Description
The SGP4 object provides access to the United States Space Force SGP4 propagation algorithm, included in FreeFlyer's installation package through the AstroStds library. The included DLL files are stored in the FreeFlyer installation directory under "Support Files\Engine\Third Party\64_Bit\AstroStdsSgp4Prop". This directory also includes a license file to enable users to access the open source SGP4 implementation. This library also supports the SGP4-XP algorithm, which is used with TLE data in ephemeris type 4 format and includes Solar Radiation Pressure modeling. See the Two-Line Element Set File page for more information.
Inheritance Hierarchy: Object->Propagator->SGP4
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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SGP4()
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Creates a default SGP4 object.
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SGP4(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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