Package 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, 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
CR3BPMultipleShooter(List<SpacecraftState> initialGuessList, List<NumericalPropagator> propagatorList, List<STMEquations> stmEquations, 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.
protected int	getNumberOfConstraints()	Get the total number of constraints.
void	setClosedOrbitConstraint(boolean isClosed)	Set the constraint of a closed orbit or not.
void	setEpochFreedom(int patchIndex, boolean isFree)	Set the epoch of a patch point to free or not.
void	setScaleLength(double scaleLength)	Set the scale length.
void	setScaleTime(double scaleTime)	Set the scale time.

Methods inherited from class org.orekit.utils.AbstractMultipleShooting

addConstraint, compute, computeEpochJacobianMatrix, getConstraintsMap, getFreeCompsMap, getNumberOfFreeComponents, getPatchedSpacecraftState, getPatchPoint, setPatchPointComponentFreedom, updateAdditionalConstraints

Methods inherited from class java.lang.Object

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

Constructor Details

CR3BPMultipleShooter

public CR3BPMultipleShooter(List<SpacecraftState> initialGuessList,
 List<NumericalPropagator> propagatorList,
 List<STMEquations> stmEquations,
 double tolerance,
 int maxIter)

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

stmEquations - 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.

setEpochFreedom

public void setEpochFreedom(int patchIndex,
 boolean isFree)

Set the epoch of a patch point to free or not.

Overrides:

setEpochFreedom in class AbstractMultipleShooting

Parameters:

patchIndex - Patch point index (zero-based)

isFree - constraint value

setScaleLength

public void setScaleLength(double scaleLength)

Set the scale length.

Overrides:

setScaleLength in class AbstractMultipleShooting

Parameters:

scaleLength - scale length in meters

setScaleTime

public void setScaleTime(double scaleTime)

Set the scale time.

Overrides:

setScaleTime in class AbstractMultipleShooting

Parameters:

scaleTime - scale time in seconds

setClosedOrbitConstraint

public void setClosedOrbitConstraint(boolean isClosed)

Set the constraint of a closed orbit or not.

Parameters:

isClosed - true if orbit should be closed

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

getNumberOfConstraints

protected int getNumberOfConstraints()

Get the total number of constraints.

Overrides:

getNumberOfConstraints in class AbstractMultipleShooting

Returns:

the total number of constraints