A program to compute the coordinates of a geostationary satellite for time and frequency broadcast

A Fortran program for computing the position coordinates of a geostationary satellite is described. The program, which runs on a PC-XT, requires as input data the six standard orbital elements at a specified epoch. The perturbations to the satellite orbit due to solar and lunar attractions, the nonspherical part of the Earth's gravitational potential, and solar radiation pressure are considered. The approach is to treat the satellite orbit as a Keplerian ellipse but with time-varying orbital parameters. Extensive comparisons are made between computations and the data of INSAT broadcast at the National Physical Laboratory in New Delhi, India (NPL).<
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