio brightness of the sky with 3% accuracy at 3 millimeter waves range is shown.