Package org.orekit.propagation.conversion

Class AbstractPropagatorBuilder

java.lang.Object

org.orekit.propagation.conversion.AbstractPropagatorBuilder

All Implemented Interfaces:

PropagatorBuilder

Direct Known Subclasses:

BrouwerLyddanePropagatorBuilder, DSSTPropagatorBuilder, EcksteinHechlerPropagatorBuilder, EphemerisPropagatorBuilder, KeplerianPropagatorBuilder, NumericalPropagatorBuilder, TLEPropagatorBuilder

public abstract class AbstractPropagatorBuilder
extends Object
implements PropagatorBuilder

Base class for propagator builders.

Since:

7.1

Author:

Pascal Parraud

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AbstractPropagatorBuilder(Orbit templateOrbit, PositionAngleType positionAngleType, double positionScale, boolean addDriverForCentralAttraction)	Build a new instance.
protected	AbstractPropagatorBuilder(Orbit templateOrbit, PositionAngleType positionAngleType, double positionScale, boolean addDriverForCentralAttraction, AttitudeProvider attitudeProvider)	Build a new instance.

Method Summary

Modifier and Type	Method	Description
void	addAdditionalDerivativesProvider(AdditionalDerivativesProvider provider)	Add a set of user-specified equations to be integrated along with the orbit propagation (author Shiva Iyer).
protected void	addSupportedParameters(List<ParameterDriver> drivers)	Add supported parameters.
protected Orbit	createInitialOrbit()	Build an initial orbit using the current selected parameters.
void	deselectDynamicParameters()	Deselects orbital and propagation drivers.
protected List<AdditionalDerivativesProvider>	getAdditionalDerivativesProviders()	Get the list of additional equations.
AttitudeProvider	getAttitudeProvider()	Get the attitude provider.
Frame	getFrame()	Get the frame in which the orbit is propagated.
AbsoluteDate	getInitialOrbitDate()	Get the date of the initial orbit.
double	getMu()	Get the central attraction coefficient (µ - m³/s²) value.
ParameterDriversList	getOrbitalParametersDrivers()	Get the drivers for the configurable orbital parameters.
OrbitType	getOrbitType()	Get the orbit type expected for the 6 first parameters in PropagatorBuilder.buildPropagator(double[]).
PositionAngleType	getPositionAngleType()	Get the position angle type expected for the 6 first parameters in PropagatorBuilder.buildPropagator(double[]).
double	getPositionScale()	Get the position scale.
ParameterDriversList	getPropagationParametersDrivers()	Get the drivers for the configurable propagation parameters.
double[]	getSelectedNormalizedParameters()	Get the current value of selected normalized parameters.
void	resetOrbit(Orbit newOrbit)	Reset the orbit in the propagator builder.
void	setAttitudeProvider(AttitudeProvider attitudeProvider)	Set the attitude provider.
protected void	setParameters(double[] normalizedParameters)	Set the selected 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.conversion.PropagatorBuilder

buildLeastSquaresModel, buildPropagator, buildPropagator, copy

Constructor Detail

AbstractPropagatorBuilder

protected AbstractPropagatorBuilder(Orbit templateOrbit,
                                    PositionAngleType positionAngleType,
                                    double positionScale,
                                    boolean addDriverForCentralAttraction)

Build a new instance.

The template orbit is used as a model to create initial orbit. It defines the inertial frame, the central attraction coefficient, the orbit type, and is also used together with the positionScale to convert from the normalized parameters used by the callers of this builder to the real orbital parameters. The default attitude provider is aligned with the orbit's inertial frame.

By default, all the orbital parameters drivers are selected, which means that if the builder is used for orbit determination or propagator conversion, all orbital parameters will be estimated. If only a subset of the orbital parameters must be estimated, caller must retrieve the orbital parameters by calling getOrbitalParametersDrivers() and then call setSelected(false).

Parameters:

templateOrbit - reference orbit from which real orbits will be built

positionAngleType - position angle type to use

positionScale - scaling factor used for orbital parameters normalization (typically set to the expected standard deviation of the position)

addDriverForCentralAttraction - if true, a ParameterDriver should be set up for central attraction coefficient

Since:

8.0

See Also:

AbstractPropagatorBuilder(Orbit, PositionAngleType, double, boolean, AttitudeProvider)

AbstractPropagatorBuilder

protected AbstractPropagatorBuilder(Orbit templateOrbit,
                                    PositionAngleType positionAngleType,
                                    double positionScale,
                                    boolean addDriverForCentralAttraction,
                                    AttitudeProvider attitudeProvider)

Build a new instance.

The template orbit is used as a model to create initial orbit. It defines the inertial frame, the central attraction coefficient, the orbit type, and is also used together with the positionScale to convert from the normalized parameters used by the callers of this builder to the real orbital parameters.

By default, all the orbital parameters drivers are selected, which means that if the builder is used for orbit determination or propagator conversion, all orbital parameters will be estimated. If only a subset of the orbital parameters must be estimated, caller must retrieve the orbital parameters by calling getOrbitalParametersDrivers() and then call setSelected(false).

Parameters:

templateOrbit - reference orbit from which real orbits will be built

positionAngleType - position angle type to use

positionScale - scaling factor used for orbital parameters normalization (typically set to the expected standard deviation of the position)

addDriverForCentralAttraction - if true, a ParameterDriver should be set up for central attraction coefficient

attitudeProvider - for the propagator.

Since:

10.1

See Also:

AbstractPropagatorBuilder(Orbit, PositionAngleType, double, boolean)

Method Detail

getOrbitType

public OrbitType getOrbitType()

Get the orbit type expected for the 6 first parameters in PropagatorBuilder.buildPropagator(double[]).

Specified by:

getOrbitType in interface PropagatorBuilder

Returns:

orbit type to use in PropagatorBuilder.buildPropagator(double[])

See Also:

PropagatorBuilder.buildPropagator(double[]), PropagatorBuilder.getPositionAngleType()

getPositionAngleType

public PositionAngleType getPositionAngleType()

Get the position angle type expected for the 6 first parameters in PropagatorBuilder.buildPropagator(double[]).

Specified by:

getPositionAngleType in interface PropagatorBuilder

Returns:

position angle type to use in PropagatorBuilder.buildPropagator(double[])

See Also:

PropagatorBuilder.buildPropagator(double[]), PropagatorBuilder.getOrbitType()

getInitialOrbitDate

public AbsoluteDate getInitialOrbitDate()

Get the date of the initial orbit.

Specified by:

getInitialOrbitDate in interface PropagatorBuilder

Returns:

date of the initial orbit

getFrame

public Frame getFrame()

Get the frame in which the orbit is propagated.

Specified by:

getFrame in interface PropagatorBuilder

Returns:

frame in which the orbit is propagated

getOrbitalParametersDrivers

public ParameterDriversList getOrbitalParametersDrivers()

Get the drivers for the configurable orbital parameters. Orbital drivers should have only 1 value estimated (1 span)

Specified by:

getOrbitalParametersDrivers in interface PropagatorBuilder

Returns:

drivers for the configurable orbital parameters

getPropagationParametersDrivers

public ParameterDriversList getPropagationParametersDrivers()

Get the drivers for the configurable propagation parameters.

The parameters typically correspond to force models.

Specified by:

getPropagationParametersDrivers in interface PropagatorBuilder

Returns:

drivers for the configurable propagation parameters

getAttitudeProvider

public AttitudeProvider getAttitudeProvider()

Get the attitude provider.

Returns:

the attitude provider

Since:

10.1

setAttitudeProvider

public void setAttitudeProvider(AttitudeProvider attitudeProvider)

Set the attitude provider.

Parameters:

attitudeProvider - attitude provider

Since:

10.1

getPositionScale

public double getPositionScale()

Get the position scale.

Returns:

the position scale used to scale the orbital drivers

getMu

public double getMu()

Get the central attraction coefficient (µ - m³/s²) value.

Specified by:

getMu in interface PropagatorBuilder

Returns:

the central attraction coefficient (µ - m³/s²) value

getSelectedNormalizedParameters

public double[] getSelectedNormalizedParameters()

Get the current value of selected normalized parameters.

Specified by:

getSelectedNormalizedParameters in interface PropagatorBuilder

Returns:

current value of selected normalized parameters

createInitialOrbit

protected Orbit createInitialOrbit()

Build an initial orbit using the current selected parameters.

This method is a stripped down version of PropagatorBuilder.buildPropagator(double[]) that only builds the initial orbit and not the full propagator.

Returns:

an initial orbit

Since:

8.0

setParameters

protected void setParameters(double[] normalizedParameters)

Set the selected parameters.

Parameters:

normalizedParameters - normalized values for the selected parameters

addSupportedParameters

protected void addSupportedParameters(List<ParameterDriver> drivers)

Add supported parameters.

Parameters:

drivers - drivers for the parameters

resetOrbit

public void resetOrbit(Orbit newOrbit)

Reset the orbit in the propagator builder.

Specified by:

resetOrbit in interface PropagatorBuilder

Parameters:

newOrbit - New orbit to set in the propagator builder

addAdditionalDerivativesProvider

public void addAdditionalDerivativesProvider(AdditionalDerivativesProvider provider)

Add a set of user-specified equations to be integrated along with the orbit propagation (author Shiva Iyer).

Parameters:

provider - provider for additional derivatives

Since:

11.1

getAdditionalDerivativesProviders

protected List<AdditionalDerivativesProvider> getAdditionalDerivativesProviders()

Get the list of additional equations.

Returns:

the list of additional equations

Since:

11.1

deselectDynamicParameters

public void deselectDynamicParameters()

Deselects orbital and propagation drivers.