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Foundation ::
Trajectories and Orbital Mechanics ::
ASAP
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ASAP
Artificial Satellite Analysis Program
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Moderators:
Adopt This Application!
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SOURCE CODE AVAILABLE
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The Artificial Satellite Analysis Program (ASAP) is a general orbit
prediction program which incorporates sufficient orbit modeling accuracy
for mission design, maneuver analysis, and mission planning.
ASAP is suitable
for studying planetary orbit missions with spacecraft trajectories of
exploratory (mapping) nature. Sample data is
included for a geosynchronous station drift cycle study, a Venus radar mapping
strategy, a frozen orbit about Mars, and a repeat ground trace orbit.
ASAP uses Cowell's method in the numerical integration of the equations
of motion. The orbital mechanics calculation contains perturbations
due to non-sphericity (up to a 40 X 40 field) of the planet, lunar and solar
effects, and drag and solar radiation pressure. An 8th order RungeKutta
integration scheme with variable step size control is used for efficient
propagation. The input includes the classical osculating elements,
orbital elements of the sun relative to the planet, reference time
and dates, drag coefficient, gravitational constants, and planet radius,
rotation rate, etc.
The printed output contains Cartesian coordinates, velocity,
equinoctial elements, and classical elements for each time step
or event step. At each step, selected output is added to a plot file.
The
ASAP package includes a program for sorting this plot file. LOTUS 1-2-3 is
used in the supplied examples to graph the results, but any graphics software
package could be used to process the plot file. ASAP is not written to
be mission-specific. Instead, it is intended to be used for most planetary
orbiting missions. As a consequence, the user has to have some basic understanding
of orbital mechanics to provide the correct input and interpret
the subsequent output.
ASAP carries the NASA Case Number NPO-17522. It was originally released as part of the NASA COSMIC collection.
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