Package org.orekit.forces.gravity

Class OceanTides

java.lang.Object

org.orekit.forces.gravity.OceanTides

All Implemented Interfaces:

ForceModel, EventDetectorsProvider, ParameterDriversProvider

public class OceanTides
extends Object
implements ForceModel

Ocean tides force model.

Since:

6.1

Author:

Luc Maisonobe

Field Summary

Fields

Modifier and Type	Field	Description
static int	DEFAULT_POINTS	Default number of points tides field sampling.
static double	DEFAULT_STEP	Default step for tides field sampling (seconds).

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

DATATION_ACCURACY

Constructor Summary

Constructors

Constructor	Description
OceanTides(Frame centralBodyFrame, double ae, double mu, boolean poleTide, double step, int nbPoints, int degree, int order, IERSConventions conventions, UT1Scale ut1)	Simple constructor.
OceanTides(Frame centralBodyFrame, double ae, double mu, boolean poleTide, double step, int nbPoints, int degree, int order, IERSConventions conventions, UT1Scale ut1, GravityFields gravityFields)	Simple constructor.
OceanTides(Frame centralBodyFrame, double ae, double mu, int degree, int order, IERSConventions conventions, UT1Scale ut1)	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.
Stream<EventDetector>	getEventDetectors()	Get the discrete events related to the model.
<T extends CalculusFieldElement<T>> Stream<FieldEventDetector<T>>	getFieldEventDetectors(Field<T> field)	Get the discrete events related to the model.
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, init, init

Methods inherited from interface org.orekit.utils.ParameterDriversProvider

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

Field Detail

DEFAULT_STEP

public static final double DEFAULT_STEP

Default step for tides field sampling (seconds).

See Also:

Constant Field Values

DEFAULT_POINTS

public static final int DEFAULT_POINTS

Default number of points tides field sampling.

See Also:

Constant Field Values

Constructor Detail

OceanTides

@DefaultDataContext
public OceanTides(Frame centralBodyFrame,
                  double ae,
                  double mu,
                  int degree,
                  int order,
                  IERSConventions conventions,
                  UT1Scale ut1)

Simple constructor.

This constructor uses pole tides, the default step and default number of points for the tides field interpolation.

This constructor uses the default data context.

Parameters:

centralBodyFrame - rotating body frame

ae - central body reference radius

mu - central body attraction coefficient

degree - degree of the tide model to load

order - order of the tide model to load

conventions - IERS conventions used for loading ocean pole tide

ut1 - UT1 time scale

See Also:

DEFAULT_STEP, DEFAULT_POINTS, OceanTides(Frame, double, double, boolean, double, int, int, int, IERSConventions, UT1Scale), GravityFields.getOceanTidesWaves(int, int), OceanTides(Frame, double, double, boolean, double, int, int, int, IERSConventions, UT1Scale, GravityFields)

OceanTides

@DefaultDataContext
public OceanTides(Frame centralBodyFrame,
                  double ae,
                  double mu,
                  boolean poleTide,
                  double step,
                  int nbPoints,
                  int degree,
                  int order,
                  IERSConventions conventions,
                  UT1Scale ut1)

Simple constructor.

This constructor uses the default data context.

Parameters:

centralBodyFrame - rotating body frame

ae - central body reference radius

mu - central body attraction coefficient

poleTide - if true, pole tide is computed

step - time step between sample points for interpolation

nbPoints - number of points to use for interpolation, if less than 2 then no interpolation is performed (thus greatly increasing computation cost)

degree - degree of the tide model to load

order - order of the tide model to load

conventions - IERS conventions used for loading ocean pole tide

ut1 - UT1 time scale

See Also:

GravityFields.getOceanTidesWaves(int, int), OceanTides(Frame, double, double, boolean, double, int, int, int, IERSConventions, UT1Scale, GravityFields)

OceanTides

public OceanTides(Frame centralBodyFrame,
                  double ae,
                  double mu,
                  boolean poleTide,
                  double step,
                  int nbPoints,
                  int degree,
                  int order,
                  IERSConventions conventions,
                  UT1Scale ut1,
                  GravityFields gravityFields)

Simple constructor.

Parameters:

centralBodyFrame - rotating body frame

ae - central body reference radius

mu - central body attraction coefficient

poleTide - if true, pole tide is computed

step - time step between sample points for interpolation

nbPoints - number of points to use for interpolation, if less than 2 then no interpolation is performed (thus greatly increasing computation cost)

degree - degree of the tide model to load

order - order of the tide model to load

conventions - IERS conventions used for loading ocean pole tide

ut1 - UT1 time scale

gravityFields - used to compute ocean tides.

Since:

10.1

See Also:

GravityFields.getOceanTidesWaves(int, int)

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

getEventDetectors

public Stream<EventDetector> getEventDetectors()

Get the discrete events related to the model.

This method is not intended to be called several time, only once by a propagator, as it has the side effect of rebuilding the events detectors when called.

Specified by:

getEventDetectors in interface EventDetectorsProvider

Specified by:

getEventDetectors in interface ForceModel

Returns:

stream of event detectors

getFieldEventDetectors

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

Get the discrete events related to the model.

This method is not intended to be called several time, only once by a propagator, as it has the side effect of rebuilding the events detectors when called.

Specified by:

getFieldEventDetectors in interface EventDetectorsProvider

Specified by:

getFieldEventDetectors in interface ForceModel

Type Parameters:

T - extends CalculusFieldElement<T>

Parameters:

field - field to which the state belongs

Returns:

stream of event detectors

getParametersDrivers

public List<ParameterDriver> getParametersDrivers()

Get the drivers for parameters.

Specified by:

getParametersDrivers in interface ParameterDriversProvider

Returns:

drivers for parameters