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

By Frederick I. Ordway

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The term "station keeping" is used to designate satellites which main­ tain a specified position, either with respect to other satellites, or with respect to a point on the Earth's surface, as is necessary for stationary satellites. Such station keeping demands reasonably close control of the altitude of the satellite and the inclination of its orbit, and extremely close control of its velocity. This control is obtained by adjusting the velocity of the satellite by a small rocket motor. This, in turn, requires an attitude control system to insure that the thrust of the motor is in the required direction.

C. Brown, R. , and Lovell, A. B. " Chapman & Hall, London, 1957. L. J. " Academic Press, New York, 1962. Convention Record, 5th Natl. Symposium on Global Communications, Chicago (available from C. F. Wittkop, 1450 N. Cicero Avenue, Chicago, Illinois). Space Electronics Issue, Proc. E. 48, 4 (1960). Pierce, J. , and Cutler, C. C , Interplanetary communications. Advances in Space Sci. 1, 55-109 (1959). T. about the influence of propagation times and of echo ef- 46 14. 15. 16. 17. 18. 19. 20. 21. 22.

These are currently distributed by teletype to radio stations, airports, and newspapers, which then transmit the material to the end user. At the present time the major effort in communication satellites re­ lates to the relay or point-to-point service. The remainder of this chapter is devoted entirely to this service and will discuss the reasons why the service is attractive, the techniques which may be used, and selected specific system proposals which have been made. II. The Need for Long Range Communication [5, 6] At the present time various points around the world are intercon­ nected by a variety of communication techniques.

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