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Notes On The Relationship Of Scintillation Index To Probability Distributions And Their Uses For System Design
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Book Synopsis Notes on the Relationship of Scintillation Index to Probability Distributions and Their Uses for System Design by : H. E. Whitney
Download or read book Notes on the Relationship of Scintillation Index to Probability Distributions and Their Uses for System Design written by H. E. Whitney and published by . This book was released on 1974 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1987 with total page 952 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Radio Science written by and published by . This book was released on 1995 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A High-latitude Empirical Model of Scintillation Excursions by : Jules Aarons
Download or read book A High-latitude Empirical Model of Scintillation Excursions written by Jules Aarons and published by . This book was released on 1976 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: Using observations of the scintillations of beacons from synchronous satellites, a high latitude model of scintillation excursion is being developed. Phase 1 of the development has been completed and is described in this report. Several years of continuous recordings taken at Narssarssuaq, Greenland, Goose Bay, Labrador, and Sagamore Hill, Massachusetts, were reduced. The data base consists of values of 15-min scintillation excursions in dB at 137 MHz. Equations are developed which yield scintillations at this frequency as a function of local time, magnetic index, solar flux, and month of the year. The concept is to predict, at sub-auroral and auroral latitudes, scintillation at this frequency and at higher frequencies. The aim is to give to users an indication of expected scintillation excursion when one predicts magnetic activity and solar radio flux. The equations developed have been checked with one additional set of observations and are being checked with additional data. Phase 2 of this model will incorporate geometrical terms to take account of the propagation angle of the observer vis-a-vis the irregularities and will allow for frequency dependence to be ascertained. In addition, it is expected in Phase 2 to validate the model with additional sets of data, extending the model to auroral latitudes greater than 63 deg. and to polar latitudes. (Author).
Book Synopsis Report on Research at AFCRL. by : Air Force Cambridge Research Laboratories (U.S.)
Download or read book Report on Research at AFCRL. written by Air Force Cambridge Research Laboratories (U.S.) and published by . This book was released on 1972 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Environmental Research Papers written by and published by . This book was released on with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 250 MHz/GHz Scintillation Parameters in the Equatorial, Polar and Auroral Environments by : Santimay Basu
Download or read book 250 MHz/GHz Scintillation Parameters in the Equatorial, Polar and Auroral Environments written by Santimay Basu and published by . This book was released on 1986 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ionospheric scintillation effects encountered in the equatorial anomaly crest, polar cap and auroral regions have been contrasted to provide information for the design and evaluation of the performance of satellite communication links in ghese regions. The equatorial anomaly region is identified as the most disturbed irregularity environment where the amplitude and phase structures of VHF/L-band scintillations are primarily dictated by the strength of scattering rather than ionospheric motion. In the anomaly region, the spectra of intense amplitude scintillations at VHF and L-band are characterized by uniform power spectral density from the lowest frequency (10 MHz) to 4 Hz at VHF and to 1 Hz at L-band and steep rolloff at higher fluctuation frequencies with power law indices of -5 to 07. Such structures are compatible with intensity decorrelation times of 0.1 and 0.3 sec at VHF and L-band frequencies, respectively. The phase spectra are described by power law variation of psd with frequency with typical spectral indices of -2. 4. The strong scattering at VHF induces extreme phase rates of 200 deg. in 0.1 sec. The 90th percentile values of rms phase deviation at 250 MHz with 100-sec detrend are found to be 16 rads in the early evening hours whereas amplitude scintillation can cover the entire dynamic range of 30 dB not only at 250 MHz but at L-band as well.
Book Synopsis Model of Equatorial Scintillations from in Situ Measurements by : Sunanda Basu
Download or read book Model of Equatorial Scintillations from in Situ Measurements written by Sunanda Basu and published by . This book was released on 1976 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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).
Book Synopsis Effect of the Ionosphere on Space and Terrestrial Systems by :
Download or read book Effect of the Ionosphere on Space and Terrestrial Systems written by and published by . This book was released on 1978 with total page 638 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Environmental Factors in Electronic Warfare Related to Aerospace Systems by :
Download or read book Environmental Factors in Electronic Warfare Related to Aerospace Systems written by and published by . This book was released on 1996 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of the Ionosphere on C3I Systems by :
Download or read book Effect of the Ionosphere on C3I Systems written by and published by . This book was released on 1985 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Solar-terrestrial Predictions Proceedings: Prediction of terrestrial effects of solar activity by : Richard Frank Donnelly
Download or read book Solar-terrestrial Predictions Proceedings: Prediction of terrestrial effects of solar activity written by Richard Frank Donnelly and published by . This book was released on 1979 with total page 736 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Global Morphology of Ionospheric Scintillations II by : Jules Aarons
Download or read book Global Morphology of Ionospheric Scintillations II written by Jules Aarons and published by . This book was released on 1975 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Prediction of terrestrial effects of solar activity by : Richard Frank Donnelly
Download or read book Prediction of terrestrial effects of solar activity written by Richard Frank Donnelly and published by . This book was released on 1979 with total page 736 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Working group reports and reviews by : Richard Frank Donnelly
Download or read book Working group reports and reviews written by Richard Frank Donnelly and published by . This book was released on 1979 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Effect of the Ionosphere on Communication, Navigation, and Surveillance Systems by : John M. Goodman
Download or read book The Effect of the Ionosphere on Communication, Navigation, and Surveillance Systems written by John M. Goodman and published by . This book was released on 1988 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Solar-terrestrial Predictions Proceedings: Working group reports and reviews by : Richard Frank Donnelly
Download or read book Solar-terrestrial Predictions Proceedings: Working group reports and reviews written by Richard Frank Donnelly and published by . This book was released on 1979 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt:
