Early conceptions
The first fictional depiction of a satellite being launched into orbit is a short story by Edward Everett Hale, The Brick Moon. The story was serialized in The Atlantic Monthly, starting in 1869. The idea surfaces again in Jules Verne's The Begum's Millions (1879).
In 1903 Konstantin Tsiolkovsky (1857–1935) published Исследование мировых пространств реактивными приборами (The Exploration of Cosmic Space by Means of Reaction Devices), which is the first academic treatise on the use of rocketry to launch spacecraft. He calculated the orbital speed required for a minimal orbit around the Earth at 8 km/s, and that a multi-stage rocket fueled by liquid propellants could be used to achieve this. He proposed the use of liquid hydrogen and liquid oxygen, though other combinations can be used.
In 1928 Herman Potočnik (1892–1929) published his sole book, Das Problem der Befahrung des Weltraums - der Raketen-Motor (The Problem of Space Travel — The Rocket Motor), a plan for a breakthrough into space and a permanent human presence there. He conceived of a space station in detail and calculated its geostationary orbit. He described the use of orbiting spacecraft for detailed peaceful and military observation of the ground and described how the special conditions of space could be useful for scientific experiments. The book described geostationary satellites (first put forward by Tsiolkovsky) and discussed communication between them and the ground using radio, but fell short of the idea of using satellites for mass broadcasting and as telecommunications relays.
In a 1945 Wireless World article the English science fiction writer Arthur C. Clarke (1917-2008) described in detail the possible use of communications satellites for mass communications.Clarke examined the logistics of satellite launch, possible orbits and other aspects of the creation of a network of world-circling satellites, pointing to the benefits of high-speed global communications. He also suggested that three geostationary satellites would provide coverage over the entire planet.
Reference
2.The Brick Moon and Other Stories by Edward Everett Hale". Project Gutenberg. Retrieved on 2008-03-06.
-- Download This eBook for free.
--Content: The brick moon -- Crusoe in New York -- Bread on the waters -- The lost palace -- 99 Linwood Street -- Ideals -- Thanksgiving at the polls -- The survivor's story
3. Contents - The Atlantic monthly. Volume 24, Issue 141". cornell.edu. Retrieved on 2008-03-06.
--Contents from Cornell University Library
4.The_1945_Proposal_by_Arthur_C._Clarke_for_Geostationary_Satellite_Communications". lakdiva.org. Retrieved on 2008-03-06.
--Sir Arthur C. Clarke's most famous prediction on the future is his proposal of geostationary satellite communications published in the Wireless World magazine in 1945. Not considered seriously at the time it became a reality within 20 years with the launching on 1965 April 6th of Intelsat I Early Bird the first commercial geostationary communication satellite marking the true beginning of satellite tv.
A satellite in an equatorial circular orbit at a distance of approximately 42,164 km from the center of the Earth, i.e., approximately 35,787 km (22,237 miles) above mean sea level has a period equal to the Earth's rotation on its axis (Sidereal Day=23h56m) and would remain geostationary over the same point on the Earth's equator. In 2002 the Clarke Orbit had over 300 satellites.
The first reference to geostationary satellites is Clarke's letter to the editor titled Peacetime Uses for V2 published in the 1945 February issue of Wireless World (page 58).
Arthur Clarke in his Scientific Autobiography Ascent to Orbit published 1984 say that he had forgotten about this letter till he was reminded of it in 1968 by the engineering staff of the Sri Lanka Broadcasting Corporation.
--Content: This Book
No comments:
Post a Comment