fr.cnes.sirius.patrius.stela.forces.gravity
Class StelaTesseralAttraction

java.lang.Object
  fr.cnes.sirius.patrius.stela.forces.AbstractStelaLagrangeContribution
      fr.cnes.sirius.patrius.stela.forces.gravity.StelaTesseralAttraction

All Implemented Interfaces:

StelaForceModel

public final class StelaTesseralAttraction
extends AbstractStelaLagrangeContribution

This class represent the tesseral perturbations

Since:

1.3

Version:

$Id: StelaTesseralAttraction.java 12501 2015-03-05 15:47:35Z bignon $

Author:

Rami Houdroge

Concurrency :

not thread-safe

Concurrency comment :

not thread-safe due to use of mutable attributes

Field Summary

Fields inherited from class fr.cnes.sirius.patrius.stela.forces.AbstractStelaLagrangeContribution

dPot

Constructor Summary

StelaTesseralAttraction(PotentialCoefficientsProvider provider)
Constructor.

StelaTesseralAttraction(PotentialCoefficientsProvider provider, int tesseralOrder, int qMax, double step, int nStep)
Constructor.

Method Summary

double[][]	computePartialDerivatives(StelaEquinoctialOrbit orbit) Compute the partial derivatives for a given spacecraft state.
double[]	computePerturbation(StelaEquinoctialOrbit orbit) Compute the dE/dt force derivatives for a given spacecraft state.
double[]	computeShortPeriods(StelaEquinoctialOrbit orbit) Compute the short periodic variations for a given spacecraft state.
List<TesseralQuad>	getQuadsList() Getter for the quad list.
void	updateQuads(Orbit orbit) Compute quads (n, m, p, q).

Methods inherited from class fr.cnes.sirius.patrius.stela.forces.AbstractStelaLagrangeContribution

getdPot, getType

Methods inherited from class java.lang.Object

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

Constructor Detail

StelaTesseralAttraction

public StelaTesseralAttraction(PotentialCoefficientsProvider provider)

Constructor.

Parameters:

provider - potential coefficients provider

StelaTesseralAttraction

public StelaTesseralAttraction(PotentialCoefficientsProvider provider,
                               int tesseralOrder,
                               int qMax,
                               double step,
                               int nStep)

Constructor.

Parameters:

provider - potential coefficients provider

tesseralOrder - the max order in the Kaula developpement

qMax - the maximum value of Q in the Kaula formulation

step - integration step

nStep - number of integration step

Method Detail

computePerturbation

public double[] computePerturbation(StelaEquinoctialOrbit orbit)
                             throws OrekitException

Compute the dE/dt force derivatives for a given spacecraft state.

Specified by:

computePerturbation in class AbstractStelaLagrangeContribution

Parameters:

orbit - current orbit information: date, kinematics

Returns:

the perturbation dE/dt for the current force

Throws:

OrekitException - if perturbation computation fails

updateQuads

public void updateQuads(Orbit orbit)

Compute quads (n, m, p, q).

Parameters:

orbit - orbit

computeShortPeriods

public double[] computeShortPeriods(StelaEquinoctialOrbit orbit)
                             throws OrekitException

Compute the short periodic variations for a given spacecraft state.

Parameters:

orbit - current orbit information: date, kinematics

Returns:

the short periodic variations of the current force

Throws:

OrekitException - if short periods computation fails

computePartialDerivatives

public double[][] computePartialDerivatives(StelaEquinoctialOrbit orbit)
                                     throws OrekitException

Compute the partial derivatives for a given spacecraft state.

Parameters:

orbit - current orbit information: date, kinematics

Returns:

the partial derivatives of the current force

Throws:

OrekitException - if partial derivatives computation fails

getQuadsList

public List<TesseralQuad> getQuadsList()

Getter for the quad list.

Returns:

the quadsList