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<title>AAS 98-189</title><body BGCOLOR="ffffff"> <h2>AAS 98-189</h2> <h2>MODELING CATASTROPHIC DECAY ORBITS THROUGH PERIGEE</h2> <h4>J. D. Fischer - USAF, Massachusetts Institute of Technology; P. J. Cefola, R. J. Proulx - C. S. Draper Laboratory</h4> <h2> Abstract </h2> As highly eccentric orbits decay, their passage through perigee acts as a major perturbation due to highly dynamic atmospheric effects. In order to better model decay, the authors will do a brief analysis of the modeling errors for various atmospheric effects. Using data from an upper stage SL-6 Molniya rocket body, the errors identified in these analyses will be used to define a functional representation of the process noise. The results of incorporating this function into a Kalman Filter are presented. <P><A HREF="http://www.space-flight.org/AAS_meetings/1998_winter/sessions.html">Back</A>