Computer Science
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984stin...8528901g&link_type=abstract
Presented at the 25th COSPAR Meeting, 5 Jul. 1984, Graz, Austria
Computer Science
Computer Programs, Least Squares Method, Moon, Orbit Perturbation, Satellite Orbits, Accuracy, Constraints, Fortran, Numerical Integration, Satellite Drag
Scientific paper
This Paper traces the development, at the Royal Aircraft Establishment, of computer programs for orbit determination and orbit evolution. The principal program, PROP, is still in regular use, having an accuracy of 50 to 100 m for the orbits of close satellites determined over a period of a few days even when the drag is severe. The chief limitation of PROP is the absence of lunisolar perturbations, but these are included in a companion program, PROD, for the evolution of mean elements. Work of recent years has focused on a framework for far more accurate representation and generation of orbits. The method is purely analytical (as in PROP) for short-period perturbations, applied compactly via the use of a special system of spherical coordinates, but employs a degree of numerical integration in the variation of mean elements. The goal is single program that would eventually supersede the the PROP-PROD combination, providing an accuracy of perhaps 1 m.
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