<h2>AAS 95-430</h2><h2>Testing of Naval Space Command New Analytic Orbit Model</h2><h4>R. A. Glover, General Research Corp., Colorado Springs, CO, P. W. Schumacher, Jr., U.S. Naval Space Command, Dahlgren, VA</h4><h2> Abstract </h2>Presented is a summary of the testing of Naval Space Command's newly implemented PPT3 analytic orbit theory, which adds the SGP4 deep space modeling to the existing drag-modified Brouwer theory currently used to support NAVSPACECOM operations.  The test program isolates each model perturbation; the Brouwer zonal theory, the drag model, the lunar/solar gravitation, and the resonance effects for half-day and one-day periods, comparing each to similar controlled numerical integrations.  The full PPT3 theory is then compared to reference orbits generated by numerical integrations in a realistic, complex environment.
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