Notes on the Relationship of Scintillation Index to Probability Distributions and Their Uses for System Design PDF Download
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Author: H. E. Whitney
Publisher:
ISBN:
Category : Air Force Cambridge Research Laboratories (U.S.)
Languages : en
Pages : 28
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Book Description
The characterization of ionosphere scintillations in terms of scintillation index is discussed. Scintillation index cannot be directly applied to the design of systems that use transionospheric propagation. The relationships of scintillation index to system design parameters, cumulative amplitude distributions, and fade levels, are shown. The determination of a spectral index is explained and its use for extrapolating the results of ionosphere scintillation measurements to a desired frequency is shown.
Author: H. E. Whitney
Publisher:
ISBN:
Category : Air Force Cambridge Research Laboratories (U.S.)
Languages : en
Pages : 28
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Book Description
The characterization of ionosphere scintillations in terms of scintillation index is discussed. Scintillation index cannot be directly applied to the design of systems that use transionospheric propagation. The relationships of scintillation index to system design parameters, cumulative amplitude distributions, and fade levels, are shown. The determination of a spectral index is explained and its use for extrapolating the results of ionosphere scintillation measurements to a desired frequency is shown.
Author:
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ISBN:
Category : Environmental geology
Languages : en
Pages : 402
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 952
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Author:
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ISBN:
Category : Artificial satellites
Languages : en
Pages : 638
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Book Description
Author: Sunanda Basu
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ISBN:
Category : F region
Languages : en
Pages : 32
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Book Description
In situ measurements of F-region irregularity amplitude and ambient electron density made by the retarding potential analyzer (RPA) on OGO-6 near perigee altitude of 400 km have been utilized to derive the variation of electron density deviation over the equatorial region. Based on these measured electron density deviations and other assumed model parameters, including a three-dimensional power-law form of irregularity spectrum of index 4, a model of equatorial scintillations is developed in the framework of diffraction theory. The percentage occurrence contours of estimated equatorial scintillations greater than or equal to 4.5 dB at 140 MHz during 1900 to 2300 LMT for the period November to December 1969 and 1970 have been derived. The model is found to depict a pronounced longitude variation with the scintillation belt width and percentage occurrence being maximum over the African sector. The latitude extent of the spatial scintillation belt narrows over the American sector without much decrease in the scintillation occurrence whereas over the Indian and Far Eastern sectors both the extent and the occurrence are found to decrease. The percentage occurrence of scintillations estimated from this model is found to be consistent with VHF scintillation measurements at Ghana, Huancayo, and Calcutta. In addition, the model was found to be in qualitative agreement with GHz observations at various longitudes made by the COMSAT group. The effect of varying model parameters on scintillation estimates at VHF, UHF and GHz are discussed. Implications of the observed longitudinal variation of scintillations on current theories of equatorial irregularity formation are indicated. (Author).
Author: Richard Frank Donnelly
Publisher:
ISBN:
Category : Geophysics
Languages : en
Pages : 744
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Author: Richard Frank Donnelly
Publisher:
ISBN:
Category : Cosmic physics
Languages : en
Pages : 736
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Book Description
Author: Richard Frank Donnelly
Publisher:
ISBN:
Category : Cosmic physics
Languages : en
Pages : 736
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Book Description
Author: Air Force Cambridge Research Laboratories (U.S.)
Publisher:
ISBN:
Category : Geophysics
Languages : en
Pages : 336
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Author: Jules Aarons
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ISBN:
Category : F region
Languages : en
Pages : 30
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Book Description
Updating a review of the global morphology of ionospheric scintillations published in 1971, this study adds additional experimental studies on familiar topics to newer types of measurements of ionospheric irregularities, including in situ experiments and artificial heating of the F-layer.
