org.orekit.propagation.numerical.cr3bp

Class CR3BPMultipleShooter

java.lang.Object

org.orekit.utils.AbstractMultipleShooting

org.orekit.propagation.numerical.cr3bp.CR3BPMultipleShooter

All Implemented Interfaces:

MultipleShooting

public class CR3BPMultipleShooter
extends AbstractMultipleShooting

Multiple shooting method applicable for orbits, either propagation in CR3BP, or in an ephemeris model.

Author:

William Desprats

See Also:

"TRAJECTORY DESIGN AND ORBIT MAINTENANCE STRATEGIES IN MULTI-BODY DYNAMICAL REGIMES by Thomas A. Pavlak, Purdue University"

Constructor Summary

Constructors

Constructor and Description
CR3BPMultipleShooter(List<SpacecraftState> initialGuessList, List<NumericalPropagator> propagatorList, List<AdditionalEquations> additionalEquations, double arcDuration, double tolerance) Simple Constructor.

Method Summary

Modifier and Type	Method and Description
protected double[]	computeAdditionalConstraints(List<SpacecraftState> propagatedSP) Compute the additional constraints.
protected double[][]	computeAdditionalJacobianMatrix(List<SpacecraftState> propagatedSP) Compute a part of the Jacobian matrix from additional constraints.
protected double[][]	computeEpochJacobianMatrix(List<SpacecraftState> propagatedSP) Compute a part of the Jacobian matrix with derivatives from epoch.
protected SpacecraftState	getAugmentedInitialState(SpacecraftState initialState, AdditionalEquations additionalEquation) Compute the additional state from the additionalEquations.

Methods inherited from class org.orekit.utils.AbstractMultipleShooting

addConstraint, compute, getConstraintsMap, getFreeEpochMap, getFreePatchPointMap, getNumberOfConstraints, getNumberOfFreeEpoch, getNumberOfFreeVariables, getPatchedSpacecraftState, getPropagatorList, isClosedOrbit, setClosedOrbitConstraint, setEpochFreedom, setPatchPointComponentFreedom, updateAdditionalConstraints

Methods inherited from class java.lang.Object

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

Constructor Detail

CR3BPMultipleShooter

public CR3BPMultipleShooter(List<SpacecraftState> initialGuessList,
                            List<NumericalPropagator> propagatorList,
                            List<AdditionalEquations> additionalEquations,
                            double arcDuration,
                            double tolerance)

Simple Constructor.

Standard constructor for multiple shooting which can be used with the CR3BP model.

Parameters:

initialGuessList - initial patch points to be corrected.

propagatorList - list of propagators associated to each patch point.

additionalEquations - list of additional equations linked to propagatorList.

arcDuration - initial guess of the duration of each arc.

tolerance - convergence tolerance on the constraint vector

Method Detail

getAugmentedInitialState

protected SpacecraftState getAugmentedInitialState(SpacecraftState initialState,
                                                   AdditionalEquations additionalEquation)

Compute the additional state from the additionalEquations.

Specified by:

getAugmentedInitialState in class AbstractMultipleShooting

Parameters:

initialState - SpacecraftState without the additional state

additionalEquation - Additional Equations.

Returns:

augmentedSP SpacecraftState with the additional state within.

computeAdditionalJacobianMatrix

protected double[][] computeAdditionalJacobianMatrix(List<SpacecraftState> propagatedSP)

Compute a part of the Jacobian matrix from additional constraints.

Specified by:

computeAdditionalJacobianMatrix in class AbstractMultipleShooting

Parameters:

propagatedSP - propagatedSP

Returns:

jacobianMatrix Jacobian sub-matrix

computeEpochJacobianMatrix

protected double[][] computeEpochJacobianMatrix(List<SpacecraftState> propagatedSP)

Compute a part of the Jacobian matrix with derivatives from epoch. The CR3BP is a time invariant problem. The derivatives w.r.t. epoch are zero.

Overrides:

computeEpochJacobianMatrix in class AbstractMultipleShooting

Parameters:

propagatedSP - propagatedSP

Returns:

jacobianMatrix Jacobian sub-matrix

computeAdditionalConstraints

protected double[] computeAdditionalConstraints(List<SpacecraftState> propagatedSP)

Compute the additional constraints.

Specified by:

computeAdditionalConstraints in class AbstractMultipleShooting

Parameters:

propagatedSP - propagated SpacecraftState

Returns:

fxAdditionnal additional constraints