Physics
Scientific paper
Jun 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jatp...39..709r&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 39, June 1977, p. 709-721.
Physics
Electron Density Profiles, Ionosondes, Signal Reflection, Spread F, Square Waves, Atmospheric Models, Bandpass Filters, Carrier Frequencies, Earth Ionosphere, Fast Fourier Transformations, Pulse Amplitude, Pulse Duration
Scientific paper
After reviewing some of the main current explanations for the phenomenon of spread-F, the authors perform some calculations to see what happens when a transmitted square pulse is reflected at the peak of a nonmonotonic electron density profile irregularity. The band-pass filtering of the returned frequency spectrum is simulated by pointwise multiplication of the complex frequency spectrum of the returned pulse and the complex frequency response of the receiver. The filtered spectrum is then inverse Fourier transformed. Differentiation is simulated by using a numerical differentiation technique applied to the filtered envelope. The calculations predict the spreading of pulses with reflected carrier frequencies, and show that the spreading occupies a wider range of group heights when the irregularities are higher on the electron density profile than when they are lower, which is in agreement with observed spread-F ionograms.
Dyson Peter L.
Robinson Ivor
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