org.orekit.forces.drag

Class DragForce

java.lang.Object

org.orekit.forces.AbstractForceModel

org.orekit.forces.drag.DragForce

All Implemented Interfaces:

ForceModel

public class DragForce
extends AbstractForceModel

Atmospheric drag force model. The drag acceleration is computed as follows : γ = (1/2 * ρ * V² * S / Mass) * DragCoefVector With DragCoefVector = {C_x, C_y, C_z} and S given by the user through the interface DragSensitive

Author:

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

Constructor Summary

Constructors

Constructor and Description
DragForce(Atmosphere atmosphere, DragSensitive spacecraft) Simple constructor.

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.
Atmosphere	getAtmosphere() Get the atmospheric model.
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.
ParameterDriver[]	getParametersDrivers() Get the drivers for force model parameters.
DragSensitive	getSpacecraft() Get spacecraft that are sensitive to atmospheric drag forces.

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

DragForce

public DragForce(Atmosphere atmosphere,
                 DragSensitive spacecraft)

Simple constructor.

Parameters:

atmosphere - atmospheric model

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)

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 RealFieldElement<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

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<T>

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

getAtmosphere

public Atmosphere getAtmosphere()

Get the atmospheric model.

Returns:

atmosphere model

getSpacecraft

public DragSensitive getSpacecraft()

Get spacecraft that are sensitive to atmospheric drag forces.

Returns:

drag sensitive spacecraft model