org.orekit.forces.radiation

Class SolarRadiationPressure

java.lang.Object

org.orekit.forces.AbstractForceModel

org.orekit.forces.radiation.SolarRadiationPressure

All Implemented Interfaces:

ForceModel

public class SolarRadiationPressure
extends AbstractForceModel

Solar radiation pressure force model.

Author:

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

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
<T extends RealFieldElement<T>> FieldVector3D<T>	acceleration(FieldSpacecraftState<T> s, T[] parameters) Compute acceleration.
Vector3D	acceleration(SpacecraftState s, double[] parameters) Compute acceleration.
boolean	dependsOnPositionOnly() Check if force models depends on position only.
Stream<EventDetector>	getEventsDetectors() Get the discrete events related to the model.
<T extends RealFieldElement<T>> Stream<FieldEventDetector<T>>	getFieldEventsDetectors(Field<T> field) Get the discrete events related to the model.
<T extends RealFieldElement<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]).
ParameterDriver[]	getParametersDrivers() Get the drivers for force model parameters.

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

Constructor Detail

SolarRadiationPressure

public SolarRadiationPressure(PVCoordinatesProvider 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

SolarRadiationPressure

public SolarRadiationPressure(double dRef,
                              double pRef,
                              PVCoordinatesProvider 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

Method Detail

dependsOnPositionOnly

public boolean dependsOnPositionOnly()

Check if force models depends on position only.

Returns:

true if force model depends on position only, false if it depends on velocity, either directly or due to a dependency on attitude

acceleration

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

Compute acceleration.

Parameters:

s - current state information: date, kinematics, attitude

parameters - values of the force model parameters

Returns:

acceleration in same frame as state

Throws:

OrekitException - if some specific error occurs

acceleration

public <T extends RealFieldElement<T>> FieldVector3D<T> acceleration(FieldSpacecraftState<T> s,
                                                                     T[] parameters)
                                                              throws OrekitException

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

Throws:

OrekitException - if some specific error occurs

getLightingRatio

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

Get the lighting ratio ([0-1]).

Parameters:

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

frame - in which is defined the position

date - the date

Returns:

lighting ratio

Throws:

OrekitException - if the trajectory is inside the central body

Since:

7.1

getLightingRatio

public <T extends RealFieldElement<T>> T getLightingRatio(FieldVector3D<T> position,
                                                          Frame frame,
                                                          FieldAbsoluteDate<T> date)
                                                   throws OrekitException

Get the lighting ratio ([0-1]).

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 ratio

Throws:

OrekitException - if the trajectory is inside the central body

Since:

7.1

getEventsDetectors

public Stream<EventDetector> getEventsDetectors()

Get the discrete events related to the model.

Returns:

stream of events detectors

getFieldEventsDetectors

public <T extends RealFieldElement<T>> Stream<FieldEventDetector<T>> getFieldEventsDetectors(Field<T> field)

Get the discrete events related to the model.

Type Parameters:

T - extends RealFieldElement

Parameters:

field - field to which the state belongs

Returns:

stream of events detectors

getParametersDrivers

public ParameterDriver[] getParametersDrivers()

Get the drivers for force model parameters.

Returns:

drivers for force model parameters