Very long baseline interferometry (VLBI) is one of the modern geodetic techniques that allows to construct Terrestrial and Celestial Reference Frames
and to determine Earth Orientation Parameters. Now, there are seven analysis centers in the world which are perform processing of geodetic VLBI observations
on regular basis. These centers use one of three available VLBI data analysis software: CALC/SOLVE, OCCAM and SteelBreeze. In the presentation one of these
software, SteelBreeze, is described. The procedures and algorithms of construction of Celestial and Terrestrial Reference Frames, Earth Orientation Parameters
are discussed. Obtained from VLBI data analysis series of nutation angles is used for investigation of the excitation of the free core nutation by the atmosphere
and ocean.
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