org.orekit.forces.gravity

Class Relativity

java.lang.Object

org.orekit.forces.AbstractForceModel

org.orekit.forces.gravity.Relativity

All Implemented Interfaces:

ForceModel

public class Relativity
extends AbstractForceModel

Post-Newtonian correction force due to general relativity. The main effect is the precession of perigee by a few arcseconds per year.

Implemented from Montenbruck and Gill equation 3.146.

Author:

Evan Ward

See Also:

"Montenbruck, Oliver, and Gill, Eberhard. Satellite orbits : models, methods, and applications. Berlin New York: Springer, 2000."

Constructor Summary

Constructors

Constructor and Description
Relativity(double gm) Create a force model to add post-Newtonian acceleration corrections to an Earth orbit.

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.
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.
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

addContribution, addContribution, getParameters, getParameters, init

Constructor Detail

Relativity

public Relativity(double gm)

Create a force model to add post-Newtonian acceleration corrections to an Earth orbit.

Parameters:

gm - Earth's gravitational parameter.

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 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