Package org.orekit.propagation.semianalytical.dsst.forces

Interface J2SquaredModel

All Known Implementing Classes:

ZeisModel

public interface J2SquaredModel

Semi-analytical J2-squared model.

This interface is implemented by models providing J2-squared second-order terms in equinoctial elements. These terms are used in the computation of the closed-form J2-squared perturbation in semi-analytical satellite theory.

Since:

12.0

Author:

Bryan Cazabonne

See Also:

ZeisModel

Method Summary

Modifier and Type	Method	Description
double[]	computeMeanEquinoctialSecondOrderTerms(DSSTJ2SquaredClosedFormContext context)	Compute the J2-squared second-order terms in equinoctial elements.
<T extends CalculusFieldElement<T>> T[]	computeMeanEquinoctialSecondOrderTerms(FieldDSSTJ2SquaredClosedFormContext<T> context)	Compute the J2-squared second-order terms in equinoctial elements.
default List<ShortPeriodTerms>	initializeShortPeriodTerms(AuxiliaryElements auxiliaryElements, PropagationType type, double[] parameters)	Performs initialization of J2-squared short period terms prior to propagation.
default <T extends CalculusFieldElement<T>> List<FieldShortPeriodTerms<T>>	initializeShortPeriodTerms(FieldAuxiliaryElements<T> auxiliaryElements, PropagationType type, T[] parameters)	Performs initialization of J2-squared short period terms prior to propagation.
default void	updateShortPeriodTerms(double[] parameters, SpacecraftState... meanStates)	Update the J2-squared short period terms.
default <T extends CalculusFieldElement<T>> void	updateShortPeriodTerms(T[] parameters, FieldSpacecraftState<T>... meanStates)	Update the J2-squared short period terms.

Method Detail

computeMeanEquinoctialSecondOrderTerms

double[] computeMeanEquinoctialSecondOrderTerms(DSSTJ2SquaredClosedFormContext context)

Compute the J2-squared second-order terms in equinoctial elements.

Parameters:

context - model context

Returns:

the J2-squared second-order terms in equinoctial elements. Order must follow: [A, K, H, Q, P, M]

computeMeanEquinoctialSecondOrderTerms

<T extends CalculusFieldElement<T>> T[] computeMeanEquinoctialSecondOrderTerms(FieldDSSTJ2SquaredClosedFormContext<T> context)

Compute the J2-squared second-order terms in equinoctial elements.

Type Parameters:

T - type of the elements

Parameters:

context - model context

Returns:

the J2-squared second-order terms in equinoctial elements. Order must follow: [A, K, H, Q, P, M]

initializeShortPeriodTerms

default List<ShortPeriodTerms> initializeShortPeriodTerms(AuxiliaryElements auxiliaryElements,
                                                          PropagationType type,
                                                          double[] parameters)

Performs initialization of J2-squared short period terms prior to propagation.

Parameters:

auxiliaryElements - auxiliary elements

type - type of the elements used (MEAN or OSCULATING)

parameters - force model parameters

Returns:

a list containing the initialized short period terms

Since:

12.2

initializeShortPeriodTerms

default <T extends CalculusFieldElement<T>> List<FieldShortPeriodTerms<T>> initializeShortPeriodTerms(FieldAuxiliaryElements<T> auxiliaryElements,
                                                                                                      PropagationType type,
                                                                                                      T[] parameters)

Performs initialization of J2-squared short period terms prior to propagation.

Type Parameters:

T - type of the field elements

Parameters:

auxiliaryElements - auxiliary elements

type - type of the orbital elements used (MEAN or OSCULATING)

parameters - force model parameters

Returns:

a list containing the initialized short period terms

Since:

12.2

updateShortPeriodTerms

default void updateShortPeriodTerms(double[] parameters,
                                    SpacecraftState... meanStates)

Update the J2-squared short period terms.

The short period terms that will be updated are the ones that were returned during the call to initializeShortPeriodTerms(AuxiliaryElements, PropagationType, double[]).

Parameters:

parameters - force model parameters

meanStates - mean states information: date, kinematics, attitude

Since:

12.2

updateShortPeriodTerms

default <T extends CalculusFieldElement<T>> void updateShortPeriodTerms(T[] parameters,
                                                                        FieldSpacecraftState<T>... meanStates)

Update the J2-squared short period terms.

The short period terms that will be updated are the ones that were returned during the call to initializeShortPeriodTerms(AuxiliaryElements, PropagationType, double[]).

Type Parameters:

T - type of the field elements

Parameters:

parameters - force model parameters

meanStates - mean states information: date, kinematics, attitude

Since:

12.2