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We have used direct simulation of occultation signal using a numerical calculation of the parabolic diffraction equation to analyze variations of signal intensity and phase along the line of trajectory of Venus satellite during an occultation experiment. As a result we have proved the linear relationship between variations of frequency and intensity of the signal deformed by regular spherically symmetric ionosphere. It is shown that correspondence between energy and non-energy parameters of a sounding radio wave proves reliability of the result obtained from inversion of the occultation data. 3ms3-PS-36