Description
The Two Body propagator is a simple orbit propagator which assumes unperturbed central force motion. See expanded description.
Two Body generates simple Keplerian motion (i.e. two-body motion with no perturbing forces). It produces Keplerian motion around the Earth. This propagator is the fastest but least accurate of those available in the FreeFlyer. The performance of this propagator provides benefits to performing early mission concept development or in visualization when only modest accuracy requirements are needed. Force model settings are ignored for the Two Body propagator.
Note: The Two Body propagator propagates a Keplerian state. All other propagators integrate the ICRF Cartesian state.
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Inheritance Hierarchy: Object->Propagator->TwoBody
Available In Editions:
Engineer
Mission
Timing Precision Mode
This page describes functionality in millisecond timing precision mode. Millisecond timing precision mode is deprecated and will be removed in a future release. We recommend that you migrate your Mission Plans to nanosecond timing precision mode.
Click here to see the documentation for this object in nanosecond timing precision mode.
Signatures
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Description
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TwoBody()
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Creates a default TwoBody object.
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TwoBody(ForceModel forceModel)
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Create a propagator with the specified ForceModel. Note: On analytical propagators the ForceModel is not used. In this situation, the default constructor with no arguments should be used.
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Name
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Description
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Attributes
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DeclaredName
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The name of the object as declared.
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Type: String
Access: Read-Only
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Name
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The name displayed for this object in output windows such as views, plots, and reports.
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Type: String
Access: Read/Write
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ObjectId
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The unique identifier for the object.
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Type: Variable
Access: Read-Only
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ObjectType
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The type of the object.
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Type: String
Access: Read-Only
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StepSize
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The number of seconds the propagated object is advanced when the Step command is executed.
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Type: Variable
Access: Read/Write
Units: s
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Name
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Description
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ClearSavedStates
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Clears previous saved states for this object.
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GetFromFile
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Load the object state from the specified FreeFlyer object file.
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GetFromString
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Load the object state from the specified string.
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PutToFile
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Convert the object state to FreeFlyer object xml and write to a file.
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PutToString
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Convert the object state to FreeFlyer object xml and return as a string.
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ReferenceEquals
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Returns 1 if the argument refers to the calling object and 0 otherwise.
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Restore
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Restore an object's state from a previously saved state.
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Save
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Save the object's state so that it can be restored later.
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See also
Spacecraft Propagators
Setting up an Integrator
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