Results 181 to 190 of about 2,215 (219)

Quasiperiodic scintillation in the ionosphere

Journal of Atmospheric and Terrestrial Physics, 1972
Abstract The hypothesis is advanced that a regular cyclic type of fading seen occasionally on chart recordings of HF and VHF radio frequency signals that have penetrated the ionosphere is a special case of the more normal irregular ionospheric scintillation.
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Spectra of ionospheric scintillation

Journal of Geophysical Research, 1976
Observations of amplitude and phase scintillation were made at the Millstone Hill radar facility by using phase coherent sources at 150 and 400 MHz on the U.S. Navy navigation system satellites. These observations have been processed to yield power spectra of the fluctuations in the logarithm of the received power (log power) at each frequency and the ...
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High latitude ionospheric scintillations

Canadian Journal of Physics, 1984
The statistical characteristics of ionospheric irregularities are often described by specifying one or two of the statistical parameters of the scintillations that the irregularities produce in satellite radio signals. The most commonly used parameter for this purpose is the spectral index (slope of the power spectral density function on a log–log ...
J. A. Fulford, P. A. Forsyth
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Scintillations and the Latitude Distribution of Ionospheric Irregularities

Nature, 1961
KENT1 has reported a series of observations on the 40 Mc./s. transmissions from Sputnik 1 made at Cambridge during October 1957. He found that the transmissions always underwent rapid fading (scintillation) when the satellite was north of Cambridge but only occasionally when south of Cambridge.
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Multifrequency studies of ionospheric scintillations

Radio Science, 1977
Simultaneous scintillation data from the ATS‐6 Radio Beacon Experiments for signals at 40, 140, and 360 MHz offer the opportunity to study the frequency dependence of the scintillation phenomenon. Using these data variations of the spectral index, correlation coefficient, and the correlation interval are investigated.
R. Umeki, C. H. Liu, K. C. Yeh
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Algorithm of Ionospheric Scintillation Monitoring

2018 7th International Conference on Digital Home (ICDH), 2018
With the development of the Beidou satellite navigation system, the monitoring of ionospheric scintillation combined with GPS and Beidou system has become a trend. In this paper, the design and implementation of the upper computer software for ionospheric scintillation monitoring are introduced, and the related algorithms such as ionospheric amplitude ...
Xiyan Sun, Zheyang Zhang, Yuanfa Ji, Suqing Yan, Wentao Fu, Qidong Chen   +5 more
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Power spectra of ionospheric scintillations

Journal of Atmospheric and Terrestrial Physics, 1974
Abstract The diffraction theory of interplanetary scintillations, which allows a connection to be established between the spatial spectrum of electron-density fluctuations in the irregular medium and the power spectrum of intensity scintillations observed on the ground, is reviewed and applied to the case of the ionosphere.
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Superposition Property of the Ionospheric Scintillation S4 Index

IEEE Geoscience and Remote Sensing Letters, 2020
S4 index is the rapid modification of signals when propagating through small-scale structures in the ionosphere, called ionospheric irregularities. The rapid modification of the signal causes the scintillation of the power. The purpose of this letter is to confirm the superposition property of the S4 index by using the ray-tracing method to simulate ...
Wen-Hao Yeh, Chi-Yen Lin, Jann-Yenq Liu, Shih-Ping Chen, Tung-Yuan Hsiao, Cheng-Yung Huang   +5 more
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Ionospheric irregularities and radio scintillations

Contemporary Physics, 1975
(1975). Ionospheric irregularities and radio scintillations. Contemporary Physics: Vol. 16, No. 5, pp. 469-488.
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Scintillation Simulator Test Results: Hardware-in-the-Loop Emulation of Ionospheric Scintillation

2014 IEEE Military Communications Conference, 2014
Ionospheric scintillation induces distortion onto RF communication and radar signals that propagate through the ionospheric medium. Unless properly accounted for, this scintillation may greatly impact the performance of military and commercial satellite signals.
William S. Sward, Taylor Swanson, McKay Williams   +2 more
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