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Author : Jules Aarons
Publisher :
ISBN 13 :
Total Pages : 40 pages
Book Rating : 4.3/5 ( download)
Download or read book Equatorial Scintillations written by Jules Aarons and published by . This book was released on 1976 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sunanda Basu
Publisher :
ISBN 13 :
Total Pages : 32 pages
Book Rating : 4.3/5 (91 download)
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).
Author : Jules Aarons
Publisher :
ISBN 13 :
Total Pages : 40 pages
Book Rating : 4.3/5 (91 download)
Download or read book Equatorial Scintillations written by Jules Aarons and published by . This book was released on 1976 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the advent of satellite communications systems at frequencies varying from approx. 140 to 1600 MHz, as well as navigation and ranging systems in the 1200 to 1600-MHz portions of the spectrum, the effect of equatorial irregularities on fading signals has become of importance. Recent observations of the signal statistics of scintillations at frequencies ranging from 136 MHz to 6 GHz reveal a power-law falloff of irregularity sizes. Power spectra are now available for a variety of conditions and for frequencies from vhf to microwaves. during periods of intense equatorial activity at frequencies to 360 MHz, Rayleigh scattering is frequently experienced.
Author : Jules Aarons
Publisher :
ISBN 13 :
Total Pages : 48 pages
Book Rating : 4.3/5 (91 download)
Download or read book Global Morphology of Ionospheric Scintillations written by Jules Aarons and published by . This book was released on 1970 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: Amplitude fluctuations produced by small irregularities in electron density in the F-layer of the ionosphere (at 300 to 400 km height) can be a problem to communication and navigation systems in the VHF-UHF range. Recent measurements, primarily by AFCRL, are shown with emphasis on results at high and equatorial latitudes. At high latitudes an irregularity region exists whose lower boundary reaches 57 degrees invariant latitude near midnight. During magnetic storms the boundary descends to lower latitudes and the fading becomes deeper. Over the polar cap scintillations are somewhat diminished. When observing synchronous satellites through the irregularity region, deep and fast fading is frequently seen, with fade rates to one per second. Irregularities produce deep scintillations in the VHF range plus or minus 15 degrees from the geomagnetic equator. In equatorial regions maximum occurrence of high level scintillations takes place between 2100 and 2400 local time during the equinoxes; a minimum occurrence is observed during the solstices. When the sunspot number decreases, the equatorial irregularity region spreads and becomes larger. The data for various latitudes has been placed in statistical form, that is, distribution of amplitudes for 15-min samples as well as for periods of 1 yr and longer. (Author).
Author : Air Force Cambridge Research Laboratories (U.S.)
Publisher :
ISBN 13 :
Total Pages : 400 pages
Book Rating : 4.3/5 ( download)
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 1970 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jules Aarons
Publisher :
ISBN 13 :
Total Pages : 252 pages
Book Rating : 4.3/5 (91 download)
Download or read book Ionospheric Radio Wave Propagation written by Jules Aarons and published by . This book was released on 1984 with total page 252 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Chao Huang
Publisher : John Wiley & Sons
ISBN 13 : 1119507553
Total Pages : 47 pages
Book Rating : 4.1/5 (195 download)
Download or read book Space Physics and Aeronomy, Ionosphere Dynamics and Applications written by Chao Huang and published by John Wiley & Sons. This book was released on 2021-05-11 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive review of global ionospheric research from the polar caps to equatorial regions It's more than a century since scientists first identified the ionosphere, the layer of the Earth’s upper atmosphere that is ionized by solar and cosmic radiation. Our understanding of this dynamic part of the near-Earth space environment has greatly advanced in recent years thanks to new observational technologies, improved numerical models, and powerful computing capabilities. Ionosphere Dynamics and Applications provides a comprehensive overview of historic developments, recent advances, and future directions in ionospheric research. Volume highlights include: Behavior of the ionosphere in different regions from the poles to the equator Distinct characteristics of the high-, mid-, and low-latitude ionosphere Observational results from ground- and space-based instruments Ionospheric impacts on radio signals and satellite operations How earthquakes and tsunamis on Earth cause disturbances in the ionosphere The American Geophysical Union promotes discovery in Earth and space science for the benefit of humanity. Its publications disseminate scientific knowledge and provide resources for researchers, students, and professionals. Find out more about the Space Physics and Aeronomy collection in this Q&A with the Editors in Chief
Author : John M. Goodman
Publisher :
ISBN 13 :
Total Pages : 716 pages
Book Rating : 4.3/5 (121 download)
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:
Author : Jules Aarons
Publisher :
ISBN 13 :
Total Pages : 130 pages
Book Rating : 4.3/5 (91 download)
Download or read book A Survey of Scintillation Data and Its Relationship to Satellite Communications written by Jules Aarons and published by . This book was released on 1970 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contents: VHF atmospheric studies and communications and navigation systems; The definition of scintillation index and its use for characterizing ionospheric effects; Summary of properties of F-region irregularities; Application of the statistics of ionospheric scintillation to VHF and UHF systems; Special problems in scintillations; and Propagation delays of VHF waves.
Author : Jules Aarons
Publisher :
ISBN 13 :
Total Pages : 30 pages
Book Rating : 4.3/5 (91 download)
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.
Author : H. E. Whitney
Publisher :
ISBN 13 :
Total Pages : 146 pages
Book Rating : 4.3/5 (91 download)
Download or read book Report on Peru Scintillation Tests written by H. E. Whitney and published by . This book was released on 1977 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: A large scale test program was developed jointly by AFGL and AFAL to evaluate the effects of equatorial ionospheric irregularities on UHF (250 MHz) satellite communications to map the temporal and spatial extent of the equatorial scintillation region, and to determine the geophysical mechanisms leading to the formation of irregularities in the equatorial ionosphere and thus to scintillations. Of specific interest were scintillation characteristics and effects observed by airborne terminals and their relation to simultaneously obtained results from ground based terminals. The test results are based on radio propagation and geophysical measurements conducted from ground and airborne stations and show the general scintillation patterns, latitudinal dependence, heading dependence and signal statistics. Backscatter measurements from the Jicamarca radar and optical observations from the all sky imaging photometer show the development and motion of the irregularity structure. Scintillation plots for several satellites received at the ground stations and on the aircraft are included. (Author).
Author : John M. Goodman
Publisher :
ISBN 13 :
Total Pages : 520 pages
Book Rating : 4.:/5 (31 download)
Download or read book Effect of the Ionosphere on Space Systems and Communications written by John M. Goodman and published by . This book was released on 1975 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Richard Frank Donnelly
Publisher :
ISBN 13 :
Total Pages : 736 pages
Book Rating : 4.F/5 ( download)
Download or read book Solar-terrestrial Predictions Proceedings 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:
Author : Richard Frank Donnelly
Publisher :
ISBN 13 :
Total Pages : 736 pages
Book Rating : 4.:/5 (3 download)
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:
Author : Richard Frank Donnelly
Publisher :
ISBN 13 :
Total Pages : 744 pages
Book Rating : 4.3/5 (91 download)
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 744 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Rajat Acharya
Publisher : Academic Press
ISBN 13 : 0128097337
Total Pages : 324 pages
Book Rating : 4.1/5 (28 download)
Download or read book Satellite Signal Propagation, Impairments and Mitigation written by Rajat Acharya and published by Academic Press. This book was released on 2017-08-09 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt: Satellite Signal Propagation, Impairments and Mitigation covers issues related to satellite link design. The book develops every concept from elementary physics, covering the basics of signal propagation from Maxwell's equations and then gradually developing the physical reasons for impairments. It emphasizes the unique concepts for each involved process, based on their physics, and explains how they form the determining factors for the related suitable engineering technique for mitigation. Every basic principle is followed by mathematical substantiation with an explanation of the physics behind the equations. - Covers the basics of signal propagation, starting from Maxwell's equations and then gradually developing the physical reasons for the impairments - Includes different important propagation experiments conducted and detailed in the Appendix - Employs the power of MATLAB® as both a visualization and problem-solving tool - Provides MATLAB scripts for simulation exercises
Author : Dogan Ugur Sanli
Publisher : BoD – Books on Demand
ISBN 13 : 178984925X
Total Pages : 152 pages
Book Rating : 4.7/5 (898 download)
Download or read book Accuracy of GNSS Methods written by Dogan Ugur Sanli and published by BoD – Books on Demand. This book was released on 2019-01-16 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: Following the GPS, new GNSS techniques are emerging today. Various surveying and processing methods are available for the analysis of GNSS data. Equipment and software are also varied. The orbit quality, controlled by the system designer, and the IGS are continuously improved. The user is mainly interested in the quality of position and of the deformation rates produced by the GNSS. Hence, research needs to guide the user in terms of selecting the best combination of the available methods and instrumentation to produce the desired accuracy. This book reviews the current available accuracy obtainable using the GNSS methods. In fact, the main aim of this book is to make an impact on young researchers so that they keep updating the accuracy of GNSS for future generations.
