Package org.orekit.utils

Class MultipleShooter

java.lang.Object

org.orekit.utils.AbstractMultipleShooting

org.orekit.utils.MultipleShooter

All Implemented Interfaces:

MultipleShooting

public class MultipleShooter
extends AbstractMultipleShooting

Multiple shooting method applicable for trajectories, in an ephemeris model. Not suited for closed orbits.

Since:

10.2

Author:

William Desprats, Alberto Fossà

See Also:

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

Constructor Summary

Constructors

Constructor	Description
MultipleShooter(List<SpacecraftState> initialGuessList, List<NumericalPropagator> propagatorList, List<EpochDerivativesEquations> epochEquations, double tolerance, int maxIter)	Simple Constructor.

Method Summary

Modifier and Type	Method	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 SpacecraftState	getAugmentedInitialState(int i)	Compute the additional state from the additionalEquations.

Methods inherited from class org.orekit.utils.AbstractMultipleShooting

addConstraint, compute, computeEpochJacobianMatrix, getConstraintsMap, getFreeCompsMap, getNumberOfConstraints, getNumberOfFreeComponents, getPatchedSpacecraftState, getPatchPoint, setEpochFreedom, setPatchPointComponentFreedom, setScaleLength, setScaleTime, updateAdditionalConstraints

Methods inherited from class java.lang.Object

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

Constructor Details

MultipleShooter

public MultipleShooter(List<SpacecraftState> initialGuessList,
 List<NumericalPropagator> propagatorList,
 List<EpochDerivativesEquations> epochEquations,
 double tolerance,
 int maxIter)

Simple Constructor.

Standard constructor for multiple shooting which can be used with non-autonomous systems.

Parameters:

initialGuessList - initial patch points to be corrected

propagatorList - list of propagators associated to each patch point

epochEquations - list of additional derivatives providers linked to propagatorList

tolerance - convergence tolerance on the constraint vector

maxIter - maximum number of iterations

Method Details

getAugmentedInitialState

protected SpacecraftState getAugmentedInitialState(int i)

Compute the additional state from the additionalEquations.

Specified by:

getAugmentedInitialState in class AbstractMultipleShooting

Parameters:

i - index of the state

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

computeAdditionalConstraints

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

Compute the additional constraints.

Specified by:

computeAdditionalConstraints in class AbstractMultipleShooting

Parameters:

propagatedSP - propagated SpacecraftState

Returns:

fxAdditional additional constraints