Sweep Frequency Oblique Ionospheric Sounding at Medium Frequencies PDF Download

Author: Stanford University. Stanford Electronics Laboratories
Publisher:
ISBN:
Category :
Languages : en
Pages : 16

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Author: North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Electromagnetic Wave Propagation Committee
Publisher:
ISBN:
Category : Ionospheric radio wave propagation
Languages : en
Pages : 588

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Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 776

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Author: Stanford University. Stanford Electronics Laboratories
Publisher:
ISBN:
Category :
Languages : en
Pages : 68

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Two methods of oblique-incidence ionospheric sounding--sweep-frequency cw and pulse--were compared over the 8000-km path from Hawaii to Mass. Three cw frequency sweep rates, 25, 100, and 1000 kHz/sec, were explored at various power levels between 1 and 10,000 w. The pulse sounder employed 100-used, 30-kw pulses at a repetition rate of 50 pulses/sec. The tests were conducted in December 1965. (Author).

Author: Fraidoon Mazda
Publisher: Butterworth-Heinemann
ISBN: 1483193799
Category : Technology & Engineering
Languages : en
Pages : 1140

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Telecommunications Engineer's Reference Book maintains a balance between developments and established technology in telecommunications. This book consists of four parts. Part 1 introduces mathematical techniques that are required for the analysis of telecommunication systems. The physical environment of telecommunications and basic principles such as the teletraffic theory, electromagnetic waves, optics and vision, ionosphere and troposphere, and signals and noise are described in Part 2. Part 3 covers the political and regulatory environment of the telecommunications industry, telecommunication standards, open system interconnect reference model, multiple access techniques, and network management. The last part deliberates telecommunication applications that includes synchronous digital hierarchy, asynchronous transfer mode, integrated services digital network, switching systems, centrex, and call management. This publication is intended for practicing engineers, and as a supplementary text for undergraduate courses in telecommunications.

Author: L. W. Turner
Publisher: Butterworth-Heinemann
ISBN: 1483161277
Category : Technology & Engineering
Languages : en
Pages : 1492

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Electronics Engineer's Reference Book, 4th Edition is a reference book for electronic engineers that reviews the knowledge and techniques in electronics engineering and covers topics ranging from basics to materials and components, devices, circuits, measurements, and applications. This edition is comprised of 27 chapters; the first of which presents general information on electronics engineering, including terminology, mathematical equations, mathematical signs and symbols, and Greek alphabet and symbols. Attention then turns to the history of electronics; electromagnetic and nuclear radiation; the influence of the ionosphere and the troposphere on the propagation of radio waves; and basic electronic circuits. The reader is also introduced to devices such as electron valves and tubes, integrated circuits, and solid-state devices. The remaining chapters focus on other areas of electronics engineering, including sound and video recording; electronic music and radio astronomy; and applications of electronics in weather forecasting, space exploration, and education. This book will be of value to electronics engineers and professionals in other engineering disciplines, as well as to scientists, students, management personnel, educators, and readers with a general interest in electronics and their applications.

Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 1014

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Author: James Robert Barnum
Publisher:
ISBN:
Category : Electronic data processing
Languages : en
Pages : 124

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Twenty-four hour high-resolution FMCW soundings taken over an East-West 1900-km forward-propagation path show unexpectedly complex mode structure near sunset. Because of the presence of 1- and 2-hop sporadic-E modes, it was suggested that multiple reflections from sporadic-E and F-layers--such as 'M' and 'N' modes--accounted for much of the unexplained structure. This work represents an attempt to see how well these 'mixed' modes can be understood by employing computer ray-tracing procedures developed by Dr. T.A. Croft. A simple beta-Chapman layer, with its parameters adjusted to give synthetic ionograms that matched the experimental 1- and 2-hop F-layer modes, proved to be an adequate model for the F-layer profile over the path. Reference to the calibrated experimental ionograms yielded values for the sporadic-E reflection heights for each time of day. Assuming no horizontal tilts in layer density and ignoring the earth's magnetic field, synthetic ionograms involving multiple F-layer and sporadic-E reflections were then computed. The model-experiment comparisons show that surprisingly accurate estimations of both 1- and 2-hop and mixed modes are possible, using only relatively simple computational procedures. Although similar work has been done in this area, the present study is novel in its use of calibrated oblique ionograms for model derivation. The work should lead to a better understanding of both HF forward and backscatter propagation studies which are plagued with multiple, interlayer propagation modes. (Author).

Author: Wayan Suparta
Publisher: Springer
ISBN: 9811065748
Category : Technology & Engineering
Languages : en
Pages : 341

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This book addresses space science and communication – one of the main pillars of space science sustainability, an area that has recently become of great importance. In this regard, research and development play a crucial role in sustainability development. However, obtaining essential data in the physical world to interpret the universe and to predict what could happen in the future is a challenging undertaking. Accordingly, providing valid information to understand trends, evaluate needs, and create sustainable development policies and programs in the best interest of all the people is indispensable. This book was prepared in conjunction with the fifth meeting of the 2017 International Conference on Space Science and Communication (IconSpace2017), held in Kuala Lumpur, Malaysia on 3-5 May 2017 to introduce graduate stuandents, researchers, lecturers, engineers, geospatialists, meteorologists, climatologists, astronomers and practitioners to the latest applications of space science, telecommunications, meteorology, remote sensing and related fields. The individual papers discuss a broad range of space science and technology applications, e.g. the formation of global warming from space, environmental and remote sensing, communication systems, and smart materials for space applications.

Author: Stanford University. Stanford Electronics Laboratories
Publisher:
ISBN:
Category :
Languages : en
Pages : 72

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A frequency-modulation, continuous-wave HF ionospheric sounder ('Chirp 1') was introduced in 1964. This equipment provided a considerable increase in system sensitivity over commonly used pulse sounders at a time-delay resolution of 10 microseconds. Experience with this equipment revealed a need for still greater time-delay resolution capability, plus easily selectable sweep frequency limits and rates, and an ability to sweep with either positive or negative slopes. In 1966, a second-generation equipment, 'Chirp 2', was developed. This report describes the differences between it and the 'Chirp 1' equipment. The salient characteristics of 'Chirp 2' are time-delay resolution of 1 microsecond or less, great flexibility in selection of sweep limits and sweep rates, and a choice of several sweep formats. The sweep phase discontinuities have been reduced to a level more than adequate for most ionospheric sounding work, but further reduction is needed in some applications. (Author).