Results 161 to 170 of about 71,360 (201)

Radio wave scintillations in the ionosphere

Proceedings of the IEEE, 1982
The phenomenon of scintillation of radio waves propagating through the ionosphere is reviewed in this paper. The emphasis is on propagational aspects, including both theoretical and experimental results. The review opens with a discussion of the motivation for stochastic formulation of the problem.
null Kung Chie Yeh, null Chao-Han Liu
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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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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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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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Ionospheric scintillation observations at Natal

Journal of Geophysical Research: Space Physics, 1981
We report ionospheric scintillation observations made at Natal, Brazil, during a period of 2½ years. The nighttime scintillations of satellite signals at 250 MHz commonly exceeded 20 dB peak‐to‐peak. Seasonally, it showed a typical behavior for the South American sector with a single peak centered around October–November months and the local evening ...
K. C. Yeh, J. P. Mullen, J. R. Medeiros, R. F. da Silva, R. T. Medeiros   +4 more
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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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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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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 Scintillations: Indices and Modeling

Radio Science, 2019
AbstractThis paper presents a review of the ionosphere scintillation characteristics recorded at low and high latitudes. The European Space Agency (ESA) MONITOR database has been used to support the analysis. We review in particular the different indices and the values recorded by the different kinds of receivers deployed during the measurement ...
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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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