Description
The SpacecraftCovariance object represents the covariance associated with a Spacecraft. The size of the covariance matrix itself is equivalent to the total number of Spacecraft state elements being estimated or considered. Note that the Spacecraft covariance can be propagated without being included in an Orbit Determination process.
Users cannot create instances of this type of object. However, users can access instances of this object type that have been created indirectly, for example as children of other objects. Users can also access any static properties and methods on this object type.
Inheritance Hierarchy: ObjectàSpacecraftCovariance
Available In Editions:
Engineer
Mission
Timing Precision Mode
This page describes functionality in nanosecond timing precision mode.
Name
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Description
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CorrelationMatrix
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The correlation matrix. Derived from the covariance matrix.
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DeclaredName
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The name of the object as declared.
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Diagonal
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An array containing the elements of the diagonal (e.g. the Variances) of the Covariance matrix. The dimension of the array will equal the Number of Rows for the Covariance.
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DisplayName
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The name displayed for this object in output windows such as views, plots, and reports.
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Matrix
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The covariance matrix in the MJ2000 equatorial frame associated with all properties to be estimated. Symmetry of the covariance matrix is enforced when setting elements of this matrix.
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NumberOfRows
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The number of rows in the Covariance matrix.
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ObjectId
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The unique identifier for the object.
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ObjectType
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The type of the object.
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SmoothedDiagonal
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An array containing the elements of the diagonal (e.g. the Variances) of the Smoothed Covariance matrix. The dimension of the array will equal the Number of Rows for the Covariance.
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SmoothedMatrix
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The smoothed covariance matrix.
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SquareRootInformationMatrix
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The cholesky decomposition of the inverse of the covariance matrix.
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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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GetOrbitStateCovarianceInElementSet
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Returns the covariance of the orbit state in the specified element set.
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MapErrorEllipsoid
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Determines the orientation and size of the Error Ellipsoid by calculating the Eigenvalues and Eigenvectors of the 3x3 position Covariance.
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MapSmoothedErrorEllipsoid
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Determines the orientation and size of the Error Ellipsoid by calculating the Eigenvalues and Eigenvectors of the Smoothed 3x3 position Covariance.
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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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Name
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Description
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GetElement
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Returns the value of the specified Covariance matrix element.
This method has been Deprecated. Please use Covariance.Matrix() instead, using indices to access elements of the matrix.
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GetSmoothedElement
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Returns the Smoothed value of the specified Covariance matrix element.
This method has been Deprecated. Please use Covariance.SmoothedMatrix() instead, using indices to access elements of the matrix.
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SetElement
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Sets the value of an element of the Covariance matrix.
This method has been Deprecated. Please use Covariance.Matrix() instead, using indices to access elements of the matrix.
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See also
Orbit Determination Guide
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