This report describes a method of producing accurate pointing information for steerable antennas by utilizing local satellite position predictions and a small on-site digital computer. The local Cartesian coordinates of the satellite are generated at Goddard Space Flight Center's Computing Center and transmitted by teletype to the various antenna sites. The on-site computer performs an interpolation and coordinate transformation of these coordinates, incorporates various environmental considerations, and produces a drive tape for input to the antenna directing device. This system preserves completely the accuracy of the predictions generated at the Goddard Computing Center and performs the desired operations in 0.5 real time or less.
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