org.orekit.propagation.semianalytical.dsst.forces

Class DSSTCentralBody

java.lang.Object

org.orekit.propagation.semianalytical.dsst.forces.DSSTCentralBody

All Implemented Interfaces:

DSSTForceModel

public class DSSTCentralBody
extends Object
implements DSSTForceModel

Central body gravitational contribution to the DSSTPropagator.

Central body gravitational contribution is made of:

1. zonal harmonics contribution
2. tesseral harmonics contribution

Author:

Pascal Parraud

Constructor Summary

Constructors

Constructor and Description
DSSTCentralBody(Frame centralBodyFrame, double centralBodyRotationRate, UnnormalizedSphericalHarmonicsProvider provider) DSST Central body constructor.

Method Summary

Methods

Modifier and Type	Method and Description
EventDetector[]	getEventsDetectors() Get the discrete events related to the model.
double[]	getMeanElementRate(SpacecraftState spacecraftState) Computes the mean equinoctial elements rates dai / dt.
UnnormalizedSphericalHarmonicsProvider	getProvider() Get the spherical harmonics provider.
double[]	getShortPeriodicVariations(AbsoluteDate date, double[] meanElements) Computes the short periodic variations.
void	initialize(AuxiliaryElements aux) Performs initialization prior to propagation for the current force model.
void	initializeStep(AuxiliaryElements aux) Performs initialization at each integration step for the current force model.

Methods inherited from class java.lang.Object

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

Constructor Detail

DSSTCentralBody

public DSSTCentralBody(Frame centralBodyFrame,
               double centralBodyRotationRate,
               UnnormalizedSphericalHarmonicsProvider provider)

DSST Central body constructor.

Parameters:

centralBodyFrame - rotating body frame

centralBodyRotationRate - central body rotation rate (rad/s)

provider - provider for spherical harmonics

Method Detail

initialize

public void initialize(AuxiliaryElements aux)
                throws OrekitException

Performs initialization prior to propagation for the current force model.

This method aims at being called at the very beginning of a propagation.

Specified by:

initialize in interface DSSTForceModel

Parameters:

aux - auxiliary elements related to the current orbit

Throws:

OrekitException - if some specific error occurs

initializeStep

public void initializeStep(AuxiliaryElements aux)
                    throws OrekitException

Performs initialization at each integration step for the current force model.

This method aims at being called before mean elements rates computation.

Specified by:

initializeStep in interface DSSTForceModel

Parameters:

aux - auxiliary elements related to the current orbit

Throws:

OrekitException - if some specific error occurs

getMeanElementRate

public double[] getMeanElementRate(SpacecraftState spacecraftState)
                            throws OrekitException

Computes the mean equinoctial elements rates da_i / dt.

Specified by:

getMeanElementRate in interface DSSTForceModel

Parameters:

spacecraftState - current state information: date, kinematics, attitude

Returns:

the mean element rates dai/dt

Throws:

OrekitException - if some specific error occurs

getShortPeriodicVariations

public double[] getShortPeriodicVariations(AbsoluteDate date,
                                  double[] meanElements)
                                    throws OrekitException

Computes the short periodic variations.

Specified by:

getShortPeriodicVariations in interface DSSTForceModel

Parameters:

date - current date

meanElements - mean elements at current date

Returns:

the short periodic variations

Throws:

OrekitException - if some specific error occurs

getEventsDetectors

public EventDetector[] getEventsDetectors()

Get the discrete events related to the model.

Specified by:

getEventsDetectors in interface DSSTForceModel

Returns:

array of events detectors or null if the model is not related to any discrete events

getProvider

public UnnormalizedSphericalHarmonicsProvider getProvider()

Get the spherical harmonics provider.

Returns:

the spherical harmonics provider