org.orekit.forces.radiation

Class IsotropicRadiationClassicalConvention

java.lang.Object

org.orekit.forces.radiation.IsotropicRadiationClassicalConvention

All Implemented Interfaces:

RadiationSensitive

public class IsotropicRadiationClassicalConvention
extends Object
implements RadiationSensitive

This class represents the features of a simplified spacecraft.

This model uses the classical thermo-optical coefficients Ca for absorption, Cs for specular reflection and Kd for diffuse reflection. The equation Ca + Cs + Cd = 1 always holds.

A less standard set of coefficients α = Ca for absorption and τ = Cs/(1-Ca) for specular reflection is implemented in the sister class IsotropicRadiationCNES95Convention.

Since:

7.1

Author:

Luc Maisonobe

See Also:

BoxAndSolarArraySpacecraft, IsotropicDrag, IsotropicRadiationCNES95Convention

Field Summary

Fields inherited from interface org.orekit.forces.radiation.RadiationSensitive

ABSORPTION_COEFFICIENT, REFLECTION_COEFFICIENT

Constructor Summary

Constructors

Constructor and Description
IsotropicRadiationClassicalConvention(double crossSection, double ca, double cs) Simple constructor.

Method Summary

Modifier and Type	Method and Description
double	getAbsorptionCoefficient() Get the absorption coefficient.
double	getReflectionCoefficient() Get the specular reflection coefficient.
org.apache.commons.math3.geometry.euclidean.threed.FieldVector3D<org.apache.commons.math3.analysis.differentiation.DerivativeStructure>	radiationPressureAcceleration(AbsoluteDate date, Frame frame, org.apache.commons.math3.geometry.euclidean.threed.FieldVector3D<org.apache.commons.math3.analysis.differentiation.DerivativeStructure> position, org.apache.commons.math3.geometry.euclidean.threed.FieldRotation<org.apache.commons.math3.analysis.differentiation.DerivativeStructure> rotation, org.apache.commons.math3.analysis.differentiation.DerivativeStructure mass, org.apache.commons.math3.geometry.euclidean.threed.FieldVector3D<org.apache.commons.math3.analysis.differentiation.DerivativeStructure> flux) Compute the acceleration due to radiation pressure, with state derivatives.
org.apache.commons.math3.geometry.euclidean.threed.Vector3D	radiationPressureAcceleration(AbsoluteDate date, Frame frame, org.apache.commons.math3.geometry.euclidean.threed.Vector3D position, org.apache.commons.math3.geometry.euclidean.threed.Rotation rotation, double mass, org.apache.commons.math3.geometry.euclidean.threed.Vector3D flux) Compute the acceleration due to radiation pressure.
org.apache.commons.math3.geometry.euclidean.threed.FieldVector3D<org.apache.commons.math3.analysis.differentiation.DerivativeStructure>	radiationPressureAcceleration(AbsoluteDate date, Frame frame, org.apache.commons.math3.geometry.euclidean.threed.Vector3D position, org.apache.commons.math3.geometry.euclidean.threed.Rotation rotation, double mass, org.apache.commons.math3.geometry.euclidean.threed.Vector3D flux, String paramName) Compute the acceleration due to radiation pressure, with parameters derivatives.
void	setAbsorptionCoefficient(double value) Set the absorption coefficient.
void	setReflectionCoefficient(double value) Set the specular reflection coefficient.

Methods inherited from class java.lang.Object

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

Constructor Detail

IsotropicRadiationClassicalConvention

public IsotropicRadiationClassicalConvention(double crossSection,
                                             double ca,
                                             double cs)

Simple constructor.

Parameters:

crossSection - Surface (m²)

ca - absorption coefficient Ca between 0.0 an 1.0

cs - specular reflection coefficient Cs between 0.0 an 1.0

Method Detail

radiationPressureAcceleration

public org.apache.commons.math3.geometry.euclidean.threed.Vector3D radiationPressureAcceleration(AbsoluteDate date,
                                                                                                 Frame frame,
                                                                                                 org.apache.commons.math3.geometry.euclidean.threed.Vector3D position,
                                                                                                 org.apache.commons.math3.geometry.euclidean.threed.Rotation rotation,
                                                                                                 double mass,
                                                                                                 org.apache.commons.math3.geometry.euclidean.threed.Vector3D flux)

Compute the acceleration due to radiation pressure.

Specified by:

radiationPressureAcceleration in interface RadiationSensitive

Parameters:

date - current date

frame - inertial reference frame for state (both orbit and attitude)

position - position of spacecraft in reference frame

rotation - orientation (attitude) of the spacecraft with respect to reference frame

mass - current mass

flux - radiation flux in the same inertial frame as spacecraft orbit

Returns:

spacecraft acceleration in the same inertial frame as spacecraft orbit (m/s²)

radiationPressureAcceleration

public org.apache.commons.math3.geometry.euclidean.threed.FieldVector3D<org.apache.commons.math3.analysis.differentiation.DerivativeStructure> radiationPressureAcceleration(AbsoluteDate date,
                                                                                                                                                                             Frame frame,
                                                                                                                                                                             org.apache.commons.math3.geometry.euclidean.threed.FieldVector3D<org.apache.commons.math3.analysis.differentiation.DerivativeStructure> position,
                                                                                                                                                                             org.apache.commons.math3.geometry.euclidean.threed.FieldRotation<org.apache.commons.math3.analysis.differentiation.DerivativeStructure> rotation,
                                                                                                                                                                             org.apache.commons.math3.analysis.differentiation.DerivativeStructure mass,
                                                                                                                                                                             org.apache.commons.math3.geometry.euclidean.threed.FieldVector3D<org.apache.commons.math3.analysis.differentiation.DerivativeStructure> flux)

Compute the acceleration due to radiation pressure, with state derivatives.

Specified by:

radiationPressureAcceleration in interface RadiationSensitive

Parameters:

date - current date

frame - inertial reference frame for state (both orbit and attitude)

position - position of spacecraft in reference frame

rotation - orientation (attitude) of the spacecraft with respect to reference frame

mass - spacecraft mass

flux - radiation flux in the same inertial frame as spacecraft orbit

Returns:

spacecraft acceleration in the same inertial frame as spacecraft orbit (m/s²)

radiationPressureAcceleration

public org.apache.commons.math3.geometry.euclidean.threed.FieldVector3D<org.apache.commons.math3.analysis.differentiation.DerivativeStructure> radiationPressureAcceleration(AbsoluteDate date,
                                                                                                                                                                             Frame frame,
                                                                                                                                                                             org.apache.commons.math3.geometry.euclidean.threed.Vector3D position,
                                                                                                                                                                             org.apache.commons.math3.geometry.euclidean.threed.Rotation rotation,
                                                                                                                                                                             double mass,
                                                                                                                                                                             org.apache.commons.math3.geometry.euclidean.threed.Vector3D flux,
                                                                                                                                                                             String paramName)
                                                                                                                                                                      throws OrekitException

Compute the acceleration due to radiation pressure, with parameters derivatives.

Specified by:

radiationPressureAcceleration in interface RadiationSensitive

Parameters:

date - current date

frame - inertial reference frame for state (both orbit and attitude)

position - position of spacecraft in reference frame

rotation - orientation (attitude) of the spacecraft with respect to reference frame

mass - current mass

flux - radiation flux in the same inertial frame as spacecraft orbit

paramName - name of the parameter with respect to which derivatives are required

Returns:

spacecraft acceleration in the same inertial frame as spacecraft orbit (m/s²)

Throws:

OrekitException - if acceleration cannot be computed

setAbsorptionCoefficient

public void setAbsorptionCoefficient(double value)

Set the absorption coefficient.

Specified by:

setAbsorptionCoefficient in interface RadiationSensitive

Parameters:

value - absorption coefficient

getAbsorptionCoefficient

public double getAbsorptionCoefficient()

Get the absorption coefficient.

Specified by:

getAbsorptionCoefficient in interface RadiationSensitive

Returns:

absorption coefficient

setReflectionCoefficient

public void setReflectionCoefficient(double value)

Set the specular reflection coefficient.

Specified by:

setReflectionCoefficient in interface RadiationSensitive

Parameters:

value - specular reflection coefficient

getReflectionCoefficient

public double getReflectionCoefficient()

Get the specular reflection coefficient.

Specified by:

getReflectionCoefficient in interface RadiationSensitive

Returns:

reflection coefficient