Package org.orekit.forces.inertia

Class InertialForces

java.lang.Object

org.orekit.forces.inertia.InertialForces

All Implemented Interfaces:

ForceModel, EventDetectorsProvider, ParameterDriversProvider

public class InertialForces
extends Object
implements ForceModel

Inertial force model.

This force model adds the pseudo-forces due to inertia between the integrating frame and a reference inertial frame from which this force model is built.

Two typical use-cases are propagating AbsolutePVCoordinates in either:

• a non-inertial frame (for example propagating in the rotating ITRF frame),
• an inertial frame that is not related to the main attracting body (for example propagating in EME2000 frame a trajectory about the Sun and Jupiter).

In the second used case above, the attraction from the two main bodies, i.e. the Sun and Jupiter, should be represented by SingleBodyAbsoluteAttraction instances.

Author:

Guillaume Obrecht, Luc Maisonobe

See Also:

SingleBodyAbsoluteAttraction

Field Summary

Fields inherited from interface org.orekit.propagation.events.EventDetectorsProvider

DATATION_ACCURACY

Constructor Summary

Constructors

Constructor	Description
InertialForces(Frame referenceInertialFrame)	Simple constructor.

Method Summary

Modifier and Type	Method	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 model depends on position only at a given, fixed date.
List<ParameterDriver>	getParametersDrivers()	Get the drivers for parameters.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.orekit.propagation.events.EventDetectorsProvider

getEventDetectors, getFieldEventDetectors

Methods inherited from interface org.orekit.forces.ForceModel

addContribution, addContribution, dependsOnAttitudeRate, getEventDetectors, getFieldEventDetectors, init, init

Methods inherited from interface org.orekit.utils.ParameterDriversProvider

getNbParametersDriversValue, getParameterDriver, getParameters, getParameters, getParameters, getParameters, getParametersAllValues, getParametersAllValues, isSupported

Constructor Detail

InertialForces

public InertialForces(Frame referenceInertialFrame)
               throws OrekitIllegalArgumentException

Simple constructor.

Parameters:

referenceInertialFrame - the pseudo-inertial frame to use as reference for the inertial forces

Throws:

OrekitIllegalArgumentException - if frame is not a pseudo-inertial frame

Method Detail

dependsOnPositionOnly

public boolean dependsOnPositionOnly()

Check if force model depends on position only at a given, fixed date.

Specified by:

dependsOnPositionOnly in interface ForceModel

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.

Specified by:

acceleration in interface ForceModel

Parameters:

s - current state information: date, kinematics, attitude

parameters - values of the force model parameters at state date, only 1 value for each parameterDriver

Returns:

acceleration in same frame as state

acceleration

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

Compute acceleration.

Specified by:

acceleration in interface ForceModel

Type Parameters:

T - type of the elements

Parameters:

s - current state information: date, kinematics, attitude

parameters - values of the force model parameters at state date, only 1 value for each parameterDriver

Returns:

acceleration in same frame as state

getParametersDrivers

public List<ParameterDriver> getParametersDrivers()

Get the drivers for parameters.

Specified by:

getParametersDrivers in interface ParameterDriversProvider

Returns:

drivers for parameters