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<h2>AAS 97-690</h2>
<h2> HYBRID EPHEMERIS COMPRESSION MODEL </h2>
<h4> F.R. Hoots, R.G. France - GRC International, Inc. </h4>
<h2> Abstract </h2>
A new approach has been taken to developing an ephemeris compression model. The model uses the two body and J2 solution as a basis and overlays Fourier series to model the small differences between the analytic solution and the more accurate numerical reference. The ephemeris compression model runs faster than currently used GP models, accurately imitates the SP reference within a few hundred meters for several days, is valid for all eccentricities and inclinations, and requires transmission of less than 50 coefficients.