Package org.orekit.propagation

Class FieldAbstractPropagator<T extends CalculusFieldElement<T>>

java.lang.Object

org.orekit.propagation.FieldAbstractPropagator<T>

Type Parameters:

T - the type of the field elements

All Implemented Interfaces:

FieldPropagator<T>, FieldPVCoordinatesProvider<T>

Direct Known Subclasses:

FieldAbstractAnalyticalPropagator, FieldAbstractIntegratedPropagator

public abstract class FieldAbstractPropagator<T extends CalculusFieldElement<T>>
extends Object
implements FieldPropagator<T>

Common handling of Propagator methods for analytical propagators.

This abstract class allows to provide easily the full set of Propagator methods, including all propagation modes support and discrete events support for any simple propagation method.

Author:

Luc Maisonobe

Field Summary

Fields inherited from interface org.orekit.propagation.FieldPropagator

DEFAULT_MASS

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	FieldAbstractPropagator(Field<T> field)	Build a new instance.

Method Summary

Modifier and Type	Method	Description
void	addAdditionalDataProvider(FieldAdditionalDataProvider<?,T> additionalDataProvider)	Add a set of user-specified data to be computed along with the orbit propagation.
List<FieldAdditionalDataProvider<?,T>>	getAdditionalDataProviders()	Get an unmodifiable list of providers for additional data.
AttitudeProvider	getAttitudeProvider()	Get attitude provider.
Field<T>	getField()	Field getter.
Frame	getFrame()	Get the frame in which the orbit is propagated.
FieldSpacecraftState<T>	getInitialState()	Get the propagator initial state.
String[]	getManagedAdditionalData()	Get all the names of all managed data.
FieldStepHandlerMultiplexer<T>	getMultiplexer()	Get the multiplexer holding all step handlers.
protected FieldAbsoluteDate<T>	getStartDate()	Get the start date.
protected void	initializeAdditionalData(FieldAbsoluteDate<T> target)	Initialize the additional data providers at the start of propagation.
protected void	initializePropagation()	Initialize propagation.
boolean	isAdditionalDataManaged(String name)	Check if an additional data is managed.
FieldSpacecraftState<T>	propagate(FieldAbsoluteDate<T> target)	Propagate towards a target date.
void	removeAdditionalDataProvider(String name)	Remove an additional data provider.
void	resetInitialState(FieldSpacecraftState<T> state)	Reset the propagator initial state.
void	setAttitudeProvider(AttitudeProvider attitudeProvider)	Set attitude provider.
protected void	setStartDate(FieldAbsoluteDate<T> startDate)	Set a start date.
protected void	stateChanged(FieldSpacecraftState<T> state)	Notify about a state change.
FieldSpacecraftState<T>	updateAdditionalData(FieldSpacecraftState<T> original)	Update state by adding all additional data.
protected FieldSpacecraftState<T>	updateUnmanagedData(FieldSpacecraftState<T> original)	Update state by adding unmanaged states.

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.FieldPropagator

addEventDetector, clearEventsDetectors, clearStepHandlers, getEphemerisGenerator, getEventDetectors, getPosition, getPVCoordinates, getVelocity, propagate, setStepHandler, setStepHandler

Constructor Details

FieldAbstractPropagator

protected FieldAbstractPropagator(Field<T> field)

Build a new instance.

Parameters:

field - setting the field

Method Details

setStartDate

protected void setStartDate(FieldAbsoluteDate<T> startDate)

Set a start date.

Parameters:

startDate - start date

getStartDate

protected FieldAbsoluteDate<T> getStartDate()

Get the start date.

Returns:

start date

getAttitudeProvider

public AttitudeProvider getAttitudeProvider()

Get attitude provider.

Specified by:

getAttitudeProvider in interface FieldPropagator<T extends CalculusFieldElement<T>>

Returns:

attitude provider

setAttitudeProvider

public void setAttitudeProvider(AttitudeProvider attitudeProvider)

Set attitude provider.

Specified by:

setAttitudeProvider in interface FieldPropagator<T extends CalculusFieldElement<T>>

Parameters:

attitudeProvider - attitude provider

getField

public Field<T> getField()

Field getter.

Returns:

field used

getInitialState

public FieldSpacecraftState<T> getInitialState()

Get the propagator initial state.

Specified by:

getInitialState in interface FieldPropagator<T extends CalculusFieldElement<T>>

Returns:

initial state

getFrame

public Frame getFrame()

Get the frame in which the orbit is propagated.

The propagation frame is the definition frame of the initial state, so this method should be called after this state has been set, otherwise it may return null.

Specified by:

getFrame in interface FieldPropagator<T extends CalculusFieldElement<T>>

Returns:

frame in which the orbit is propagated

See Also:

• FieldPropagator.resetInitialState(FieldSpacecraftState)

resetInitialState

public void resetInitialState(FieldSpacecraftState<T> state)

Reset the propagator initial state.

Specified by:

resetInitialState in interface FieldPropagator<T extends CalculusFieldElement<T>>

Parameters:

state - new initial state to consider

getMultiplexer

public FieldStepHandlerMultiplexer<T> getMultiplexer()

Get the multiplexer holding all step handlers.

Specified by:

getMultiplexer in interface FieldPropagator<T extends CalculusFieldElement<T>>

Returns:

multiplexer holding all step handlers

addAdditionalDataProvider

public void addAdditionalDataProvider(FieldAdditionalDataProvider<?,T> additionalDataProvider)

Add a set of user-specified data to be computed along with the orbit propagation.

Specified by:

addAdditionalDataProvider in interface FieldPropagator<T extends CalculusFieldElement<T>>

Parameters:

additionalDataProvider - provider for additional data

getAdditionalDataProviders

public List<FieldAdditionalDataProvider<?,T>> getAdditionalDataProviders()

Get an unmodifiable list of providers for additional data.

Specified by:

getAdditionalDataProviders in interface FieldPropagator<T extends CalculusFieldElement<T>>

Returns:

providers for the additional states

removeAdditionalDataProvider

public void removeAdditionalDataProvider(String name)

Remove an additional data provider.

Parameters:

name - data name

Since:

13.1

updateUnmanagedData

protected FieldSpacecraftState<T> updateUnmanagedData(FieldSpacecraftState<T> original)

Update state by adding unmanaged states.

Parameters:

original - original state

Returns:

updated state, with unmanaged states included

See Also:

• updateAdditionalData(FieldSpacecraftState)

updateAdditionalData

public FieldSpacecraftState<T> updateAdditionalData(FieldSpacecraftState<T> original)

Update state by adding all additional data.

Parameters:

original - original state

Returns:

updated state, with all additional data included

See Also:

• addAdditionalDataProvider(FieldAdditionalDataProvider)

initializeAdditionalData

protected void initializeAdditionalData(FieldAbsoluteDate<T> target)

Initialize the additional data providers at the start of propagation.

Parameters:

target - date of propagation. Not equal to initialState.getDate().

Since:

11.2

isAdditionalDataManaged

public boolean isAdditionalDataManaged(String name)

Check if an additional data is managed.

Managed data are the ones for which the propagators know how to compute its evolution. They correspond to additional data for which an additional data provider has been registered by calling the addAdditionalDataProvider method. If the propagator is an integrator-based propagator, the states for which a set of additional derivatives provider has been registered by calling the addAdditionalDerivativesProvider method are also counted as managed additional states.

Additional data that are present in the initial state but have no evolution method registered are not considered as managed data. These unmanaged additional data are not lost during propagation, though. Their value are piecewise constant between state resets that may change them if some event handler resetState method is called at an event occurrence and happens to change the unmanaged additional data.

Specified by:

isAdditionalDataManaged in interface FieldPropagator<T extends CalculusFieldElement<T>>

Parameters:

name - name of the additional data

Returns:

true if the additional data is managed

getManagedAdditionalData

public String[] getManagedAdditionalData()

Get all the names of all managed data.

Specified by:

getManagedAdditionalData in interface FieldPropagator<T extends CalculusFieldElement<T>>

Returns:

names of all managed data

propagate

public FieldSpacecraftState<T> propagate(FieldAbsoluteDate<T> target)

Propagate towards a target date.

Simple propagators use only the target date as the specification for computing the propagated state. More feature rich propagators can consider other information and provide different operating modes or G-stop facilities to stop at pinpointed events occurrences. In these cases, the target date is only a hint, not a mandatory objective.

Specified by:

propagate in interface FieldPropagator<T extends CalculusFieldElement<T>>

Parameters:

target - target date towards which orbit state should be propagated

Returns:

propagated state

initializePropagation

protected void initializePropagation()

Initialize propagation.

Since:

10.1

stateChanged

protected void stateChanged(FieldSpacecraftState<T> state)

Notify about a state change.

Parameters:

state - new state