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Foundation ::
Trajectories and Orbital Mechanics ::
EIVAN
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EIVAN
An Interactive Orbital Trajectory Planning Tool
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Moderators:
Adopt This Application!
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SOURCE CODE AVAILABLE
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The Interactive Orbital Trajectory planning Tool, EIVAN, is a forward
looking interactive orbit trajectory plotting tool for use with Proximity
Operations (operations occurring within a one kilometer sphere of the space
station) and other maneuvers.
The result of vehicle burns on-orbit is very
difficult to anticipate because of non-linearities in the equations of motion
governing orbiting bodies. EIVAN was developed to plot resulting trajectories,
to provide a better comprehension of orbital mechanics effects,
and to help the user develop heuristics for on orbit mission planning.
EIVAN comprises a worksheet and a chart from Microsoft Excel on a Macintosh computer. The orbital path for a user-specified time interval is
plotted given operator burn inputs. Fuel use is also calculated. After the
thrust parameters (magnitude, direction, and time) are input, EIVAN plots
the resulting trajectory. Up to five burns may be inserted at any time in
the mission. Twenty data points are plotted for each burn and the time interval can be varied to accommodate any desired time frame or degree of resolution.
Since the number of data points for each burn is constant, the mission
duration can be increased or decreased by increasing or decreasing the
time interval.
EIVAN carries the NASA case number ARC-12365. It was originally released as part of the NASA COSMIC collection.
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