The theory of the optimal detection of sudden anomalies of VLF-signal phase on ionospheric paths

Details The theory of the optimal detection of sudden anomalies of VLF-signal phase on ionospheric paths The theory of the optimal detection of sudden anomalies of VLF-signal phase on ionospheric paths

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ge%26ae..21..740k&link_type=abstract

Geomagnetizm i Aeronomiia, vol. 21, July-Aug. 1981, p. 740-742. In Russian.

Physics

Communication Theory, Ionospheric Propagation, Lower Ionosphere, Signal Detection, Anomalies, Mean Square Values, Optimization, Phase Deviation, Very Low Frequencies

Scientific paper

It is shown that, during the detection of infrequent exponential pulses on a background of normal noise, the optimal threshold is the level corresponding to a third of the mean-square deviation of the noise. For the example considered, the mean-square deviation of VLF-signal phase in the ionosphere amounts to 5-10 deg when sudden phase anomalies determined by solar effects are observed. Hence, the optimal threshold for the detection of sudden phase anomalies amounts to 2-3 deg.

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