Package org.orekit.propagation.events

Class FieldRelativeDistanceDetector<T extends CalculusFieldElement<T>>

java.lang.Object

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

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

All Implemented Interfaces:

FieldEventDetector<T>

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

Detector of specific value for the distance relative to another trajectory (using the Euclidean norm).

The default implementation behavior is to stop propagation. This can be changed by calling FieldAbstractDetector.withHandler(org.orekit.propagation.events.handlers.FieldEventHandler) after construction.

As this detector needs two objects (moving relative to each other), it embeds one coordinates provider for the secondary object and is registered as an event detector in the propagator of the primary object. The secondary object coordinates provider will therefore be driven by this detector (and hence by the propagator in which this detector is registered).

For efficiency reason during the event search loop, it is recommended to have the secondary provider be an analytical propagator or an ephemeris. A numerical propagator as a secondary propagator works but is expected to be computationally costly.

Since:

12.1

Author:

Romain Serra

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
protected	FieldRelativeDistanceDetector(FieldAdaptableInterval<T> maxCheck, T threshold, int maxIter, FieldEventHandler<T> handler, FieldPVCoordinatesProvider<T> secondaryPVProvider, T distanceThreshold)	Constructor.
	FieldRelativeDistanceDetector(FieldPVCoordinatesProvider<T> secondaryPVProvider, T distanceThreshold)	Constructor with default values.

Method Summary

Modifier and Type	Method	Description
protected FieldRelativeDistanceDetector<T>	create(FieldAdaptableInterval<T> newMaxCheck, T newThreshold, int newMaxIter, FieldEventHandler<T> newHandler)	Build a new instance.
T	g(FieldSpacecraftState<T> s)	The g is positive when the relative distance is larger or equal than the threshold, non-positive otherwise.
T	getDistanceThreshold()	Get the relative distance threshold.
FieldPVCoordinatesProvider<T>	getSecondaryPVProvider()	Get the secondary position-velocity provider stored in this instance.

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

FieldRelativeDistanceDetector

public FieldRelativeDistanceDetector(FieldPVCoordinatesProvider<T> secondaryPVProvider,
                                     T distanceThreshold)

Constructor with default values.

By default, the implemented behavior is to stop propagation at detection.

Parameters:

secondaryPVProvider - PVCoordinates provider of the other object defining relative distance.

distanceThreshold - Relative distance threshold for event detection

FieldRelativeDistanceDetector

protected FieldRelativeDistanceDetector(FieldAdaptableInterval<T> maxCheck,
                                        T threshold,
                                        int maxIter,
                                        FieldEventHandler<T> handler,
                                        FieldPVCoordinatesProvider<T> secondaryPVProvider,
                                        T distanceThreshold)

Constructor.

This constructor is to be used if the user wants to change the default behavior of the detector.

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.

secondaryPVProvider - PVCoordinates provider of the other object defining relative distance.

distanceThreshold - Relative distance threshold for event detection

See Also:

FieldEventHandler

Method Detail

g

public T g(FieldSpacecraftState<T> s)

The g is positive when the relative distance is larger or equal than the threshold, non-positive otherwise.

Specified by:

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

Specified by:

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

Parameters:

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

Returns:

value of the switching function

create

protected FieldRelativeDistanceDetector<T> create(FieldAdaptableInterval<T> newMaxCheck,
                                                  T newThreshold,
                                                  int newMaxIter,
                                                  FieldEventHandler<T> newHandler)

Build a new instance.

Specified by:

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

Parameters:

newMaxCheck - maximum checking interval

newThreshold - convergence threshold (s)

newMaxIter - 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

getSecondaryPVProvider

public FieldPVCoordinatesProvider<T> getSecondaryPVProvider()

Get the secondary position-velocity provider stored in this instance.

Returns:

the secondary position-velocity provider stored in this instance

getDistanceThreshold

public T getDistanceThreshold()

Get the relative distance threshold.

Returns:

threshold triggering detection