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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 29
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 29
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Book Description
Author: Chas. R. Burrows
Publisher: Academic Press
ISBN: 1483258548
Category : Science
Languages : en
Pages : 561
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Book Description
Radio Wave Propagation: Consolidated Summary Technical Report of the Committee on Propagation of the National Defense Research Committee presents all the scientific information and report of experiments. This book discusses the problems encountered in the propagation of radio waves. Organized into three volumes, this book begins with an overview of the technical developments in the study of tropospheric propagation. This text then outlines the general theory of standard and nonstandard propagation together with descriptions and results of transmission experiments designed to test the theory. Other chapters consider the more unusual problems concerning the radar behavior of targets. This book discusses as well the problems of radio wave propagation in the standard atmosphere at frequencies above 30 megacycles. The final chapter deals with the selection and utilization of local terrain features that affect propagation and the performance of equipment. This book is a valuable resource for scientists and engineers in the field of radio wave propagation.
Author: United States. National Bureau of Standards
Publisher:
ISBN:
Category : Ionospheric radio wave propagation
Languages : en
Pages : 804
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Book Description
Author: United States. Office of Scientific Research and Development. National Defense Research Committee
Publisher:
ISBN:
Category : Meteorology
Languages : en
Pages : 572
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Book Description
Radiowellen, Frequenzverteilung, Funkwellen.
Author: John I. Videberg
Publisher:
ISBN:
Category : Ionospheric radio wave propagation
Languages : en
Pages : 70
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Book Description
A study was undertaken to investigate the existence and properties of waves guided under the D-layer in low-loss Whispering Gallery or earth-detached modes at MF to LF. These low-loss paths are the result of focusing of rays reflected below the curved ionosphere, together with a marked decrease in ionospheric reflection loss at the highly oblique incidence angles obtainable only from high altitudes. Theory and calculations indicated an enhancement of this phenomenon during ionispheric disturbances and suggested a feasibility test. A low-power transmission experiment lasting over 30 hr was successfully conducted between balloons separated by 1000 miles at an altitude of 35 km on 220 and 440 kHz. Signals were received on the balloon path over most of the day and night. Total path attenuations varied from 3 to 30 dB below free space. Maximum signal height gains ranging from 40 to 60 dB relative to an equivalent ground-to-ground path were measured. (Modified author abstract).
Author: United States. Office of Scientific Research and Development. National Defense Research Committee. Committee on Propagation
Publisher:
ISBN:
Category : Radio waves
Languages : en
Pages : 340
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Book Description
Author: W. T. Blackband
Publisher: Elsevier
ISBN: 1483280004
Category : Technology & Engineering
Languages : en
Pages : 493
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Book Description
Propagation of Radio Waves at Frequencies Below 300 KC/S covers the proceedings of the Seventh Meeting at the AGARD Ionospheric Research Committee, held in Munich, Germany on September 17-21, 1962. This book is organized into eight parts encompassing 32 chapters. The first parts deal with research studies concerning the electron density distribution and some properties of the lower ionosphere, as well as the effect of D-layer irregularities on radio wave propagation. The next parts explore the low frequency propagation in the lower ionosphere, the measurement of oblique incidence, and the statistical frequency spectrum of radio noise below 300 kc/s. The remaining chapters discuss the diurnal changes, the statistical prediction, the mode theory, and the propagation of very and extremely low frequency radio waves in the ionosphere. These chapters also examine the Earth resonance. This book will prove useful to astronomers, astrophysicists, and space scientists.
Author: United States. National Bureau of Standards
Publisher:
ISBN:
Category : Ionospheric radio wave propagation
Languages : en
Pages : 914
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1126
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Book Description
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.
Author: Artem Saakian
Publisher: Artech House
ISBN: 1630818453
Category : Technology & Engineering
Languages : en
Pages : 422
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Book Description
This completely updated second edition of an Artech House classic provides a thorough introduction to the basic principles of electromagnetic wave propagation of radio frequencies in real-world conditions, fully updated by including new achievements in theory and technology. It serves as an invaluable daily reference for practitioners in the field and as a complete, organized text on the subject. This comprehensive resource covers a wide range of essential topics, from the classification of radio waves, electromagnetic wave theory, and antennas for RF radio links, to the impact of the earth surface on the propagation of ground waves, atmospheric affects in radio wave propagation, and radio wave reception. The book explores the propagation of the ground radio waves, namely the waves that propagate in vicinity of the earth's surface (e.g., guided by that interface), without involvement of any atmospheric effects. Specifics of the high-frequency (HF) radio propagation due to reflections from ionospheric layers is studied, based on commonly used models of the ionospheric vertical profiles. Scattering of the radio waves of UHF and higher frequency bands from the random variations of the tropospheric refraction index (from tiny air turbulences) are also considered by using the principles of statistical radio-physics. Analysis of propagation conditions on real propagation paths, including analysis of the power budget of the VHF/UHF link to assure its stability (percentage of availability within observation time frame), terrestrial, broadcast, mobile, and satellite RF links are presented. The engineering design of the cellular networks, including LTE 4G, 5G and upcoming higher generations is explored. HF propagation predictions for extremely long-range links design for commercial and military applications are explained. Packed with examples and problems, this book provides a theoretical background for astrophysical, aeronomy and geophysical instrumentation design.
