Key points are not available for this paper at this time.
The digital ionospheric sounding system Digisonde 128PS explores ionospheric structure and dynamics by exploiting all observables of the reflected electromagnetic wave: range, amplitude, phase, Doppler, incidence angle, and wave polarization. The Digisonde operates in two complementary modes of observation: the Ionogram Mode with full range and frequency display but limited resolution in Doppler and incidence angle, and the Doppler‐Drift Mode operating with a limited number of frequency‐range bins but full resolution in Doppler and incidence angle. This technique reduces the volume of magnetically recorded output data to a manageable size. Special digital‐analog hybrid techniques are used for the presentation of the multi‐parameter ionograms and the sky maps.
Bibl et al. (Mon,) studied this question.