Determining the velocity of movement of a large-scale screen by correlation and spectral methods

Details Determining the velocity of movement of a large-scale screen by correlation and spectral methods Determining the velocity of movement of a large-scale screen by correlation and spectral methods

Dec 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975ge%26ae..15.1010i&link_type=abstract

Geomagnetizm i Aeronomiia, vol. 15, Nov.-Dec. 1975, p. 1010-1015. In Russian.

Computer Science

Ionospheric Propagation, Propagation Velocity, Reception Diversity, Signal Fading, Signal Reflection, Coherent Radiation, Cross Correlation, Doppler Effect, Screen Effect, Spectrum Analysis

Scientific paper

The work examines the possibility of using correlation and spectral methods for analyzing the diffraction pattern of a signal reflected from the ionosphere, which is assumed to be a mirror-reflecting surface (screen) with large-scale wave-like structure. Coherent detection and square-law detection are analyzed for a screen with just horizontal or horizontal and vertical velocity components. It is shown that coherent space-diversity reception with small base enables horizontal screen velocities to be determined for screens with sinusoidal curvature and for screens regarded as the superposition of waves. The duration of analyzable recordings for a screen of individual sinusoidal bumps is determined by the fluctuation rate of the signal, which in turn depends on the maximum Doppler frequency shift. For a screen of superposed waves, the length of an analyzable recording depends on the rate of change of the Doppler frequency shifts. The presence of a vertical velocity component makes it impossible to determine the true horizontal velocities.

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