Package org.orekit.control.indirect.adjoint

Class FieldCartesianAdjointDerivativesProvider<T extends CalculusFieldElement<T>>

java.lang.Object

org.orekit.control.indirect.adjoint.FieldCartesianAdjointDerivativesProvider<T>

Type Parameters:

T - type of the field elements

All Implemented Interfaces:

FieldAdditionalDerivativesProvider<T>

public class FieldCartesianAdjointDerivativesProvider<T extends CalculusFieldElement<T>>
extends Object
implements FieldAdditionalDerivativesProvider<T>

Class defining the Field version of the adjoint dynamics for Cartesian coordinates, as defined in the Pontryagin Maximum Principle.

Since:

12.2

Author:

Romain Serra

See Also:

• FieldAdditionalDerivativesProvider
• FieldNumericalPropagator
• CartesianAdjointDerivativesProvider

Constructor Summary

Constructors

Constructor	Description
FieldCartesianAdjointDerivativesProvider(FieldCartesianCost<T> cost, CartesianAdjointEquationTerm... adjointEquationTerms)	Constructor.

Method Summary

Modifier and Type	Method	Description
FieldCombinedDerivatives<T>	combinedDerivatives(FieldSpacecraftState<T> state)	Compute the derivatives related to the additional state (and optionally main state increments).
T	evaluateHamiltonian(FieldSpacecraftState<T> state)	Evaluate the Hamiltonian from Pontryagin's Maximum Principle.
FieldCartesianCost<T>	getCost()	Getter for the cost.
int	getDimension()	Getter for the dimension.
String	getName()	Getter for the name.
void	init(FieldSpacecraftState<T> initialState, FieldAbsoluteDate<T> target)	Initialize the generator at the start of propagation.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.orekit.propagation.integration.FieldAdditionalDerivativesProvider

yields

Constructor Details

FieldCartesianAdjointDerivativesProvider

public FieldCartesianAdjointDerivativesProvider(FieldCartesianCost<T> cost,
 CartesianAdjointEquationTerm... adjointEquationTerms)

Constructor.

Parameters:

cost - cost function

adjointEquationTerms - terms contributing to the adjoint equations

Method Details

getCost

public FieldCartesianCost<T> getCost()

Getter for the cost.

Returns:

cost

getName

public String getName()

Getter for the name.

Specified by:

getName in interface FieldAdditionalDerivativesProvider<T extends CalculusFieldElement<T>>

Returns:

name

getDimension

public int getDimension()

Getter for the dimension.

Specified by:

getDimension in interface FieldAdditionalDerivativesProvider<T extends CalculusFieldElement<T>>

Returns:

dimension

init

public void init(FieldSpacecraftState<T> initialState,
 FieldAbsoluteDate<T> target)

Initialize the generator at the start of propagation.

Specified by:

init in interface FieldAdditionalDerivativesProvider<T extends CalculusFieldElement<T>>

Parameters:

initialState - initial state information at the start of propagation

target - date of propagation

combinedDerivatives

public FieldCombinedDerivatives<T> combinedDerivatives(FieldSpacecraftState<T> state)

Compute the derivatives related to the additional state (and optionally main state increments).

Specified by:

combinedDerivatives in interface FieldAdditionalDerivativesProvider<T extends CalculusFieldElement<T>>

Parameters:

state - current state information: date, kinematics, attitude, and additional states this equations depend on (according to the yields method)

Returns:

computed combined derivatives, which may include some incremental coupling effect to add to main state derivatives

evaluateHamiltonian

public T evaluateHamiltonian(FieldSpacecraftState<T> state)

Evaluate the Hamiltonian from Pontryagin's Maximum Principle.

Parameters:

state - state assumed to hold the adjoint variables

Returns:

Hamiltonian