org.orekit.forces.gravity

Class NewtonianAttraction

java.lang.Object

org.orekit.forces.AbstractForceModel

org.orekit.forces.gravity.NewtonianAttraction

All Implemented Interfaces:

ForceModel

public class NewtonianAttraction
extends AbstractForceModel

Force model for Newtonian central body attraction.

Author:

Luc Maisonobe

Field Summary

Fields

Modifier and Type	Field and Description
static String	CENTRAL_ATTRACTION_COEFFICIENT Name of the single parameter of this model: the central attraction coefficient.

Constructor Summary

Constructors

Constructor and Description
NewtonianAttraction(double mu) Simple constructor.

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>> void	addContribution(FieldSpacecraftState<T> s, FieldTimeDerivativesEquations<T> adder) Compute the contribution of the force model to the perturbing acceleration.
void	addContribution(SpacecraftState s, TimeDerivativesEquations adder) Compute the contribution of the force model to the perturbing acceleration.
boolean	dependsOnPositionOnly() Check if force models depends on position only.
Stream<EventDetector>	getEventsDetectors() Get the discrete events related to the model.
<T extends CalculusFieldElement<T>> Stream<FieldEventDetector<T>>	getFieldEventsDetectors(Field<T> field) Get the discrete events related to the model.
double	getMu() Get the central attraction coefficient μ.
<T extends CalculusFieldElement<T>> T	getMu(Field<T> field) Get the central attraction coefficient μ.
List<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

getParameters, getParameters, init, init

Field Detail

CENTRAL_ATTRACTION_COEFFICIENT

public static final String CENTRAL_ATTRACTION_COEFFICIENT

Name of the single parameter of this model: the central attraction coefficient.

See Also:

Constant Field Values

Constructor Detail

NewtonianAttraction

public NewtonianAttraction(double mu)

Simple constructor.

Parameters:

mu - central attraction coefficient (m^3/s^2)

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

getMu

public double getMu()

Get the central attraction coefficient μ.

Returns:

mu central attraction coefficient (m³/s²)

getMu

public <T extends CalculusFieldElement<T>> T getMu(Field<T> field)

Get the central attraction coefficient μ.

Type Parameters:

T - the type of the field element

Parameters:

field - field to which the state belongs

Returns:

mu central attraction coefficient (m³/s²)

addContribution

public void addContribution(SpacecraftState s,
                            TimeDerivativesEquations adder)

Compute the contribution of the force model to the perturbing acceleration.

The default implementation simply adds the acceleration as a non-Keplerian acceleration.

Parameters:

s - current state information: date, kinematics, attitude

adder - object where the contribution should be added

addContribution

public <T extends CalculusFieldElement<T>> void addContribution(FieldSpacecraftState<T> s,
                                                                FieldTimeDerivativesEquations<T> adder)

Compute the contribution of the force model to the perturbing acceleration.

Type Parameters:

T - type of the elements

Parameters:

s - current state information: date, kinematics, attitude

adder - object where the contribution should be added

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

getEventsDetectors

public Stream<EventDetector> getEventsDetectors()

Get the discrete events related to the model.

Returns:

stream of events detectors

getFieldEventsDetectors

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

Get the discrete events related to the model.

Type Parameters:

T - extends CalculusFieldElement<T>

Parameters:

field - field to which the state belongs

Returns:

stream of events detectors

getParametersDrivers

public List<ParameterDriver> getParametersDrivers()

Get the drivers for force model parameters.

Returns:

drivers for force model parameters