Download or read book Measurements of Trans ionospheric Propagation Parameters in the Polar Cap Ionosphere written by John A. Klobuchar and published by . This book was released on 1987 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements of absolute TEC (Total Electron Content), were made for the first time from the polar cap station located at Thule, Greenland in early 1984 using dual-frequency group delay measurements from high orbit satellites. Measurements of L-band amplitude scintillation and dual-frequency differential carrier phase scintillation were also made. The variability of the TEC was extremely large, with increases above the background values of more than 100 percent observed frequently. Quasi-periodic TEC enhancements with periods as short as 10 min and with amplitudes exceeding 10**17 el/m**2 column were seen over several time intervals of more than two hours. The absolute values of TEC observed in the dark polar cap ionosphere at times exceeded the diurnal maximum values from the mid-latitude ionosphere during this initial period of observations.
Download or read book Measurements of Trans ionospheric Propagation Parameters in the Polar Cap Ionosphere written by and published by . This book was released on 1987 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements of absolute TEC (Total Electron Content), were made for the first time from the polar cap station located at Thule, Greenland in early 1984 using dual-frequency group delay measurements from high orbit satellites. Measurements of L-band amplitude scintillation and dual-frequency differential carrier phase scintillation were also made. The variability of the TEC was extremely large, with increases above the background values of more than 100 percent observed frequently. Quasi-periodic TEC enhancements with periods as short as 10 min and with amplitudes exceeding 10**17 el/m**2 column were seen over several time intervals of more than two hours. The absolute values of TEC observed in the dark polar cap ionosphere at times exceeded the diurnal maximum values from the mid-latitude ionosphere during this initial period of observations.
Download or read book Measurements of Trans ionospheric Propagation Parameters in the Polar Cap Ionosphere written by and published by . This book was released on 1987 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurements of Trans Ionospheric Effects Using Signals from GPS written by G. J. Bishop and published by . This book was released on 1990 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Effects of the ionosphere can be significant to modern RF systems which depend on trans-ionospheric signal propagation. Delay effects caused by ionospheric total electron content, (TEC), and scintillation effects due to small-scale ionospheric irregularities, are of particular importance since they can, for example, cause ranging errors and signal or target fades. Signals from the Global Positioning System (GPS) satellites will provide the opportunity to measure TEC and scintillation parameters on a continuous basis in several directions from anywhere on earth. GPS signals have been used since 1984 to make measurements of polar cap TEC and L-Band scintillation, at Thule, Greenland. Concurrent observations of amplitude fading at 250 MHz link these GPS measurements to a large data base of polar scintillation at that frequency. Examples of these data will be given which illustrate the extreme variability of the polar cap ionosphere, which can be a significant limitation to trans-ionospheric systems which must operate in this part of the world. This paper will also review ionospheric measurement capability of GPS receivers using the full GPS P-code capability, contrasted with newer, less costly, instruments which make much more limited measurements without requiring knowledge of the GPS P-codes.
Download or read book Ionospheric Radio Propagation written by Kenneth Davies and published by . This book was released on 1965 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Advanced System for Measurement of Transionospheric Radio Propagation Effects Using GPS Signals written by G. J. Bishop and published by . This book was released on 1987 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: An advanced system for measurement of transionospheric radio propagation effects was developed, utilizing the TI-4100 four-channel Global Positioning System (GPS) receiver. During AFGL's Polar ARCS campaign at Sondrestrom, Greenland in February-March 1987, the system successfully measured ionospheric total electron content (TEC), phase scintillation, and amplitude scintillation on both GPS carrier frequencies, from up to four satellites simultaneously. This was the first time it has been possible to measure these parameters simultaneously, in multiple directions, in the high-latitude regions. Coupled with the simultaneous optical and incoherent scatter radar diagnostics obtained during the Polar ARCS campaign, these measurements significantly improve our capability to characterize high latitude ionospheric structures, particularly their temporal and spatial variation. Additionally, the development of this advanced system has contributed significantly to the technology base for specification of the Transionospheric Sensing System (TISS) for the Air Weather Service. The system can also be software upgraded to perform special navigation in addition to ionospheric measurements in airborne applications.
Download or read book Technical Reports Awareness Circular TRAC written by and published by . This book was released on 1988-04 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1988 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
Download or read book Ionospheric Radio Communications written by Norway. Forsvarets forskningsinstitutt and published by New York : Plenum Press. This book was released on 1968 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 1460 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book Ionospheric Radio Wave Propagation written by Jules Aarons and published by . This book was released on 1984 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ionospheric Structure and Variability on a Global Scale and Interactions with Atmosphere and Magnetosphere written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Electromagnetic Wave Propagation Panel. Symposium and published by . This book was released on 1989 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt: Communications, Navigation and Surveillance Systems operating in/through the aerospace EM propagation environment are affected by the state/variability of the propagation media. The range of phenomena need for their elucidation, observations and analysis on a global scale since only an understanding of the complex global interaction can improve the means of predictability and assessment of localized phenomena suggesting methods for mitigating adverse propagation conditions. With this goal, ionospheric dynamics, ionosphere/magnetosphere and ionosphere/atmosphere interactions were analysed and discussed at this symposium.
Download or read book Effects of Ionospheric Scattering on Very Long Distance Radio Communication written by H.A. Whale and published by Springer. This book was released on 2013-12-01 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Space Weather Telecommunications written by John M. Goodman and published by Springer Science & Business Media. This book was released on 2004-12-10 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: Space weather has an enormous influence on modern telecommunication systems even though we may not always appreciate it. We shall endeavor throughout this monograph to expose the relationships between space weather factors and the performance (or lack thereof) of telecommunication, navigation, and surveillance systems. Space weather is a rather new term, having found an oMicial expression as the result of several government initiatives that use the term in the title of programs. But it is the logical consequence of the realization that space also has weather, just as the lower atmosphere has weather. While the weather in space will influence space systems that operate in that special environment, it is also true that space weather will influence systems that we understand and use here on terra firma. This brings space weather home as it were. It is not some abstract topic of interest to scientists alone; it is a topic of concern to all of us. I hope to make this clear as the book unfolds. Why have I written this book? First of all, I love the topic. While at the Naval Research Laboratory (NRL), I had the opportunity to do research on many topics including: Thomson scatter radar and satellite beacon studies of the ionosphere, utilization of the NASA Gemini platform for ionospheric investigations, microwave radar propagation studies, I-IF signal intercept and direction-finding experiments, and multi-disciplinary studies of certain physical phenomena relevant to weapon systems development.
Download or read book Air Force Research Resum s written by and published by . This book was released on with total page 854 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1975 with total page 744 pages. Available in PDF, EPUB and Kindle. Book excerpt:
