Spelling suggestions: "subject:"artificial satellite""
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The introduction of new technology into telecommunications by competition or cooperation : the case of satellite communicationsChandler, Harry, 1948- January 1981 (has links)
No description available.
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The implications of the privatization of space telecommunications on international organizations /Bochinger, Steve. January 2000 (has links)
No description available.
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Relationships between member countries of a large international satellite telecommunications network, INTELSAT, 1964-1980Midvidy, David H. January 1984 (has links)
No description available.
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International cooperation in the private satellite communications sector : enhancing commercial exploitation of outer spaceBenguira, Audrey Shoshana January 2002 (has links)
No description available.
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Satellite placement using a partial space elevatorWoo, Pamela. January 2009 (has links)
No description available.
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The interpretation of satellite images and airphotos for reconnaissance groundwater exploration in coastal Peru /Gent, Malcolm Richard. January 1982 (has links)
No description available.
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In-orbit testing of satellite TWTA's without commercial traffic interferenceBeachem, Thomas Andrew 15 November 2013 (has links)
TWTAs (Traveling Xhuna Tube Amplifiers) are presently the primary life-limiting element of a communications satellite transponder. Satellite operators rely on spare ‘TWTAs to ensure that most of the transponders will be operating at the spacecraft end·of-life. We wish to track the °health° of the operating TWTAs in order to accurately predict the remaining useful lifetime of the satellite transponder. This information is very useful for system planning and risk assessment.
The primary failure mechanism of a TWTA is cathode deactivation, symptoms of which are measurable from an earth station. Present testing methods require the interruption of the communications traffic signal, which leads to a loss in revenue generated by the satellite. We present new methods to test TWTAs without significant interference to the communications signal. These methods include the use of test—tone signals and spread spectrum techniques. The test—tone method is readily implemented using commercially available hardware. The spread-spectrum technique requires customized hardware, and so is more expensive.
Finally, the data from these tests can be inserted into a transponder reliability model. The model is then used to predict the availability of the satellite transponder, up to and including the end-ef-life of the satellite. / Master of Science
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Direct evaluation of the earth's gravity anomaly field from orbital analysis of artificial earth satellites /Obenson, Gabriel Francis Tambe January 1970 (has links)
No description available.
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Feasibility Study of a New Approach to Resolve Radar Range Bin AmbiguityYee, Donald Shue 01 January 1972 (has links) (PDF)
This report describes the study of a new approach to resolve pulse radar range bin ambiguity problem. The nature and the cause of the problem are discussed, and various methods presently used to solve this problem are presented. The report points out the disadvantages of these methods and, thus, introduces a new approach to resolve the radar range bin ambiguity problem by examining the reasonableness of the trajectory of the object being traced. Necessary algorithm and computer programs to support the study are given in Appendices I, II, and III.
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A study of the range of validity for the method of Kryloff and Bogoliuboff as applied to a satellite in motion with a specified constant thrustJohnson, Richard Damon January 1963 (has links)
The solution to the problem of a satellite with a small constant thrust and under the influence of a central force field presents difficulties due to equations non-linearity. An investigation was made to determine what range of values of the thrust parameter could be utilized to obtain a valid approximate solution for the case of tangential thrusting.
The investigation was accomplished by developing programs for the 1620 High Speed Digital Computer, since the solution to the exact and approximate equations would otherwise be exceedingly laborious.
Under the assumption of no atmosphere, and neglecting the earth's oblateness, the study showed that the validity of the Kryloff and Bogoliuboff method was dependent on both the specific thrust aud the vehicle speed. For a Speed corresponding to an orbit of smaller eccentricity it was determined that the method of Kryloff and Bogoliuboff remained valid for larger values of W than when V was a velocity corresponding to an orbit with a greater eccentricity.
The method of Kryloff and Bogoliuboff represents a practical approach to the solution of satellite motion both from the aspect of ease of application and reasonable calculation times. / Master of Science
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