The method of real-time diagnostics for decameter radio channel on the base ionosphere backscatter sounding data by continuous chirp signal is presented. The method is based on the extraction of the backscatter signal leading edge under processing and interpretation of experimental ionograms. The interpretation of signals on an ionogram is carried out by the results of calculation for minimum group path of the backscatter signal leading edge within waveguide approach using the IRI model. The low variability property of the minimum group path for a signal scattered by the Earth’s surface on a scaled frequencies grid under ionosphere parameters change is used. The results of the extraction of the backscatter signal leading edge on the backscatter ionogram are used to calculate the maximum usable frequencies and group path characteristics for the oblique propagation on the specified radio paths in the sounding sector. The scheme for inversion of the backscatter signal leading edge into parameters of the quasi-parabolic profile of electron concentration is given.
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