Statistics – Computation
Scientific paper
Jun 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977usoc....2.....m&link_type=abstract
Unified System for Orbit Computation (USOC). Volume 2: Orbits in the solar system
Statistics
Computation
Orbit Calculation, Planetary Orbits, Solar Orbits, Spacecraft Orbits, Boundary Value Problems, Computer Programming, Documentation, Modules, Predictions, Subroutine Libraries (Computers)
Scientific paper
The Unified System for Orbit Computation (USOC), see N77-17120, was extended to allow an arbitrary planet or the sun to be the central body of a spacecraft's orbit. Single step integration and the multirevolution orbit prediction method were made available to the system. The Kustaanheimo-Stiefel uniformly regular elements and the Poincare-similar elements were made available for numerical integration. Orbit generation and auxiliary calculations can be run separately. The preprocessor was updated and split into subroutines. The new options were implemented by adding new versions of library modules representing existing kinds of functional modules to the subroutine library. The implemented standard options allow the solution of initial value problems for planets and the sun as central body. Applying the features of phasing and iteration by cycling makes the system extendable to interplanetary boundary value problem capabilities.
Maag W.
Starke S. E.
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