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Wednesday, April 22, 2020 | History

3 edition of Frequency correlation of atmospheric scintillation found in the catalog.

Frequency correlation of atmospheric scintillation

Frequency correlation of atmospheric scintillation

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  • 10 Currently reading

Published by U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, Wave Propagation Laboratory, For sale by the National Technical Information Service in Boulder, Colo, Springfield, VA .
Written in English

    Subjects:
  • Scintillators.,
  • Atmospheric turbulence.

  • Edition Notes

    StatementJames H. Churnside, Richard J. Lataitis, James J. Wilson.
    SeriesNOAA technical memorandum ERL WPL -- 202.
    ContributionsLataitis, R. J., Wilson, James J., Wave Propagation Laboratory.
    The Physical Object
    FormatMicroform
    Paginationiii, 16 p.
    Number of Pages16
    ID Numbers
    Open LibraryOL17678903M


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Frequency correlation of atmospheric scintillation Download PDF EPUB FB2

COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle.

Frequency correlation of atmospheric scintillation - NASA/ADS The authors present the results of measurements of the correlation of scintillations of two colors of light made in the turbulent atmosphere.

In strong path-integrated turbulence, the correlation is below that predicted by the weak-turbulence : James H. Churnside, Richard J. Lataitis, James J. Wilson. Scintillation is caused by small-scale (tens of meters to tens of km) structure in the ionospheric electron density along the signal path and is the result of interference of refracted and/or diffracted (scattered) waves.

Scintillation is usually quantified by two indexes: S4 for amplitude scintillation and σφ (sigma-phi). Electromagnetic Scintillation II. Weak Scattering Albert D. Wheelon Environmental Technology Laboratory National Oceanic and Atmospheric Administration.

Amplitude scintillation occurring in the troposphere increases with signal frequency and depends on a number of other link and meteorological parameters. In the design and link-budget calculations of low-margin VSATs and USATs communications systems scintillation effects need to be considered.

Its first version was used to study atmospheric scintillation on timescales between milli- and nsec, utilizing some 25 full nights at a telescope on La Palma (Canary Islands).

Source intensity modulations of incoherent background appear as modulations in the detector outputs and this can arise from atmospheric scintillation [27]. The atmospheric scintillation frequency spectrum extends to around 1kHz so the modulation frequency is placed beyond this level to reduce background noise.

In meantime we can not measure the magnitude of scintillation with elevation angle 5˚˚. A prediction method is suggested to measure tropospheric scintillation on earth-space path. It would apply this method to standard atmosphere and we studied the effect of meteorological.

Data from the ionospheric scintillation monitor and ionosonde at the low‐latitude station Vanimo (°S, °E; dip latitude 11°S) in the Southern Hemisphere Frequency correlation of atmospheric scintillation book were statistically analyzed to study the correlation between Cited by: 8.

Rocca, F. Roddier, J. VerninDetection of atmospheric turbulent layers by spatiotemporal and spatioangular correlation measurements of stellar-light scintillation[J] J. Opt. Soc. Am., 64 (7) (), pp. Author: Su Wu, Su Wu, Xiaodan Hu, Xiaodan Hu, Yajuan Han, Yajuan Han, Xiaoqing Wu, Changdong Su, Changdong S.

Scintillation Ionospheric Scintillation Tropospheric Scintillation Procedure Low Elevation Angle Effects Atmospheric Hultipath Spreading Loss Procedure Rado_Attenuation Dry Conditions Wet Conditions Diversity Schemes Earth Terminal Site-Diversity Satellite. Books.

Publishing Support. Login. Reset your password. If you have a user account, you will need to reset your password the next time you login. You will only need to do this once. Find out more. IOPscience login / Sign Up. Please note:Cited by: 1.

EFFECTS OF ATMOSPHERIC SCINTILLATION IN KA-BAND SATELLITE COMMUNICATIONS A Dissertation presented to The Faculty of the Division of Graduate Studies by Scott A. Borgsmiller In partial fulfillment of the requirements for the degree of Doctor of Philosophy in Electrical Engineering Georgia Institute of Technology February from the long-term frequency scaling factors, which are intended to scale the statistics of a propagation effect.

In this paper the attention is focused on the analysis of the short-term frequency scaling factor of clear-sky and wet amplitude scintillation, using the measurements of the /20/30GHz beacon signals of the OlympusCited by: Measurements of the transverse scale of F-layer irregularities, based on radio-star observations from College, Alaska, at frequencies of 68 and MHz, are reported.

Analysis by the two-frequency scintillation-ratio technique yields typical Cited by: 8. () JOURNAL ARTICLES. Wang, Ting-I, R. Lataitis, and G. Ochs (): Laser weather identifier: Present and future, J. Appl. Meteorol., 21, The Global Ionospheric Scintillation Model (GISM) () The scintillations spectrum usually exhibits a linear variation with the logarithm of frequency.

The The cut-off frequency is related to the correlation distance of inhomogeneities. The value of p depends on the specific conditions of development of the turbulences, in particular File Size: KB. Each observation \run" consisted of a discrete sweep of the laser modulation frequency around the predicted Larmor frequency.

In order to reduce atmospheric scintillation noise, the rate of the laser pulsing (f pulse) was continuously dithered with a square-wave function such that f pulse(t) = f step + fsgn[cos(2ˇf mt)], where fCited by: This paper presents a new statistical model of optical intensity fluctuation (scintillation), considering time correlation of atmospheric propagated optical signal in RoFSO (radio on free space optics) channel.

Relationships among frequency characteristic of RoFSO channel, variance of optical intensity, and atmospheric temperature are examined. Wave propagation in random media (scintillation) adaptive optics Alfven waves amplitude aperture approximation Astrophys asymptotic average backscattering Basu beam computed correlation function diffraction distance distribution double passage effects electron density equation equatorial Figure Fourier frequency About Google Books.

Phasescintillation is more dependent on large turbulent eddies, while smaller disturbances canresult in amplitude scintillation.

Also, amplitude scintillation is most intense when theFresnel frequency is at or below the resolution of the measurement, but in this situation,phase scintillation is usually not detected. The tropospheric scintillation due to irregularities of the refractive index in the troposphere is investigated using 14/GHz low-elevation measurements made during at Yamaguchi, Japan.

The diurnal and seasonal variations, frequency dependence derived from a comparison of the and GHz signals, and elevation-angle dependence of the Cited by: atmospheric scintillation The Earth's turbulent atmosphere causes stars to "twinkle", i.e.

to undergo rapid fluctuations in their intensity. Already simple optical effects lead to image distortions (seeing), while only [differential] effects of higher order also cause the intensity to be modulated (scintillation).

the “scintillation intensity.” On a long-term basis, correlation between the scintillation variance/intensity and meteorological parameters is generally observed. In the prediction models presented by Karasawa, Yamada, and Allnutt [10] and ITU-R [11], the long-term scintillation variance is expressed as related to, which is a function.

Link Budget April 10 They are detected as variations in amplitude, phase, polarization and angle of arrival of the radio waves. It is often recommended the introduction of a fade margin so atmospheric scintillation can be a tolerated phenomenon. Figure – Ionospheric scintillation.

The relationship between day-to-day variability of equatorial plasma bubbles (EPBs) and the neutral atmosphere is studied. This study is based on the previous study in which the GPS scintillation index and the tropospheric cloud-top temperature are used as proxies for EPB activity and atmospheric perturbations, respectively, and a correlation was found between.

Two-color correlation of atmospheric scintillation. Churnside JH, Lataitis RJ, Wilson JJ. We present the results of measurements of the correlation of scintillations of two colors of light made in the turbulent atmosphere.

In strong path-integrated turbulence the correlation is below that predicted by the weak-turbulence by: 8. ionospheric scintillation can be investigated by correlation of scintillations with other observations of space weather activity, particularly precipitation of high energy electrons in the upper polar atmosphere which manifests as Aurora and concurrent increases in absorption of HF Radio signals in the lower D-layer of the ionosphere.

Electromagnetic scintillation describes the phase and amplitude fluctuations imposed on signals that travel through the atmosphere. Providing a modern reference and comprehensive tutorial for this subject, two volumes cover optical and microwave propagation, integrating measurements and predictions at each step of development.

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, VOL. 47, NO. 1, JANUARY 77Frequency Dependence of Amplitude Scintillation Max M. van de Kamp, Carlo Riva, Jouni K. Tervonen, and Erkki T. Salonen Abstract—In the prediction models of tropospheric scintillation 15), scintillation may contribute as much as rain or even moreon earth-satellite.

proaches to the evaluation of scintillation effect are com-pared. The simulations are performed for a horizontal-path propagation of the Gaussian-beam wave. Keywords FSO, atmospheric turbulence, scintillation, Gaussian beam, Rytov variance. Introduction A number of phenomena in the atmosphere such as scattering, absorption and turbulence File Size: KB.

Look up scintillation in Wiktionary, the free dictionary. Scintillation can refer to: Scintillation (astronomy), atmospheric effects which influence astronomical observations.

Interplanetary scintillation, fluctuations of radio waves caused by the solar wind. Scintillation (physics), a flash of light produced in certain materials when they. We present a comparative study of computational methods for estimation of ionospheric scintillation indices. First, we review the conventional approaches based on Fourier transformation and low-pass/high-pass frequency filtration.

Next, we introduce a novel method based on nonparametric local regression with bias Corrected Akaike Information Criteria (AICC).Cited by: 4. Scintillation effects are always much more pronounced near the horizon than near the zenith (directly overhead), since light rays near the horizon must penetrate a denser layer of and have longer paths through the atmosphere before reaching the observer.

Atmospheric twinkling is measured quantitatively using a scintillometer. Second order statistical moments of new internal MHD wave in the ionospheric F region are investigated analytically by geometrical optics approximation.

Degree of a curvature of a constant phase surface and the variance of an instant frequency measuring by experiment has been obtained for arbitrary correlation function of electron density : Jandieri George, Rahul Kaushik, Tugushi Nika.

The locally stationary temperature spectrum in the atmospheric surface layer is estimated using laser scintillation. The fluctuations of the parameters of the turbulence spectrum (the structure constant C T 2 and inner scale l 0) have a lognormal average spectrum is calculated by averaging the locally stationary spectrum over these by: The refractive index of a turbulent atmosphere can be expressed as, where the average refractive index is approximately equal to 1 and the small fluctuations are represented by.

Scintillation is the process of distortion that an optical beam experiences while propagating through a random medium, such as a turbulent atmosphere. The first volume of this set of books on electromagnetic scintillation dealt with phase and angle-of-arrival measurement errors, which are accurately described by geometrical optics.

Spherical Waves on Horizontal Paths Plane Waves and Collimated Beams The Effect of Atmospheric Beam Waves   Abstract [1] The phase scintillation index (σ ϕ), equal to the standard deviation of measured phase, is often used to characterize Global Positioning System (GPS) observations in ionospheric environments that may be σ ϕ is dominated by large-scale fluctuations, questions of usage and interpretation exist as will be illustrated here.

Tropospheric scintillation is a phenomenon that will cause signal degradation in satellite communication with low fade margin. Few studies of scintillation have been conducted in tropical regions.

To analyze tropospheric scintillation, we obtain data from a satellite link installed at Bandung, Indonesia, at an elevation angle of ° and a frequency of Cited by: 5.

Electromagnetic Scintillation describes the phase and amplitude fluctuations imposed on signals that travel through the atmosphere. These volumes provide a modern reference and comprehensive tutorial for this subject, treating both optical and microwave propagation. Measurements and predictions are integrated at each step of the development.1 Scintillation Reduction for Laser Beams Propagating Through Turbulent Atmosphere G.P.

Berman1, V.N. Gorshkov1, 2, 3, S.V. Torous2 1Theoretical Division, T-4 & CNLS MS B, Los Alamos National Laboratory, Los Alamos, New Mexico 2National Technical University of Ukraine “KPI,” 37 Peremogy Avenue, Building 7, Kiev- 56, Ukraine 3The Institute of .Scintillation Theory.

Different theories are used to interpret ionospheric scintillation data. Since the scintillation phenomenon is being studied by direct measurements from a number of satellites using multi-frequency phase coherent beacon signals, we will focus on the full structure of the complex by: