Physics
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jatp...51..389n&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 51, May 1989, p. 389-400. Research supported by Polska Aka
Physics
Incoherent Scattering, Maximum Entropy Method, Traveling Ionospheric Disturbances, Wave Attenuation, White Noise, Line Spectra, Power Spectra, Random Processes
Scientific paper
Two different methods of determining autoregressive coefficients in Maximum Entropy Method (MEM) were compared, investigating power spectra of synthetic signals consisting of three sinusoids and white noise of relatively high level. Spectral line shifts due to the initial phase changes were evaluated. Burg's method was chosen for determining power spectra of experimental signal. Simulating the incoherent scatter data obtained with EISCAT, it was shown that the increasing noise and wave attenuation effects are difficult to separate. Integrating the ME spectral density it was found that, in many cases, it is impossible to reproduce the true power of each harmonic of the signal.
Natorf L.
Schlegel Kristian
Wernik Andrzej W.
Wodnicka Elżbieta B.
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