“computers” or “ice cream.” While these may be important‚ they are definitely not the most important. By far‚ satellites are the most important objects today. Most everything‚ including smartphones and computers‚ are present today because of satellites and have capabilities such as Wi-Fi and 4G because of the role satellites play. Even Socrates‚ who lived centuries before the first satellite‚ realized the importance of a view from space when he said‚ "Man must rise above the Earth…to the top of the
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Satellite A satellite is defined as any object that orbits any other object. Satellites can be celestial‚ such as a moon orbiting a planet in the solar system‚ or a planet in the solar system orbiting the sun. Satellites can also be man-made. Man-made satellites are typically launched into outer space from earth to collect data‚ photos and other information about Earth and all the many things that exist around it. FLOW OF CONTENTS
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Communication Satellites Introduction Communications Satellites have been around since 1958. A communications satellite is a spacecraft that orbits the Earth and relays messages‚ radio‚ telephone and television signals. Stations on the ground‚ called earth stations‚ transmit signals to the satellite‚ which then relays the signal to other earth stations. As a newer form of communications‚ communications satellites are very useful in bringing the people in the world together. Communications between
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1 SATELLITE COMMUNICATION – AN INTRODUCTION Contents 1.1 Introduction 1.2 Basics 1.3 Applications of Satellites o Weather Forecasting o Radio and TV Broadcast o Military o Navigation o Global Telephone o Connecting Remote Areas o Global Mobile Communication 1.4 Frequency Allocation of Satellites 1.5 Types of Orbits o GEO o LEO o MEO o Sun Synchronous Orbit o Hohmann Transfer Orbit o Prograde Orbit o Retrograde Orbit o Polar Orbits 1.6 Examples o INTELSAT o U.S. Domsats o Polar Orbiting Satellites
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Artificial satellites are those put into orbit by man. Equipment on a satellite is hardened to survive in the radiation and vacuum of space. Since there is no air in space and therefore no air resistance‚ satellites come in many shapes and sizes. Types of Satellites and their Uses We use satellites for different purposes and all satellites can be placed in one of the following categories: Communications Satellites Distribution of television and audio signals‚ and telephone connections via satellite
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Subject : Introduction to satellite (SCM01D4) Introduction Eclipses can only occur when the Sun‚ Earth‚ and Moon are all in a straight line. Solar occur at new moon‚ when the Moon is between the Sun and Earth and in contrast‚ lunar eclipses occur at full moon‚ when Earth is between the Sun and Moon. The apparent size of the Moon is roughly the same as that of the Sun‚ with both being viewed at close
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SATELLITE COMMUNICATIONS SATELLITE COMMUNICATIONS - AN OVERVIEW INTRODUCTION The outer space has always fascinated people on the earth and communication through space evolved as an offshoot of ideas for space travel. The earliest idea of using artificial satellites for communications is found in a science fiction Brick Moon by Edward Evert Hale‚ published in 1869-70. While the early fictional accounts of satellite and space communications bear little resemblance to the technology as it exists
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History of Satellite Communications The first idea of satellite communication came from an article in 1945 named Wireless World‚ where Author C. Clarke described the use of manned satellites in 24 hour orbits to distribute television programs. However‚ the first person to carefully evaluate the technical and financial aspects of such a venture was John R. Pierce of Bell Telephone Laboratories (Whalen‚ n.d.). In a 1954 speech and 1955 article‚ Pierce described the usefulness of a communications
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Satellite Communication Engineering Michael O. Kolawole Jolade Pty. Ltd. Melbourne‚ Australia Marcel Dekker‚ Inc. TM New York • Basel Copyright © 2002 by Marcel Dekker‚ Inc. All Rights Reserved. ISBN: 0-8247-0777-X This book is printed on acid-free paper. Headquarters Marcel Dekker‚ Inc. 270 Madison Avenue‚ New York‚ NY 10016 tel: 212-696-9000; fax: 212-685-4540 Eastern Hemisphere Distribution Marcel Dekker AG Hutgasse 4‚ Postfach 812‚ CH-4001 Basel‚ Switzerland tel: 41-61-261-8482; fax: 41-61-261-8896
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History changed on October 4‚ 1957‚ when the former Soviet Union successfully launched Sputnik I. The world’s first artificial satellite was about the size of a basketball‚ weighed only 183 pounds‚ and took about 98 minutes to orbit the Earth on its elliptical path. That launch ushered in new political‚ military‚ technological‚ and scientific developments. While the Sputnik launch was a single event‚ it marked the start of the space age and the U.S.-U.S.S.R space race. The story begins in 1952
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