fr.cnes.sirius.patrius.stela.forces

Class AbstractStelaGaussContribution

java.lang.Object

fr.cnes.sirius.patrius.stela.forces.AbstractStelaGaussContribution

All Implemented Interfaces:

StelaForceModel, Serializable

Direct Known Subclasses:

NonInertialContribution, SRPSquaring, StelaAtmosphericDrag, StelaSRPSquaring

public abstract class AbstractStelaGaussContribution
extends Object
implements StelaForceModel

Abstract Class for the computation of Gauss Equations and its derivatives

Computation of Gauss Equations and its derivatives Gives "GAUSS" attributes

Since:

1.3

Version:

$Id$

Author:

Cedric Dental

See Also:

Serialized Form

Concurrency :

not thread-safe

Concurrency comment :

not thread-safe because two threads can simultaneously modify global attributes of the class

Field Summary

Fields

Modifier and Type	Field and Description
protected double[]	dPert Value of the perturbation derivative

Constructor Summary

Constructors

Constructor and Description
AbstractStelaGaussContribution() Constructor of the class

Method Summary

Modifier and Type	Method and Description
protected List<double[][]>	computeCoeffs(List<double[][][]> listQuadElements, int orderFS, int quadPoints, double meanMvt, double deltaAngle) Compute elements under integral for coefficients evaluation.
protected double[][][]	computeGaussDerivativeEquations(StelaEquinoctialOrbit orbit) Computation of the Gauss equation derivatives matrix in TNW frame.
protected double[][]	computeGaussEquations(StelaEquinoctialOrbit orbit) Compute the TNW Gauss Equation for GTO.
abstract double[]	computePerturbation(StelaEquinoctialOrbit orbit, OrbitNatureConverter converter) Compute the dE/dt force derivatives for a given spacecraft state.
protected List<double[][][]>	computeQuadElements(double[][] dOrbParams, double[] lmb, int orderFS, int quadPoints) Compute elements under integral for coefficients evaluation.
protected double[]	evaluateFS(List<double[][]> coeffs, int orderFS, double xi) Evaluate the Fourier Series.
double[]	getdPert()
String	getType()

Methods inherited from class java.lang.Object

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

Methods inherited from interface fr.cnes.sirius.patrius.stela.forces.StelaForceModel

computePartialDerivatives, computeShortPeriods

Field Detail

dPert

protected double[] dPert

Value of the perturbation derivative

Constructor Detail

AbstractStelaGaussContribution

public AbstractStelaGaussContribution()

Constructor of the class

Method Detail

getType

public String getType()

Specified by:

getType in interface StelaForceModel

Returns:

the type

getdPert

public double[] getdPert()

Returns:

the dPert

computePerturbation

public abstract double[] computePerturbation(StelaEquinoctialOrbit orbit,
                                             OrbitNatureConverter converter)
                                      throws PatriusException

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

Parameters:

orbit - current orbit information: date, kinematics

converter - mean / osculating parameters converter

Returns:

the perturbation dE/dt for the current force

Throws:

PatriusException - if perturbation computation fails

computeGaussEquations

protected double[][] computeGaussEquations(StelaEquinoctialOrbit orbit)

Compute the TNW Gauss Equation for GTO.

Parameters:

orbit - current orbit information: date, kinematics

Returns:

gaussEquations

computeGaussDerivativeEquations

protected double[][][] computeGaussDerivativeEquations(StelaEquinoctialOrbit orbit)

Computation of the Gauss equation derivatives matrix in TNW frame.

Parameters:

orbit - current orbit information: date, kinematics

Returns:

gaussDerivativeEquations

evaluateFS

protected double[] evaluateFS(List<double[][]> coeffs,
                              int orderFS,
                              double xi)

Evaluate the Fourier Series.

Parameters:

coeffs - list of coefficients of the Fourier Series

orderFS - order of the Fourier Series

xi - mean longitude at the considered state

Returns:

short periods terms

computeQuadElements

protected List<double[][][]> computeQuadElements(double[][] dOrbParams,
                                                 double[] lmb,
                                                 int orderFS,
                                                 int quadPoints)

Compute elements under integral for coefficients evaluation.

Parameters:

dOrbParams - (6 x QuadPoints) matrix containing dE/dt (computed by using Gauss Eqs.).

lmb - Vector of mean longitude at each quadrature point.

orderFS - order of the Fourier Series

quadPoints - number of quadrature points

Returns:

elements for each quadrature point

computeCoeffs

protected List<double[][]> computeCoeffs(List<double[][][]> listQuadElements,
                                         int orderFS,
                                         int quadPoints,
                                         double meanMvt,
                                         double deltaAngle)
                                  throws PatriusException

Compute elements under integral for coefficients evaluation.

Parameters:

listQuadElements - list of quadrature elements under integral [(6 x QuadPoints x orderFS) matrices]

orderFS - order of the Fourier Series

quadPoints - number of quadrature points

meanMvt - the mean motion

deltaAngle - angular step related to quadrature points discretization

Returns:

coefficients

Throws:

PatriusException - thrown if computation failed