fr.cnes.sirius.patrius.events

Class CentralBodyMaskCircularFOVDetector

java.lang.Object

fr.cnes.sirius.patrius.propagation.events.AbstractDetector

fr.cnes.sirius.patrius.events.CentralBodyMaskCircularFOVDetector

All Implemented Interfaces:

EventDetector, Serializable

public class CentralBodyMaskCircularFOVDetector
extends AbstractDetector

Finder for target entry/exit events with respect to a satellite sensor FOV defined by a vector3D giving the direction in satellite frame and taking into account masking from the central body

This class handles fields of view with a circular boundary.

This class handles central body as a ellipsoid.

The default implementation behaviour is to stop propagation when the target is in the field of view outside of eclipse. This can be changed by using one of the provided constructors.

This detector can takes into account signal propagation duration through AbstractDetector.setPropagationDelayType(PropagationDelayType, fr.cnes.sirius.patrius.frames.Frame) (default is signal being instantaneous).

Since:

1.3

Version:

$Id$

Author:

chabaudp

See Also:

Propagator.addEventDetector(fr.cnes.sirius.patrius.propagation.events.EventDetector), BodyShape, IEllipsoid, EclipseDetector, CircularFieldOfViewDetector, Serialized Form

Concurrency :

not thread-safe

Concurrency comment :

one attribute not thread-safe and one conditionally thread-safe

Nested Class Summary

Nested classes/interfaces inherited from class fr.cnes.sirius.patrius.propagation.events.AbstractDetector

AbstractDetector.PropagationDelayType

Nested classes/interfaces inherited from interface fr.cnes.sirius.patrius.propagation.events.EventDetector

EventDetector.Action

Field Summary

Fields inherited from class fr.cnes.sirius.patrius.propagation.events.AbstractDetector

actionAtEntry, actionAtExit, DEFAULT_MAXCHECK, DEFAULT_THRESHOLD, removeAtEntry, removeAtExit, shouldBeRemovedFlag

Fields inherited from interface fr.cnes.sirius.patrius.propagation.events.EventDetector

DECREASING, INCREASING, INCREASING_DECREASING

Constructor Summary

Constructors

Constructor and Description
CentralBodyMaskCircularFOVDetector(EclipseDetector eclipseDetectorIn, CircularFieldOfViewDetector circularFOVDetectorIn, double maxCheck, double threshold, EventDetector.Action action, boolean remove) Constructor with EclipseDetector and CircularFieldOfViewDetector.
CentralBodyMaskCircularFOVDetector(PVCoordinatesProvider occultedBody, double occultedBodyRadius, BodyShape occultingBody, boolean totalEclipseFlag, Vector3D center, double halfAperture) Constructor with default maxcheck and default threshold, creating a circularFOVDetector and an EllipsoidEclipseDetector
CentralBodyMaskCircularFOVDetector(PVCoordinatesProvider occultedBody, double occultedBodyRadius, BodyShape occultingBody, boolean totalEclipseFlag, Vector3D center, double halfAperture, double maxCheck, double threshold) Constructor with user maxcheck and threshold creating a circularFOVDetector and an EllipsoidEclipseDetector
CentralBodyMaskCircularFOVDetector(PVCoordinatesProvider occultedBody, double occultedBodyRadius, BodyShape occultingBody, boolean totalEclipseFlag, Vector3D center, double halfAperture, double maxCheck, double threshold, EventDetector.Action action) Constructor with user maxcheck and threshold creating a circularFOVDetector and an EllipsoidEclipseDetector
CentralBodyMaskCircularFOVDetector(PVCoordinatesProvider occultedBody, double occultedBodyRadius, BodyShape occultingBody, boolean totalEclipseFlag, Vector3D center, double halfAperture, double maxCheck, double threshold, EventDetector.Action action, boolean remove) Constructor with user maxcheck and threshold creating a circularFOVDetector and an EllipsoidEclipseDetector

Method Summary

Modifier and Type	Method and Description
EventDetector	copy() A copy of the detector.
EventDetector.Action	eventOccurred(SpacecraftState s, boolean increasing, boolean forward) Handle a target in field of view outside eclipse reaching event and choose what to do next.
double	g(SpacecraftState s) The switching function is the minimum value between the eclipse detector g function and the circularFOVDetector
CircularFieldOfViewDetector	getCircularFOVDetector() Get the circular FOV detector.
EclipseDetector	getEclipseDetector() Get the eclipse detector.
void	init(SpacecraftState s0, AbsoluteDate t) Initialize event handler at the start of a propagation.

Methods inherited from class fr.cnes.sirius.patrius.propagation.events.AbstractDetector

getActionAtEntry, getActionAtExit, getInertialFrame, getMaxCheckInterval, getMaxIterationCount, getPropagationDelayType, getSignalEmissionDate, getSignalReceptionDate, getSlopeSelection, getThreshold, isRemoveAtEntry, isRemoveAtExit, logEventsOverTimeInterval, resetState, setEpsilonSignalPropagation, setMaxCheckInterval, setMaxIterSignalPropagation, setPropagationDelayType, shouldBeRemoved

Methods inherited from class java.lang.Object

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

Constructor Detail

CentralBodyMaskCircularFOVDetector

public CentralBodyMaskCircularFOVDetector(PVCoordinatesProvider occultedBody,
                                          double occultedBodyRadius,
                                          BodyShape occultingBody,
                                          boolean totalEclipseFlag,
                                          Vector3D center,
                                          double halfAperture,
                                          double maxCheck,
                                          double threshold)

Constructor with user maxcheck and threshold creating a circularFOVDetector and an EllipsoidEclipseDetector

The default implementation behaviour is to stop propagation when the target is visible.

Parameters:

occultedBody - the target to detect in field of view outside of eclipse

occultedBodyRadius - the radius of this target

occultingBody - the ellipsoid body shape of the central body potentially occulting the target

totalEclipseFlag - true to detect only when the target is fully visible, false to detect also when the target is partially visible

center - the sight axis direction of the field of view in satellite frame

halfAperture - the half aperture of the field of view

maxCheck - maximum check (see AbstractDetector)

threshold - threshold (see AbstractDetector)

Since:

1.3

See Also:

EclipseDetector, CircularFieldOfViewDetector

CentralBodyMaskCircularFOVDetector

public CentralBodyMaskCircularFOVDetector(PVCoordinatesProvider occultedBody,
                                          double occultedBodyRadius,
                                          BodyShape occultingBody,
                                          boolean totalEclipseFlag,
                                          Vector3D center,
                                          double halfAperture,
                                          double maxCheck,
                                          double threshold,
                                          EventDetector.Action action)

Constructor with user maxcheck and threshold creating a circularFOVDetector and an EllipsoidEclipseDetector

Parameters:

occultedBody - the target to detect in field of view outside of eclipse

occultedBodyRadius - the radius of this target

occultingBody - the ellipsoid body shape of the central body potentially occulting the target

totalEclipseFlag - true to detect only when the target is fully visible, false to detect also when the target is partially visible

center - the sight axis direction of the field of view in satellite frame

halfAperture - the half aperture of the field of view

maxCheck - maximum check (see AbstractDetector)

threshold - threshold (see AbstractDetector)

action - action performed at circularFOV detection

Since:

1.3

See Also:

EclipseDetector, CircularFieldOfViewDetector

CentralBodyMaskCircularFOVDetector

public CentralBodyMaskCircularFOVDetector(PVCoordinatesProvider occultedBody,
                                          double occultedBodyRadius,
                                          BodyShape occultingBody,
                                          boolean totalEclipseFlag,
                                          Vector3D center,
                                          double halfAperture,
                                          double maxCheck,
                                          double threshold,
                                          EventDetector.Action action,
                                          boolean remove)

Constructor with user maxcheck and threshold creating a circularFOVDetector and an EllipsoidEclipseDetector

Parameters:

occultedBody - the target to detect in field of view outside of eclipse

occultedBodyRadius - the radius of this target

occultingBody - the ellipsoid body shape of the central body potentially occulting the target

totalEclipseFlag - true to detect only when the target is fully visible, false to detect also when the target is partially visible

center - the sight axis direction of the field of view in satellite frame

halfAperture - the half aperture of the field of view

maxCheck - maximum check (see AbstractDetector)

threshold - threshold (see AbstractDetector)

action - action performed at circularFOV detection

remove - if detector should be removed

Since:

3.1

See Also:

EclipseDetector, CircularFieldOfViewDetector

CentralBodyMaskCircularFOVDetector

public CentralBodyMaskCircularFOVDetector(EclipseDetector eclipseDetectorIn,
                                          CircularFieldOfViewDetector circularFOVDetectorIn,
                                          double maxCheck,
                                          double threshold,
                                          EventDetector.Action action,
                                          boolean remove)

Constructor with EclipseDetector and CircularFieldOfViewDetector.

Parameters:

eclipseDetectorIn - Eclipse detector

circularFOVDetectorIn - circular field of view

maxCheck - maximum check (see AbstractDetector)

threshold - threshold (see AbstractDetector)

action - action performed at circularFOV detection

remove - if detector should be removed

Since:

3.1

See Also:

EclipseDetector, CircularFieldOfViewDetector

CentralBodyMaskCircularFOVDetector

public CentralBodyMaskCircularFOVDetector(PVCoordinatesProvider occultedBody,
                                          double occultedBodyRadius,
                                          BodyShape occultingBody,
                                          boolean totalEclipseFlag,
                                          Vector3D center,
                                          double halfAperture)

Constructor with default maxcheck and default threshold, creating a circularFOVDetector and an EllipsoidEclipseDetector

Parameters:

occultedBody - the target to detect in field of view outside of eclipse

occultedBodyRadius - the radius of this target

occultingBody - the ellipsoid body shape of the central body potentially occulting the target

totalEclipseFlag - true to detect only when the target is fully visible, false to detect also when the target is partially visible

center - the sight axis direction of the field of view in satellite frame

halfAperture - the half aperture of the field of view

Since:

1.3

See Also:

EclipseDetector, CircularFieldOfViewDetector

Method Detail

init

public void init(SpacecraftState s0,
                 AbsoluteDate t)

Initialize event handler at the start of a propagation.

This method is called once at the start of the propagation. It may be used by the event handler to initialize some internal data if needed.

Specified by:

init in interface EventDetector

Overrides:

init in class AbstractDetector

Parameters:

s0 - initial state

t - target time for the integration

eventOccurred

public EventDetector.Action eventOccurred(SpacecraftState s,
                                          boolean increasing,
                                          boolean forward)
                                   throws PatriusException

Handle a target in field of view outside eclipse reaching event and choose what to do next.

Specified by:

eventOccurred in interface EventDetector

Overrides:

eventOccurred in class AbstractDetector

Parameters:

s - the current state of propagation

increasing - if true, the value of the switching function increases when times increases around event

forward - if true, the integration variable (time) increases during integration.

Returns:

the action performed when the expected circularFOV is reached

Throws:

PatriusException - if some specific error occurs

g

public double g(SpacecraftState s)
         throws PatriusException

The switching function is the minimum value between the eclipse detector g function and the circularFOVDetector

Specified by:

g in interface EventDetector

Specified by:

g in class AbstractDetector

Parameters:

s - the current state of propagation

Returns:

value of the switching function

Throws:

PatriusException - if some specific error occurs

getEclipseDetector

public EclipseDetector getEclipseDetector()

Get the eclipse detector.

Returns:

the eclipse detector taking into account ellipsoid body shape

getCircularFOVDetector

public CircularFieldOfViewDetector getCircularFOVDetector()

Get the circular FOV detector.

Returns:

The circular field of view detector

copy

public EventDetector copy()

A copy of the detector. By default copy is deep. If not, detector javadoc will specify which attribute is not fully copied. In that case, the attribute reference is passed.

The following attributes are not deeply copied:

• circularFOVDetector: CircularFieldOfViewDetector

Returns:

a copy of the detector.