The Naval Space Command Automatic Differential Correction Process
Danielson, D. A.
Perini, Deborah N.
Schumacher, Paul W. Jr.
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The Naval Space Command maintains a database of orbital elements for the objects in the space catalog. This report is a documentation of the software which inputs new observations of a satellite and its old element set and outputs a new element set. Topics covered include: mathematics of batch least squares differential correction process, definition of fit span and passes, calculation of residuals and partials, inclusion of historical data, solution to normal equations, iterations and tolerances.
The Naval Space Command maintains a database of element sets for roughly 9,000 Earth-orbiting objects, which is essentially the U.S. Space Command satellite catalog. NAVSPACECOM receives about 270,000 observations per day and performs an average of 18,000 element set updates per day. About 98.5% of the element sets are updated, without human intervention, by computer software called AUTODC. The purpose of our report is to elucidate the technical aspects of AUTODC for the astrodynamics community.
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