Bibliography on Tropospheric Propagation of Radio Waves
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The Art and Science of Forecasting Morning Temperature Inversions by Anthony J
Air Quality Forecasting Excl usive Con tent The Art and Science of Forecasting Morning Temperature Inversions by Anthony J. Sadar Anthony J. Sadar is a Certified Consulting Meteorologist and Air Pollution Administrator with the Allegheny County Health Department, Air Quality Program in Pittsburgh, PA. E-mail: [email protected]. The author provides an overview of the key resources and variables used to produce morning surface air inversion forecasts in Pittsburgh, PA. Although the focus is southwestern Pennsylvania, the forecasting approach can be applied to similar locations across the globe. Air quality in southwestern Pennsylvania, as in most other areas of the Accurate forecasting of the onset of an inversion would benefit areas world, is very much influenced by surface-based temperature inver - prone to strong and/or persistent inversions. Advanced notice of im - sions. An atmospheric temperature inversion occurs when air temper - pending stagnant air conditions would give government regulators, ature increases with increasing height. In the layer of air nearest the industry operators, and the public time to mitigate emissions, and earth’s surface—the troposphere—this situation is the inverse of the hence, pollutant concentrations, as well as reduce exposure to “normal” condition where a warm ground keeps low-lying air warmer elevated pollution levels. than air higher up. Normally then, the warm surface air can rise and the cool air aloft can descend, causing the atmosphere to mix. Detecting Inversions To collect temperature, wind, and other data with height, the National A surface-based (or ground-level) temperature inversion forms Weather Service (NWS) releases a balloon-borne measurement trans - when air close to the ground cools faster than air at a higher altitude. -
Numerical Modelling of VLF Radio Wave Propagation Through Earth-Ionosphere Waveguide and Its Application to Sudden Ionospheric Disturbances
Numerical Modelling of VLF Radio Wave Propagation through Earth-Ionosphere Waveguide and its application to Sudden Ionospheric istur!ances Thesis submitted for the degree of octor of Philosoph# (Science% in Ph#sics (Theoretical) of the &niversity of 'alcutta Su(a# Pal Ma#8, )*+, CERTIFICATE FROM THE SUPERVISOR This is to certify that the thesis entitled "Numerical Modelling of VLF Radio Wave Propagation through Earth-Ionosphere waveguide and its application to !udden Ionospheric Distur#ances", submitted by Mr. Sujay Pal who got his name registered on $%&$'&%$(( for the award of Ph.D. )!cience* degree of the Universit, of Calcutta. absolutely based upon his own work under the supervision of Professor !andip K. Cha0ra#arti and that neither this thesis nor any part of it has been submitted for any degree/diploma or any other academic award anywhere before. Prof. !andip K. -ha0ra#arti Senior Professor & Head Department of #strophysics & Cosmology S. N. Bose National Centre for Basic Sciences JD Block, Sector())), Salt *ake, +olkata 7---./, India TO My PARENTS i ABSTRACT Very Low Frequency (VLF) radio waves with frequency in the range 3 30 kHz ∼ propagate within the Earth-ionosphere waveguide (EIWG) for#ed $y the Earth as the %ower $oundary and the %ower ionosphere (50 100 k#) as the upper $oundary ∼ of the waveguide. These waves are generated from #an-#ade transmitters as wel% as fro# lightnings or other natura% sources( *tudy of these waves is very i#portant since they are the only tool to diagnose the %ower ionosphere( Lower part of the Earth+s ionosphere ranging &0 90 km is known as the -- ∼ region of the ionosphere( *olar Lyman-α radiation at '.'./ n# and EUV radiation in 80 '''.& n# are #ain%y responsib%e for for#ing the --region through the ∼ ionization of 123N 23O 2 during day time( The VLF propagation takes p%ace $etween the Earth+s surface and the --region at the day time. -
A Microcomputer Based Troposcatter Communications System Design Program
Calhoun: The NPS Institutional Archive Theses and Dissertations Thesis Collection 1985 TROPO: a microcomputer based troposcatter communications system design program. Siomacco, Edward Michael http://hdl.handle.net/10945/21592 DUDLEY KNOX LIBRARY NAVAL POSTG DUATE SCHOOL MONTEREY, CALIFORNIA 93943 NAVAL POSTGRADUATE SCHOOL Monterey, California THESIS TROPO: A MICROCOMPUTER BASED TROPOSCATTER CO^IMUNI CATIONS SYSTEM DESIGN PROGRAM by Edward Michael Siomacco September 19S5 Thesis Advisor: J. B. Knorr Approved for public release; distribution is unlimited T227031 SECURITY CLASSIFICATION OF THIS PACE (When Data Entered) READ INSTRUCTIONS REPORT DOCUMENTATION PAGE BEFORE COMPLETING FORM I. REPORT NUMBER 2. GOVT ACCESSION NO 3. RECIPIENT'S CATALOG NUMBER 4. TITLE (and Submit) 5. TYPE OF REPORT & PERIOD COVERED TROPO: A Microcomputer Based Master's Thesis; Troposcatter Communications September 1985 System Design Program 6. PERFORMING ORG. REPORT NUMBER 7. AUTHORf«> 8. CONTRACT OR GRANT NUMBER!"*; Edward Michael Siomacco 9. PERFORMING ORGANIZATION NAME ANO ADDRESS 10. PROGRAM ELEMENT. PROJECT, TASK AREA & WORK UNIT NUMBERS Naval Postgraduate School Monterey, California 93943-5100 II. CONTROLLING OFFICE NAME AND AOORESS 12. REPORT DATE Naval Postgraduate School September 1985 Monterey, California 93943-5100 13. NUMBER OF PAGES 161 U. MONITORING AGENCY NAME 6 ADDRESS)'// dlllerent Irom Controlling Office) 15. SECURITY CLASS, (ol thia report) UNCLASSIFIED 15«. DECLASSIFICATION/ DOWNGRADING SCHEDULE 16. DISTRIBUTION STATEMENT (ol thl» Report) Approved for public release; distribution is unlimited. 17. DISTRIBUTION STATEMENT (ol the abatract entered In Block 20, II dlllerent from Report) 10. SUPPLEMENTARY NOTES 19. KEY WORDS (Continue on ravaraa aide II neceeeary and Identity by block number) Troposcatter; Over-the-Horizon Communications; Height Gain; Tropospheric Ducting 20. -
Atmospheric Anisotrophy and Its Effect on the Delay Power Spectra of Tropospheric Scatter Radio Signals Hosny Mohammed Ibrahim Iowa State University
Iowa State University Capstones, Theses and Retrospective Theses and Dissertations Dissertations 1982 Atmospheric anisotrophy and its effect on the delay power spectra of tropospheric scatter radio signals Hosny Mohammed Ibrahim Iowa State University Follow this and additional works at: https://lib.dr.iastate.edu/rtd Part of the Electrical and Electronics Commons Recommended Citation Ibrahim, Hosny Mohammed, "Atmospheric anisotrophy and its effect on the delay power spectra of tropospheric scatter radio signals " (1982). Retrospective Theses and Dissertations. 7507. https://lib.dr.iastate.edu/rtd/7507 This Dissertation is brought to you for free and open access by the Iowa State University Capstones, Theses and Dissertations at Iowa State University Digital Repository. It has been accepted for inclusion in Retrospective Theses and Dissertations by an authorized administrator of Iowa State University Digital Repository. For more information, please contact [email protected]. INFORMATION TO USERS This reproduction was made from a copy of a document sent to us for microfilming. While the most advanced technology has been used to photograph and reproduce this document, the quality of the reproduction is heavily dependent upon the quality of the material submitted. The following explanation of techniques is provided to help clarify markings or notations which may appear on this reproduction. 1. The sign or "target" for pages apparently lacking from the document photographed is "Missing Page(s)". If it was possible to obtain the missing page(s) or section, they are spliced into the film along with adjacent pages. This may have necessitated cutting through an image and duplicating adjacent pages to assure complete continuity. -
ESSENTIALS of METEOROLOGY (7Th Ed.) GLOSSARY
ESSENTIALS OF METEOROLOGY (7th ed.) GLOSSARY Chapter 1 Aerosols Tiny suspended solid particles (dust, smoke, etc.) or liquid droplets that enter the atmosphere from either natural or human (anthropogenic) sources, such as the burning of fossil fuels. Sulfur-containing fossil fuels, such as coal, produce sulfate aerosols. Air density The ratio of the mass of a substance to the volume occupied by it. Air density is usually expressed as g/cm3 or kg/m3. Also See Density. Air pressure The pressure exerted by the mass of air above a given point, usually expressed in millibars (mb), inches of (atmospheric mercury (Hg) or in hectopascals (hPa). pressure) Atmosphere The envelope of gases that surround a planet and are held to it by the planet's gravitational attraction. The earth's atmosphere is mainly nitrogen and oxygen. Carbon dioxide (CO2) A colorless, odorless gas whose concentration is about 0.039 percent (390 ppm) in a volume of air near sea level. It is a selective absorber of infrared radiation and, consequently, it is important in the earth's atmospheric greenhouse effect. Solid CO2 is called dry ice. Climate The accumulation of daily and seasonal weather events over a long period of time. Front The transition zone between two distinct air masses. Hurricane A tropical cyclone having winds in excess of 64 knots (74 mi/hr). Ionosphere An electrified region of the upper atmosphere where fairly large concentrations of ions and free electrons exist. Lapse rate The rate at which an atmospheric variable (usually temperature) decreases with height. (See Environmental lapse rate.) Mesosphere The atmospheric layer between the stratosphere and the thermosphere. -
Propagation Analysis of a 900 Mhz Spread Spectrum Centralized Traffic Signal Control System
PROPAGATION ANALYSIS OF A 900 MH Z SPREAD SPECTRUM CENTRALIZED TRAFFIC SIGNAL CONTROL SYSTEM Brian L. Urban, AS, BS, EIT Thesis Prepared for the Degree of MASTER OF SCIENCE UNIVERSITY OF NORTH TEXAS May 2006 APPROVED: Perry McNeill, Major Professor Michael Kozak, Committee Member Shuping Wang, Committee Member Bernard Vokoun, Committee Member Vijay Vaidyanathan, Departmental Program Coordinator Albert B. Grubbs, Chair of the Department of Engineering Technology Oscar Garcia, Dean of the College of Engineering Sandra L. Terrell, Dean of the Robert B. Toulouse School of Graduate Studies Urban, Brian L., Propagation analysis of a 900 MHz spread spectrum centralized traffic signal control system. Master of Science (Engineering Technology), May 2006, 88 pp., 20 tables, 27 illustrations, references, 25 titles. The objective of this research is to investigate different propagation models to determine if specified models accurately predict received signal levels for short path 900 MHz spread spectrum radio systems. The City of Denton, Texas provided data and physical facilities used in the course of this study. The literature review indicates that propagation models have not been studied specifically for short path spread spectrum radio systems. This work should provide guidelines and be a useful example for planning and implementing such radio systems. The propagation model involves the following considerations: analysis of intervening terrain, path length, and fixed system gains and losses. Copyright 2006 by Brian L. Urban ii ACKNOWLEDGEMENTS I acknowledge the following people for their efforts and contributions to my thesis. It would not have been completed without them. Special thanks to the author’s thesis advisor, Dr. -
Anticyclones
Anticyclones Background Information for Teachers “High and Dry” A high pressure system, also known as an anticyclone, occurs when the weather is dominated by stable conditions. Under an anticyclone air is descending, maybe linked to the large scale pattern of ascent and descent associated with the Global Atmospheric Circulation, or because of a more localized pattern of ascent and descent. As shown in the diagram below, when air is sinking, more air is drawn in at the top of the troposphere to take its place and the sinking air diverges at the surface. The diverging air is slowed down by friction, but the air converging at the top isn’t – so the total amount of air in the area increases and the pressure rises. More for Teachers – Anticyclones Sinking air gets warmer as it sinks, the rate of evaporation increases and cloud formation is inhibited, so the weather is usually clear with only small amounts of cloud cover. In winter the clear, settled conditions and light winds associated with anticyclones can lead to frost. The clear skies allow heat to be lost from the surface of the Earth by radiation, allowing temperatures to fall steadily overnight, leading to air or ground frosts. In 2013, persistent High pressure led to cold temperatures which caused particular problems for hill sheep farmers, with sheep lambing into snow. In summer the clear settled conditions associated with anticyclones can bring long sunny days and warm temperatures. The weather is normally dry, although occasionally, localized patches of very hot ground temperatures can trigger thunderstorms. An anticyclone situated over the UK or near continent usually brings warm, fine weather. -
Recommendation ITU-R V.573-4
Rec. ITU-R V.573-5 1 RECOMMENDATION ITU-R V.573-5* Radiocommunication vocabulary (1978-1982-1986-1990-2000-2007) Scope This Recommendation provides the main vocabulary reference, giving synonymous terms in three languages and the associated definitions. It includes terms given in Article 1 of the Radio Regulations (RR) and extends the list to technical terms defined in texts of the ITU-R. The ITU Radiocommunication Assembly, considering a) that Article 1 of the Radio Regulations (RR) contains the definitions of terms for regulatory purposes; b) that the Radiocommunication Study Groups have a need to establish new and amended definitions for technical terms that do not appear in RR Article 1 or that are so defined as to be unsuitable for Radiocommunication Study Group purposes; c) that it would be desirable for some of these terms and definitions established by the Radiocommunication Study Groups to be more widely used within the ITU-R, recommends that the terms listed in RR Article 1 and in Annex 1 below should be used as far as possible with the meaning ascribed to them in the corresponding definition. NOTE 1 – Study Groups are invited, where there is a difficulty in using any of the terms with the meaning given in the corresponding definition, to forward to the Coordination Committee for Vocabulary (CCV) a proposal for revision or alternative application, accompanied by substantiating argument. NOTE 2 – A number of terms in this Recommendation appear also in RR Article 1 with a different definition. These terms are identified by (RR . ., MOD) or (RR . .(MOD)) if the modifications consist only of editorial changes. -
Radio Astronomy
Edition of 2013 HANDBOOK ON RADIO ASTRONOMY International Telecommunication Union Sales and Marketing Division Place des Nations *38650* CH-1211 Geneva 20 Switzerland Fax: +41 22 730 5194 Printed in Switzerland Tel.: +41 22 730 6141 Geneva, 2013 E-mail: [email protected] ISBN: 978-92-61-14481-4 Edition of 2013 Web: www.itu.int/publications Photo credit: ATCA David Smyth HANDBOOK ON RADIO ASTRONOMY Radiocommunication Bureau Handbook on Radio Astronomy Third Edition EDITION OF 2013 RADIOCOMMUNICATION BUREAU Cover photo: Six identical 22-m antennas make up CSIRO's Australia Telescope Compact Array, an earth-rotation synthesis telescope located at the Paul Wild Observatory. Credit: David Smyth. ITU 2013 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. - iii - Introduction to the third edition by the Chairman of ITU-R Working Party 7D (Radio Astronomy) It is an honour and privilege to present the third edition of the Handbook – Radio Astronomy, and I do so with great pleasure. The Handbook is not intended as a source book on radio astronomy, but is concerned principally with those aspects of radio astronomy that are relevant to frequency coordination, that is, the management of radio spectrum usage in order to minimize interference between radiocommunication services. Radio astronomy does not involve the transmission of radiowaves in the frequency bands allocated for its operation, and cannot cause harmful interference to other services. On the other hand, the received cosmic signals are usually extremely weak, and transmissions of other services can interfere with such signals. -
VLF Radio Observations and Modeling
INDIAN CENTRE FOR SPACE PHYSICS ANNUAL REPORT (2013-2014) TABLE OF CONTENTS Report of the Governing Body 3 Governing Body of the Centre 4 Members of the Research Advisory Council 4 Academic Council Members 4 In-Charge, Academic Affairs 4 Dean (Academic) and Finance Officer 4 Administrative Officer 4 Public Information Officer 5 In Charge of the Departments 5 Faculty Members 5 Honorary Faculty Members 5 Project Scientists 5 Post-Doctoral Fellows 5 Senior Research Fellows 5 Junior Research Fellows 6 ICTP Senior Research Fellow 6 Visiting Research Scholars 6 Engineers / Laboratory Staff 6 Office Staff 6 Security Staff 6 Research Facilities at the Head Quarter 7 Facilities at other branches of the Centre 7 Brief Profiles of the Scientists of the Centre 7 Research Work Published or Accepted for Publication 10 Books and In Books 14 Members of Scientific Societies/Committees 15 Ph.D. degree Received 15 Ph.D. Thesis Submitted 15 Course of lectures offered by ICSP members 15 Participation in National/International Conferences & Symposia 16 Workshops / Seminars / Conferences etc. organized 17 Visits abroad from the Centre 17 Major Visitors to the Centre 17 Collaborative Research and Project Work 17 M.Sc. projects guided by ICSP members 18 Summary of the Research Activities of the Scientists at the Centre 19 The ionospheric and earthquake research centre (IERC) 38 Activities of the Indian Centre for Space Physics, Malda Branch 40 Auditors Report to the Members 42 Published by: Indian Centre for Space Physics, Chalantika 43, Garia Station Road, Garia, Kolkata 700084 EPABX +91-33-2436-6003 and +91-33-2462-2153 Extension Numbers: Department of Ionospheric Science: 21 Department of Astrochemistry/Astrobiology: 22 Accounts: 23 Seminar Room: 24 Computer room: 25 Department of High Energy Radiation: 26 X-ray Laboratory: 27 Fax: +91-33-2462-2153 E-mail: [email protected] Website: http://csp.res.in Front Cover: Superposed photos of the earth taken from a camera on board a balloon borne mission and the sky at Ionospheric and Earthquake Research Center of ICSP taken by Mr. -
Development of Epstein-Peterson Method- Based Approach for Computing Multiple Knife Edgediffraction Loss As a Function of Refractivity Gradient
Journal of Multidisciplinary Engineering Science and Technology (JMEST) ISSN: 2458-9403 Vol. 6 Issue 9, September - 2019 Development Of Epstein-Peterson Method- Based Approach For Computing Multiple Knife Edgediffraction Loss As A Function Of Refractivity Gradient Akaninyene B. Obot1 Ukpong,Victor Joseph2 Department of Electrical/Electronic and Computer Department of Electrical/Electronic and Computer Engineering, University of Uyo, AkwaIbom, Nigeria Engineering, University of Uyo, AkwaIbom, Nigeria Kalu Constance3 Department of Electrical/Electronic and Computer Engineering, University of Uyo, AkwaIbom, Nigeria [email protected] Abstract— In this paper, the development of I. INTRODUCTION Epstein-Peterson method-based approach for Radio wave propagation over irregular computing multiple knife edge diffraction loss as a function of refractivity gradient. Specifically, the terrain consisting of mountain, buildings, hills study utilized Epstein Peterson diffraction loss and even trees and other high rising methodology alongside the International obstructions is of great concern to Telecommunication Union (ITU) knife edge communication network designers [1,2,3,4]. approximation model to compute multiple knife When a wireless signal is propagated over a edge diffraction loss as a function of refractivity gradient. Analytical expression for the long distance, the signal may get distorted and determination of obstacles height, the earth bulge attenuated due to obstacles along its path. This and the effective obstruction height were modeled causes the signal to be reflected, absorbed in terms of the refractivity gradient (∆). A case scattered or diffracted. Diffraction occurs when study of 10 knife edge obstructions located in a a wireless signal encounter obstacles in its path communication link with a path length of 36km was used as a numerical example to demonstrate [6,7,8,9,10]. -
Beyond-Line-Of-Sight Communications with Ducting Layer Ergin Dinc, Student Member, IEEE, Ozgur B
IEEE COMMUNICATIONS MAGAZINE 1 Beyond-Line-of-Sight Communications with Ducting Layer Ergin Dinc, Student Member, IEEE, Ozgur B. Akan, Senior Member, IEEE Abstract—Near-surface wave propagation at microwave fre- 8 :JR:`R IQ ].V`V quencies especially 2 GHz and above shows significant depen- dence on atmospheric ducts that are the layer in which rapid decrease in the refractive index occurs. The propagating signals in the atmospheric ducts are trapped between the ducting layer and the sea surface, so that the power of the propagating signals do not spread isotropically through the atmosphere. As a result, these signals have low path-loss and can travel over-the-horizon. V: Since atmospheric ducts are nearly permanent at maritime and coastal environments, ducting layer communication is a promis- 8 IQ ].V`1H%H ing method for beyond-Line-of-Sight (b-LoS) communications especially in naval communications. To this end, we overview %H 1J$:7V` the characteristics and the channel modeling approaches for the ducting layer communications by outlining possible open research areas. In addition, we review the possible utilization of the ducting layer in Network Centric Operations (NCO) to empower decision making for the b-LoS operations. V: Index Terms—Atmospheric ducts, ducting layer, refractivity, beyond-line-of-sight communications Fig. 1. Signal spreading in the standard atmosphere and the atmospheric duct. I. INTRODUCTION TMOSPHERIC ducts that are caused by rapid decrease Ducting layer studies mainly focus on refractivity estimation A in the refractive index of the lower atmosphere have techniques and radar path-loss calculations [1], [2]. However, tremendous effects on the near-surface wave propagation.