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	addAdditionalStateProvider(FieldAdditionalStateProvider<T> additionalStateProvider)	Add a set of user-specified state parameters to be computed along with the orbit propagation.
List<FieldAdditionalStateProvider<T>>	getAdditionalStateProviders()	Get an unmodifiable list of providers for additional state.
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[]	getManagedAdditionalStates()	Get all the names of all managed states.
FieldStepHandlerMultiplexer<T>	getMultiplexer()	Get the multiplexer holding all step handlers.
TimeStampedFieldPVCoordinates<T>	getPVCoordinates(FieldAbsoluteDate<T> date, Frame frame)	Get the FieldPVCoordinates of the body in the selected frame.
protected FieldAbsoluteDate<T>	getStartDate()	Get the start date.
protected void	initializeAdditionalStates(FieldAbsoluteDate<T> target)	Initialize the additional state providers at the start of propagation.
protected void	initializePropagation()	Initialize propagation.
boolean	isAdditionalStateManaged(String name)	Check if an additional state is managed.
FieldSpacecraftState<T>	propagate(FieldAbsoluteDate<T> target)	Propagate towards a target date.
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.
protected FieldSpacecraftState<T>	updateAdditionalStates(FieldSpacecraftState<T> original)	Update state by adding all additional states.
protected FieldSpacecraftState<T>	updateUnmanagedStates(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, getEventsDetectors, propagate, setStepHandler, setStepHandler

Methods inherited from interface org.orekit.utils.FieldPVCoordinatesProvider

getPosition

Constructor Detail

FieldAbstractPropagator

protected FieldAbstractPropagator(Field<T> field)

Build a new instance.

Parameters:

field - setting the field

Method Detail

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

addAdditionalStateProvider

public void addAdditionalStateProvider(FieldAdditionalStateProvider<T> additionalStateProvider)

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

Specified by:

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

Parameters:

additionalStateProvider - provider for additional state

getAdditionalStateProviders

public List<FieldAdditionalStateProvider<T>> getAdditionalStateProviders()

Get an unmodifiable list of providers for additional state.

Specified by:

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

Returns:

providers for the additional states

updateUnmanagedStates

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

Update state by adding unmanaged states.

Parameters:

original - original state

Returns:

updated state, with unmanaged states included

See Also:

updateAdditionalStates(FieldSpacecraftState)

updateAdditionalStates

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

Update state by adding all additional states.

Parameters:

original - original state

Returns:

updated state, with all additional states included

See Also:

addAdditionalStateProvider(FieldAdditionalStateProvider)

initializeAdditionalStates

protected void initializeAdditionalStates(FieldAbsoluteDate<T> target)

Initialize the additional state providers at the start of propagation.

Parameters:

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

Since:

11.2

isAdditionalStateManaged

public boolean isAdditionalStateManaged(String name)

Check if an additional state is managed.

Managed states are states for which the propagators know how to compute its evolution. They correspond to additional states for which an additional state provider has been registered by calling the addAdditionalStateProvider 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 states that are present in the initial state but have no evolution method registered are not considered as managed states. These unmanaged additional states 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 state.

Specified by:

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

Parameters:

name - name of the additional state

Returns:

true if the additional state is managed

getManagedAdditionalStates

public String[] getManagedAdditionalStates()

Get all the names of all managed states.

Specified by:

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

Returns:

names of all managed states

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

getPVCoordinates

public TimeStampedFieldPVCoordinates<T> getPVCoordinates(FieldAbsoluteDate<T> date,
                                                         Frame frame)

Get the FieldPVCoordinates of the body in the selected frame.

Specified by:

getPVCoordinates in interface FieldPVCoordinatesProvider<T extends CalculusFieldElement<T>>

Parameters:

date - current date

frame - the frame where to define the position

Returns:

time-stamped position/velocity of the body (m and m/s)

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