Accession Number : AD0428232


Title :   ON THE REQUIREMENTS FOR SYNCHRONOUS ORBITS,


Corporate Author : INSTITUTE FOR DEFENSE ANALYSES ARLINGTON VA


Personal Author(s) : Duke,Douglas


Report Date : Sep 1961


Pagination or Media Count : 9


Abstract : This note investigates certain problems associated with orbiting satellites in such a way that they pass over the same point on the earth at the same time each day. It is found that such orbits are possible and can be maintained for several months. It is also possible to choose the orbit so that the satellite spends a negligible fraction of its useful lifetime in the earth's shadow. Because of the specific applications contemplated, only altitudes from 250 to 1000 km are considered. The items of interest are the orbits themselves, their decay times, the injection accuracy required to achieve them, and (because of solar power considerations) the relative durations of shadow and sunlight in each orbit. (Author)


Descriptors :   *SYNCHRONOUS SATELLITES , EQUATORIAL ORBITS , SOLAR SYSTEM , EARTH(PLANET) , DRAG , WEIGHT , GRAVITY , VELOCITY , ERRORS , INJECTION GUIDANCE , SUN , MATHEMATICAL ANALYSIS , SATELLITE ATTITUDE , HIGH ALTITUDE , HIGH ORBIT TRAJECTORIES


Distribution Statement : APPROVED FOR PUBLIC RELEASE