By Frederick I. Ordway
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Extra info for Advances in space science and technology. Volume 5
Therefore, for telegraph traffic it is desirable that the change in time delay be zero. This is most easily satisfied by the stationary synchronous orbit, which does not require switching. I t may be satisfied by other systems if the switching is ar810 3 HOPS 19,316 N. Ml. MI. MI. MI. I0 DISTANCE BETWEEN 6ROUN0 TERMINALS 7 FIG. 9. Time delay—multiple h o p ; relaying. ranged so that the time delay is identical at the instant of switching. This is relatively easy for the equatorial orbit but becomes more difficult for the polar orbit.
General conclu sions are then drawn. Over a given route the two most important factors are the latitude of the route midpoint, which gives the location of the mutual coverage zone; and the size of this zone, which is determined by route length and satellite height. For example , consider the route from Newfoundland to the Heb rides in the British Isles, with the satellite in a 3000-nautical-mile polar orbit. For this route the mutual coverage zone encloses the pole so that a polar orbit satellite will give some service on each pass.
The passive stabilization system depends on the fact that the gravita tional attraction of the Earth decreases with altitude. If the satellite is symmetrical about an axis of rotation, then the part which is closest to the Earth will be attracted most strongly. The satellite consequently will try to align itself to the vertical, thus maintaining the same face towards the Earth just as does the Moon. While attractive in principle, the sysFILL AND VENT ATTITUDE SENSOR „ PNEUMATIC $ MANIFOLD VALVE STORED COLO H2 REGULATOR DATA PROCESSING ATTITUDE CONTROL AMPLIFIER c NOZZLE MOMENTUM PACKAGE FIG.