org.orekit.forces.radiation

Class SolarRadiationPressure

java.lang.Object

org.orekit.forces.AbstractForceModel

org.orekit.forces.radiation.AbstractRadiationForceModel

org.orekit.forces.radiation.SolarRadiationPressure

All Implemented Interfaces:

ForceModel

public class SolarRadiationPressure
extends AbstractRadiationForceModel

Solar radiation pressure force model.

Since Orekit 11.0, it is possible to take into account the eclipses generated by Moon in the solar radiation pressure force model using the AbstractRadiationForceModel.addOccultingBody(ExtendedPVCoordinatesProvider, double) method.

Example:
SolarRadiationPressure srp = new SolarRadiationPressure(CelestialBodyFactory.getSun(), Constants.EIGEN5C_EARTH_EQUATORIAL_RADIUS, new IsotropicRadiationClassicalConvention(50.0, 0.5, 0.5));
srp.addOccultingBody(CelestialBodyFactory.getMoon(), Constants.MOON_EQUATORIAL_RADIUS);

Author:

Fabien Maussion, Édouard Delente, Véronique Pommier-Maurussane, Pascal Parraud

Constructor Summary

Constructors

Constructor and Description
SolarRadiationPressure(double dRef, double pRef, ExtendedPVCoordinatesProvider sun, double equatorialRadius, RadiationSensitive spacecraft) Complete constructor.
SolarRadiationPressure(ExtendedPVCoordinatesProvider sun, double equatorialRadius, RadiationSensitive spacecraft) Simple constructor with default reference values.

Method Summary

Modifier and Type	Method and Description
<T extends CalculusFieldElement<T>> FieldVector3D<T>	acceleration(FieldSpacecraftState<T> s, T[] parameters) Compute acceleration.
Vector3D	acceleration(SpacecraftState s, double[] parameters) Compute acceleration.
<T extends CalculusFieldElement<T>> T	getGeneralEclipseRatio(FieldVector3D<T> position, FieldVector3D<T> occultingPosition, T occultingRadius, FieldVector3D<T> occultedPosition, T occultedRadius) Get eclipse ratio between to bodies seen from a specific object.
double	getGeneralEclipseRatio(Vector3D position, Vector3D occultingPosition, double occultingRadius, Vector3D occultedPosition, double occultedRadius) Get eclipse ratio between to bodies seen from a specific object.
<T extends CalculusFieldElement<T>> T	getLightingRatio(FieldVector3D<T> position, Frame frame, FieldAbsoluteDate<T> date) Get the lighting ratio ([0-1]).
double	getLightingRatio(Vector3D position, Frame frame, AbsoluteDate date) Get the lighting ratio ([0-1]).
List<ParameterDriver>	getParametersDrivers() Get the drivers for force model parameters.
<T extends CalculusFieldElement<T>> T	getTotalLightingRatio(FieldVector3D<T> position, Frame frame, FieldAbsoluteDate<T> date) Get the total lighting ratio ([0-1]).
double	getTotalLightingRatio(Vector3D position, Frame frame, AbsoluteDate date) Get the total lighting ratio ([0-1]).

Methods inherited from class org.orekit.forces.radiation.AbstractRadiationForceModel

addOccultingBody, dependsOnPositionOnly, getEclipseAngles, getEclipseAngles, getEquatorialRadius, getEventsDetectors, getFieldEventsDetectors, getGeneralEclipseAngles, getGeneralEclipseAngles, getOtherOccultingBodies

Methods inherited from class org.orekit.forces.AbstractForceModel

complainIfNotSupported, getParameterDriver, isSupported

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.orekit.forces.ForceModel

addContribution, addContribution, getParameters, getParameters, init, init

Constructor Detail

SolarRadiationPressure

public SolarRadiationPressure(ExtendedPVCoordinatesProvider sun,
                              double equatorialRadius,
                              RadiationSensitive spacecraft)

Simple constructor with default reference values.

When this constructor is used, the reference values are:

• d_ref = 149597870000.0 m
• p_ref = 4.56 10^-6 N/m²

Parameters:

sun - Sun model

equatorialRadius - spherical shape model (for umbra/penumbra computation)

spacecraft - the object physical and geometrical information

Since:

9.2

SolarRadiationPressure

public SolarRadiationPressure(double dRef,
                              double pRef,
                              ExtendedPVCoordinatesProvider sun,
                              double equatorialRadius,
                              RadiationSensitive spacecraft)

Complete constructor.

Note that reference solar radiation pressure pRef in N/m² is linked to solar flux SF in W/m² using formula pRef = SF/c where c is the speed of light (299792458 m/s). So at 1UA a 1367 W/m² solar flux is a 4.56 10^-6 N/m² solar radiation pressure.

Parameters:

dRef - reference distance for the solar radiation pressure (m)

pRef - reference solar radiation pressure at dRef (N/m²)

sun - Sun model

equatorialRadius - spherical shape model (for umbra/penumbra computation)

spacecraft - the object physical and geometrical information

Since:

9.2

Method Detail

acceleration

public Vector3D acceleration(SpacecraftState s,
                             double[] parameters)

Compute acceleration.

Parameters:

s - current state information: date, kinematics, attitude

parameters - values of the force model parameters

Returns:

acceleration in same frame as state

acceleration

public <T extends CalculusFieldElement<T>> FieldVector3D<T> acceleration(FieldSpacecraftState<T> s,
                                                                         T[] parameters)

Compute acceleration.

Type Parameters:

T - type of the elements

Parameters:

s - current state information: date, kinematics, attitude

parameters - values of the force model parameters

Returns:

acceleration in same frame as state

getLightingRatio

public double getLightingRatio(Vector3D position,
                               Frame frame,
                               AbsoluteDate date)

Get the lighting ratio ([0-1]). Considers only central body as occulting body.

Parameters:

position - the satellite's position in the selected frame.

frame - in which is defined the position

date - the date

Returns:

lighting ratio

Since:

7.1

getGeneralEclipseRatio

public double getGeneralEclipseRatio(Vector3D position,
                                     Vector3D occultingPosition,
                                     double occultingRadius,
                                     Vector3D occultedPosition,
                                     double occultedRadius)

Get eclipse ratio between to bodies seen from a specific object. Ratio is in [0-1].

Parameters:

position - the satellite's position in the selected frame

occultingPosition - the position of the occulting object

occultingRadius - the mean radius of the occulting object

occultedPosition - the position of the occulted object

occultedRadius - the mean radius of the occulted object

Returns:

eclipse ratio

getTotalLightingRatio

public double getTotalLightingRatio(Vector3D position,
                                    Frame frame,
                                    AbsoluteDate date)

Get the total lighting ratio ([0-1]). This method considers every occulting bodies.

Parameters:

position - the satellite's position in the selected frame.

frame - in which is defined the position

date - the date

Returns:

lighting ratio

getLightingRatio

public <T extends CalculusFieldElement<T>> T getLightingRatio(FieldVector3D<T> position,
                                                              Frame frame,
                                                              FieldAbsoluteDate<T> date)

Get the lighting ratio ([0-1]). Considers only central body as occulting body.

Type Parameters:

T - extends CalculusFieldElement

Parameters:

position - the satellite's position in the selected frame.

frame - in which is defined the position

date - the date

Returns:

lighting ratio

Since:

7.1

getGeneralEclipseRatio

public <T extends CalculusFieldElement<T>> T getGeneralEclipseRatio(FieldVector3D<T> position,
                                                                    FieldVector3D<T> occultingPosition,
                                                                    T occultingRadius,
                                                                    FieldVector3D<T> occultedPosition,
                                                                    T occultedRadius)

Get eclipse ratio between to bodies seen from a specific object. Ratio is in [0-1].

Type Parameters:

T - extends RealFieldElement

Parameters:

position - the satellite's position in the selected frame

occultingPosition - the position of the occulting object

occultingRadius - the mean radius of the occulting object

occultedPosition - the position of the occulted object

occultedRadius - the mean radius of the occulted object

Returns:

eclipse ratio

getTotalLightingRatio

public <T extends CalculusFieldElement<T>> T getTotalLightingRatio(FieldVector3D<T> position,
                                                                   Frame frame,
                                                                   FieldAbsoluteDate<T> date)

Get the total lighting ratio ([0-1]). This method considers every occulting bodies.

Type Parameters:

T - extends RealFieldElement

Parameters:

position - the satellite's position in the selected frame.

frame - in which is defined the position

date - the date

Returns:

lighting rati

getParametersDrivers

public List<ParameterDriver> getParametersDrivers()

Get the drivers for force model parameters.

Returns:

drivers for force model parameters