Package org.orekit.utils

Class DerivativeStateUtils

java.lang.Object

org.orekit.utils.DerivativeStateUtils

public class DerivativeStateUtils
extends Object

Utility class used to convert state vectors in Taylor differential algebra.

Since:

13.1

Author:

Romain Serra

See Also:

• Gradient

Method Summary

Modifier and Type	Method	Description
static FieldAbsolutePVCoordinates<Gradient>	buildAbsolutePVGradient(GradientField field, AbsolutePVCoordinates coordinates)	Method creating a Gradient version of the input coordinates, using the state vector as the independent variables of a first- order Taylor algebra.
static FieldOrbit<Gradient>	buildOrbitGradient(GradientField field, Orbit orbit)	Method creating a Gradient version of the input orbit, using the state vector as the independent variables of a first- order Taylor algebra.
static FieldSpacecraftState<Gradient>	buildSpacecraftStateGradient(GradientField field, SpacecraftState state, AttitudeProvider attitudeProvider)	Method creating a Gradient version of the input state, using the state vector as the independent variables of a first- order Taylor algebra.
static FieldSpacecraftState<Gradient>	buildSpacecraftStateTransitionGradient(SpacecraftState state, RealMatrix partialDerivatives, AttitudeProvider attitudeProvider)	Method creating a Gradient version of the input state from a given transition matrix.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

buildSpacecraftStateTransitionGradient

public static FieldSpacecraftState<Gradient> buildSpacecraftStateTransitionGradient(SpacecraftState state,
 RealMatrix partialDerivatives,
 AttitudeProvider attitudeProvider)

Method creating a Gradient version of the input state from a given transition matrix. The number of independent variables equals the number of columns. The number of rows tells how many state variables are considered to be the dependent variables in the Taylor differential algebra. If the number of state variables is greater than 6, mass will be considered one. Additional data and derivatives are ignored.

Parameters:

state - full state

partialDerivatives - Jacobian matrix of state variables to consider as dependent ones, w.r.t. unknown parameters

attitudeProvider - provider to recompute attitude, can be null

Returns:

fielded state

See Also:

• FieldSpacecraftState
• SpacecraftState

buildSpacecraftStateGradient

public static FieldSpacecraftState<Gradient> buildSpacecraftStateGradient(GradientField field,
 SpacecraftState state,
 AttitudeProvider attitudeProvider)

Method creating a Gradient version of the input state, using the state vector as the independent variables of a first- order Taylor algebra. If the number of variables is greater than 6, mass will be considered one. Additional data and derivatives are ignored.

Parameters:

field - gradient field

state - full state

attitudeProvider - provider to recompute attitude, can be null

Returns:

fielded state

See Also:

• FieldSpacecraftState
• SpacecraftState

buildOrbitGradient

public static FieldOrbit<Gradient> buildOrbitGradient(GradientField field,
 Orbit orbit)

Method creating a Gradient version of the input orbit, using the state vector as the independent variables of a first- order Taylor algebra. If the number of variables is greater than 6, mass will be considered one.

Parameters:

field - gradient field

orbit - orbit

Returns:

fielded orbit

See Also:

• FieldOrbit
• Orbit

buildAbsolutePVGradient

public static FieldAbsolutePVCoordinates<Gradient> buildAbsolutePVGradient(GradientField field,
 AbsolutePVCoordinates coordinates)

Method creating a Gradient version of the input coordinates, using the state vector as the independent variables of a first- order Taylor algebra. If the number of variables is greater than 6, mass will be considered one.

Parameters:

field - gradient field

coordinates - absolute coordinates

Returns:

fielded coordinates

See Also:

• AbsolutePVCoordinates
• FieldAbsolutePVCoordinates