Advances in space science and technology. Volume 5 by Frederick I. Ordway PDF

By Frederick I. Ordway

ISBN-10: 1483199630

ISBN-13: 9781483199634

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Work is progressing on these standards but has not yet reached the point of formal adoption. I t is not possible, at this time, to make a statement as to the limitation which echo and time delay places on satellite height. There is some indication that it will be necessary to limit the time delay to about one-third of a second (350 msec). If this becomes the internationally accepted value, it will mean that the synchronous satellite system will be limited to a single-hop telephone traffic and that the long distance transmission will be carried over several hops by a lower altitude system.

A part of this energy is picked up by receiving stations. The system has the advantage of great satellite simplicity but extremely high transmitter powers and very large satellites are required if an ap­ preciable bandwidth is to be handled. For example, using 85-ft diameter antennas at the terminals, a 10-kw transmitter can handle two telephone channels (or equivalent) with a 100-ft diameter satellite. Bandwidth COMMUNICATION RELAY SATELLITE TECHNIQUES 29 could be increased by increasing the size of the antenna, the size of the satellite, or the transmitter power level; but it appears that it would not be possible to provide a system capable of equaling the quality of the submarine cable except at many times the cost of the cable.

Therefore, the subject of solid fuel rockets in space applications will be deferred until after a discussion of technology that goes into the motors and propellants. II. Factors Affecting Propellant Performance A. Composition The factors considered important in the ballistic performance of solid propellants are burning rate, specific impulse, volume impulse, pressure exponent, and temperature coefficient of burning rate. All depend on the composition. Composition is to be understood as meaning both the type of material and the weight per cent of ingredients (Table I ) .

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Advances in space science and technology. Volume 5 by Frederick I. Ordway


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