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 millisecond timing precision mode.
Name

Description

CorrelationMatrix

The correlation matrix. Derived from the covariance matrix.

DeclaredName

The name of the object as declared.

Diagonal

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.

Matrix

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.

Name

The name displayed for this object in output windows such as views, plots, and reports.

NumberOfRows

The number of rows in the Covariance matrix.

ObjectId

The unique identifier for the object.

ObjectType

The type of the object.

SmoothedDiagonal

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.

SmoothedMatrix

The smoothed covariance matrix.

SquareRootInformationMatrix

The cholesky decomposition of the inverse of the covariance matrix.


Name

Description

ClearSavedStates

Clears previous saved states for this object.

GetFromFile

Load the object state from the specified FreeFlyer object file.

GetFromString

Load the object state from the specified string.

GetOrbitStateCovarianceInElementSet

Returns the covariance of the orbit state in the specified element set.

MapErrorEllipsoid

Determines the orientation and size of the Error Ellipsoid by calculating the Eigenvalues and Eigenvectors of the 3x3 position Covariance.

MapSmoothedErrorEllipsoid

Determines the orientation and size of the Error Ellipsoid by calculating the Eigenvalues and Eigenvectors of the Smoothed 3x3 position Covariance.

PutToFile

Convert the object state to FreeFlyer object xml and write to a file.

PutToString

Convert the object state to FreeFlyer object xml and return as a string.

ReferenceEquals

Returns 1 if the argument refers to the calling object and 0 otherwise.

Restore

Restore an object's state from a previously saved state.

Save

Save the object's state so that it can be restored later.


Name

Description

Elements

A onedimensional array containing all the elements of the Covariance matrix.
This property has been Deprecated. Please use Covariance.Matrix instead, using indices to access elements of the matrix.

SmoothedElements

A onedimensional array containing all the elements of the Smoothed Covariance matrix.
This property has been Deprecated. Please use Covariance.SmoothedMatrix instead, using indices to access elements of the matrix.


Name

Description

GetElement

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.

GetSmoothedElement

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.

SetElement

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.


See also
Orbit Determination Guide
