On the propagation and control of geosynchronous orbits

The GEOSYN computer program for the mission design and analysis of geosynchronous orbits is composed of an efficient propagation in the mean equinoctial elements, with the ability to recover osculating elements, and algorithms for the independent control of the ascending node longitude, inclination, and argument of perigee, within specified limits. The semianalytical theory of orbit perturbations and maneuvers, used to determine the long range effect of stationkeeping maneuvers, is found to be cost-effective in terms of computer resources. For a 2000-day integration, computer time with a CDC 7600 computer was 3.5 sec.