Package org.orekit.propagation.events

Class FieldEclipseDetector<T extends CalculusFieldElement<T>>

java.lang.Object

org.orekit.propagation.events.FieldAbstractDetector<FieldEclipseDetector<T>,T>

org.orekit.propagation.events.FieldEclipseDetector<T>

Type Parameters:

T - the type of the field elements

All Implemented Interfaces:

FieldEventDetector<T>

public class FieldEclipseDetector<T extends CalculusFieldElement<T>>
extends FieldAbstractDetector<FieldEclipseDetector<T>,T>

Finder for satellite eclipse related events.

This class finds eclipse events, i.e. satellite within umbra (total eclipse) or penumbra (partial eclipse).

The default implementation behavior is to continue propagation when entering the eclipse and to stop propagation when exiting the eclipse. This can be changed by calling FieldAbstractDetector.withHandler(FieldEventHandler) after construction.

Author:

Pascal Parraud

See Also:

FieldPropagator.addEventDetector(FieldEventDetector)

Field Summary

Fields inherited from class org.orekit.propagation.events.FieldAbstractDetector

DEFAULT_MAX_ITER, DEFAULT_MAXCHECK, DEFAULT_THRESHOLD

Constructor Summary

Constructors

Modifier	Constructor	Description
	FieldEclipseDetector(Field<T> field, ExtendedPVCoordinatesProvider occulted, double occultedRadius, OneAxisEllipsoid occulting)	Build a new eclipse detector.
	FieldEclipseDetector(Field<T> field, OccultationEngine occultationEngine)	Build a new eclipse detector.
protected	FieldEclipseDetector(FieldAdaptableInterval<T> maxCheck, T threshold, int maxIter, FieldEventHandler<T> handler, OccultationEngine occultationEngine, T margin, boolean totalEclipse)	Protected constructor with full parameters.

Method Summary

Modifier and Type	Method	Description
protected FieldEclipseDetector<T>	create(FieldAdaptableInterval<T> newMaxCheck, T newThreshold, int nawMaxIter, FieldEventHandler<T> newHandler)	Build a new instance.
T	g(FieldSpacecraftState<T> s)	Compute the value of the switching function.
T	getMargin()	Get the angular margin used for eclipse detection.
OccultationEngine	getOccultationEngine()	Get the occultation engine.
boolean	getTotalEclipse()	Get the total eclipse detection flag.
FieldEclipseDetector<T>	withMargin(T newMargin)	Setup a margin to angle detection.
FieldEclipseDetector<T>	withPenumbra()	Setup the detector to penumbra detection.
FieldEclipseDetector<T>	withUmbra()	Setup the detector to full umbra detection.

Methods inherited from class org.orekit.propagation.events.FieldAbstractDetector

getHandler, getMaxCheckInterval, getMaxIterationCount, getThreshold, init, isForward, withHandler, withMaxCheck, withMaxCheck, withMaxIter, withThreshold

Methods inherited from class java.lang.Object

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

Constructor Detail

FieldEclipseDetector

public FieldEclipseDetector(Field<T> field,
                            ExtendedPVCoordinatesProvider occulted,
                            double occultedRadius,
                            OneAxisEllipsoid occulting)

Build a new eclipse detector.

The new instance is a total eclipse (umbra) detector with default values for maximal checking interval (FieldAbstractDetector.DEFAULT_MAXCHECK) and convergence threshold (FieldAbstractDetector.DEFAULT_THRESHOLD).

Parameters:

field - field used by default

occulted - the body to be occulted

occultedRadius - the radius of the body to be occulted (m)

occulting - the occulting body

Since:

12.0

FieldEclipseDetector

public FieldEclipseDetector(Field<T> field,
                            OccultationEngine occultationEngine)

Build a new eclipse detector.

The new instance is a total eclipse (umbra) detector with default values for maximal checking interval (FieldAbstractDetector.DEFAULT_MAXCHECK) and convergence threshold (FieldAbstractDetector.DEFAULT_THRESHOLD).

Parameters:

field - field used by default

occultationEngine - occultation engine

Since:

12.0

FieldEclipseDetector

protected FieldEclipseDetector(FieldAdaptableInterval<T> maxCheck,
                               T threshold,
                               int maxIter,
                               FieldEventHandler<T> handler,
                               OccultationEngine occultationEngine,
                               T margin,
                               boolean totalEclipse)

Protected constructor with full parameters.

This constructor is not public as users are expected to use the builder API with the various withXxx() methods to set up the instance in a readable manner without using a huge amount of parameters.

Parameters:

maxCheck - maximum checking interval

threshold - convergence threshold (s)

maxIter - maximum number of iterations in the event time search

handler - event handler to call at event occurrences

occultationEngine - occultation engine

margin - to apply to eclipse angle (rad)

totalEclipse - umbra (true) or penumbra (false) detection flag

Since:

12.0

Method Detail

create

protected FieldEclipseDetector<T> create(FieldAdaptableInterval<T> newMaxCheck,
                                         T newThreshold,
                                         int nawMaxIter,
                                         FieldEventHandler<T> newHandler)

Build a new instance.

Specified by:

create in class FieldAbstractDetector<FieldEclipseDetector<T extends CalculusFieldElement<T>>,T extends CalculusFieldElement<T>>

Parameters:

newMaxCheck - maximum checking interval

newThreshold - convergence threshold (s)

nawMaxIter - maximum number of iterations in the event time search

newHandler - event handler to call at event occurrences

Returns:

a new instance of the appropriate sub-type

withUmbra

public FieldEclipseDetector<T> withUmbra()

Setup the detector to full umbra detection.

This will override a penumbra/umbra flag if it has been configured previously.

Returns:

a new detector with updated configuration (the instance is not changed)

Since:

6.1

See Also:

withPenumbra()

withPenumbra

public FieldEclipseDetector<T> withPenumbra()

Setup the detector to penumbra detection.

This will override a penumbra/umbra flag if it has been configured previously.

Returns:

a new detector with updated configuration (the instance is not changed)

Since:

6.1

See Also:

withUmbra()

withMargin

public FieldEclipseDetector<T> withMargin(T newMargin)

Setup a margin to angle detection.

A positive margin implies eclipses are "larger" hence entry occurs earlier and exit occurs later than a detector with 0 margin.

Parameters:

newMargin - angular margin to apply to eclipse detection (rad)

Returns:

a new detector with updated configuration (the instance is not changed)

Since:

12.0

getMargin

public T getMargin()

Get the angular margin used for eclipse detection.

Returns:

angular margin used for eclipse detection (rad)

Since:

12.0

getOccultationEngine

public OccultationEngine getOccultationEngine()

Get the occultation engine.

Returns:

occultation engine

Since:

12.0

getTotalEclipse

public boolean getTotalEclipse()

Get the total eclipse detection flag.

Returns:

the total eclipse detection flag (true for umbra events detection, false for penumbra events detection)

g

public T g(FieldSpacecraftState<T> s)

Compute the value of the switching function. This function becomes negative when entering the region of shadow and positive when exiting.

Specified by:

g in interface FieldEventDetector<T extends CalculusFieldElement<T>>

Specified by:

g in class FieldAbstractDetector<FieldEclipseDetector<T extends CalculusFieldElement<T>>,T extends CalculusFieldElement<T>>

Parameters:

s - the current state information: date, kinematics, attitude

Returns:

value of the switching function