The results of operative diagnostics for ionosphere on the base of backscatter sounding received via chirp ionosonde are presented. The results of identification for registered signals and creation of tracks are basic data for determination of maximum usable frequencies and distant-frequency characteristics of one-hop mode 1F2 for oblique propagation on the given grid of ranges, restoration of ionosphere parameters in the direction of sounding. The algorithm for transformation of the received characteristics for oblique sounding to the height-frequency characteristic of vertical sounding with the subsequent restoration of electronic concentration profile is realized.
We present techniques and algorithms for processing and interpretation of backscatter ionosphere sounding ionograms received on chirp ionosonde. The processing of experimental ionograms is carried out on the basis of basic data filtration with the subsequent compression by method of the cellular automaton. The interpretation technique for ionograms is based on use of modeling results for frequency dependences on the minimum group way in the mode of the long-term forecast and results of experimental data processing. We also present the results of operative diagnostics of HF radio channel on the base of current backscatter sounding data.
Under measurement of Doppler shift for signal frequency one define the characteristic average on time or Doppler spectrum. The use of impulses coherent sequence allows to measure Doppler shift of frequency taking into account its small variations caused by non-stationarity of the ionospheric radio channel. In the report we consider the changes of frequency Doppler shift for each beam depending on time under modeling the propagation of impulses coherent sequence through weakly non-stationary ionospheric radio channel.