Theoretical and experimental investigations electrodynamical characteristics of RATAN-600.

Calculation of the two- and thee-mirror periscopic systems of RATAN-600 and optimization their characteristics. Measurements and calculation of the antenna noise temperature of the RATAN-600 radio telescope. Calculation of the effective area and the dissipation factors in the antenna system of RATAN-600. Calculation and experimental investigation of the characteristics of the radio telescope RATAN-600 when the primary feed is shifted from the focus. Investigation of the effective area and the noise temperature of RATAN-600 equipped with anti-noise screens. Calculation of the beam pattern and the polarization characteristics of RATAN-600. Experimental investigation of the beam pattern of RATAN-600.

Expansion of the wavelength range of RATAN-600.

A theoretical study of possibility of the RATAN-600 working within millimetre wavelengths range. Experimental investigations of the RATAN-600 characterisics at millimetre wavelengths from observations of the cosmic sources. Investigation of the atmosphere absorption at millimetre wavelengths range. The methodical Sun observations at millimetre wavelength for estimate of antenna surface condition. Theoretical investigations of the characteristics of RATAN-600 within decimeter wavelength range.

Arrays and focal synthesis of images.

Synthesizing of RATAN-600 beam pattern with the help of phased array in the radio telescope focus. Simulation of the work the phased array for eliminate atmosphere for the image restoration of the extended sources. Multielement focal arrays for RATAN-600 radio telescope and paraboloids of revolution. (Russian)

Investigations of new operating modes of RATAN-600.

The RATAN-600 radio telescope in the mode with circular aperture. (the "Zenith" mode). The "quick transpositions" mode. (Russian) The mode of long time tracking of the Sun with "contracted aperture" at the South sector with Flat reflector.  The "radio-Schmidt telescope" mode.

The azimuth synthesis and the image restoration.

Simulation of the map-making wiht help phased array and the image restoration. The Sun map-making in multibeam azimuth synthesis mode at RATAN-600 radio telescope. (Russian)

The Earth's atmosphere.

Measurement of the atmospheric attenuation and the antenna efficiency with help the method of "vertical cuts" of the Earth's atmosphere.

Adjustment of the RATAN-600 radio telescope.

Adjustment with help generator placed in the far-field. Autocollimation adjustment.