fr.cnes.sirius.patrius.propagation.events

Class NadirSolarIncidenceDetector

java.lang.Object

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

fr.cnes.sirius.patrius.propagation.events.NadirSolarIncidenceDetector

All Implemented Interfaces:

EventDetector, Serializable

public class NadirSolarIncidenceDetector
extends AbstractDetector

Spacecraft's nadir point solar incidence detector.

The solar incidence is the angle between the nadir-satellite vector and the nadir-sun vector.
This detector does not discriminate among increasing g events and decreasing g events: every detected event is a solar incidence crossing event.
The default implementation is to stop propagation when the reference solar incidence is reached. This can be changed by using 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:

1.1

Version:

$Id: NadirSolarIncidenceDetector.java 17582 2017-05-10 12:58:16Z bignon $

Author:

Thomas Trapier

See Also:

EventDetector, Serialized Form

Concurrency :

thread-hostile

Concurrency comment :

the earth celestial body is thread hostile itself.

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
NadirSolarIncidenceDetector(double incidence, BodyShape earth, double maxCheck, double threshold) Constructor for the nadir point solar incidence detector
NadirSolarIncidenceDetector(double incidence, BodyShape earth, double maxCheck, double threshold, EventDetector.Action action) Constructor for the nadir point solar incidence detector
NadirSolarIncidenceDetector(double incidence, BodyShape earth, double maxCheck, double threshold, EventDetector.Action action, boolean remove) Constructor for the nadir point solar incidence detector
NadirSolarIncidenceDetector(double incidence, BodyShape earth, double maxCheck, double threshold, EventDetector.Action action, boolean remove, CelestialBody sun) Constructor for the nadir point solar incidence detector with Sun choice.

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 solar incidence event and choose what to do next.
double	g(SpacecraftState state) Compute the value of the switching function.
BodyShape	getEarthShape() Returns Earth shape.
double	getIncidence() Returns incidence.
PVCoordinatesProvider	getSun() Returns Sun.
void	init(SpacecraftState s0, AbsoluteDate t) Initialize event handler at the start of a propagation.
void	setPropagationDelayType(AbstractDetector.PropagationDelayType propagationDelayType, Frame frame) Setter for propagation delay computation type.
void	setSun(PVCoordinatesProvider sun) Sets the sun PVCoordinatesProvider

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, setMaxCheckInterval, shouldBeRemoved

Methods inherited from class java.lang.Object

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

Constructor Detail

NadirSolarIncidenceDetector

public NadirSolarIncidenceDetector(double incidence,
                                   BodyShape earth,
                                   double maxCheck,
                                   double threshold)
                            throws PatriusException

Constructor for the nadir point solar incidence detector

The default implementation behavior is to stop propagation when the local time is reached.

Parameters:

incidence - the incidence to detect (set 0. to detect the terminator)

earth - the earth shape

maxCheck - maximum check (see AbstractDetector)

threshold - threshold (see AbstractDetector)

Throws:

PatriusException - error when loading the ephemeris files

NadirSolarIncidenceDetector

public NadirSolarIncidenceDetector(double incidence,
                                   BodyShape earth,
                                   double maxCheck,
                                   double threshold,
                                   EventDetector.Action action)
                            throws PatriusException

Constructor for the nadir point solar incidence detector

Parameters:

incidence - the incidence to detect (set 0. to detect the terminator)

earth - the earth shape

maxCheck - maximum check (see AbstractDetector)

threshold - threshold (see AbstractDetector)

action - action performed at nadir point solar incidence detection

Throws:

PatriusException - error when loading the ephemeris files

NadirSolarIncidenceDetector

public NadirSolarIncidenceDetector(double incidence,
                                   BodyShape earth,
                                   double maxCheck,
                                   double threshold,
                                   EventDetector.Action action,
                                   boolean remove)
                            throws PatriusException

Constructor for the nadir point solar incidence detector

Parameters:

incidence - the incidence to detect (set 0. to detect the terminator)

earth - the earth shape

maxCheck - maximum check (see AbstractDetector)

threshold - threshold (see AbstractDetector)

action - action performed at nadir point solar incidence detection

remove - true if detector should be removed at nadir point solar incidence detection

Throws:

PatriusException - error when loading the ephemeris files

Since:

3.1

NadirSolarIncidenceDetector

public NadirSolarIncidenceDetector(double incidence,
                                   BodyShape earth,
                                   double maxCheck,
                                   double threshold,
                                   EventDetector.Action action,
                                   boolean remove,
                                   CelestialBody sun)
                            throws PatriusException

Constructor for the nadir point solar incidence detector with Sun choice.

Parameters:

incidence - the incidence to detect (set 0. to detect the terminator)

earth - the earth shape

maxCheck - maximum check (see AbstractDetector)

threshold - threshold (see AbstractDetector)

action - action performed at nadir point solar incidence detection

remove - true if detector should be removed at nadir point solar incidence detection

sun - Sun

Throws:

PatriusException - error when loading the ephemeris files

Since:

4.5

Method Detail

g

public double g(SpacecraftState state)
         throws PatriusException

Compute the value of the switching function. This function must be continuous (at least in its roots neighborhood), as the integrator will need to find its roots to locate the events.

Specified by:

g in interface EventDetector

Specified by:

g in class AbstractDetector

Parameters:

state - the current state information: date, kinematics, attitude for forces and events computation, mass provider, and additional states

Returns:

value of the switching function

Throws:

PatriusException - if some specific error occurs

eventOccurred

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

Handle a solar incidence event and choose what to do next.

Specified by:

eventOccurred in interface EventDetector

Overrides:

eventOccurred in class AbstractDetector

Parameters:

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

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

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

Returns:

the action performed when the expected nadir point solar incidence is detected

Throws:

PatriusException - if some specific error occurs

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

setSun

public void setSun(PVCoordinatesProvider sun)

Sets the sun PVCoordinatesProvider

Parameters:

sun - the sun

getSun

public PVCoordinatesProvider getSun()

Returns Sun.

Returns:

the Sun

getEarthShape

public BodyShape getEarthShape()

Returns Earth shape.

Returns:

the earth shape

getIncidence

public double getIncidence()

Returns incidence.

Returns:

incidence to detect

setPropagationDelayType

public void setPropagationDelayType(AbstractDetector.PropagationDelayType propagationDelayType,
                                    Frame frame)

Description copied from class: AbstractDetector

Setter for propagation delay computation type. Warning: check Javadoc of detector to see if detector takes into account propagation time delay. if not, signals are always considered instantaneous. The provided frame is used to compute the signal propagation when delay is taken into account.

Overrides:

setPropagationDelayType in class AbstractDetector

Parameters:

propagationDelayType - propagation delay type used in events computation

frame - frame to use for signal propagation with delay (may be null if propagation delay type is considered instantaneous). Warning: the usage of a pseudo inertial frame is tolerated, however it will lead to some inaccuracies due to the non-invariance of the frame with respect to time. For this reason, it is suggested to use the ICRF frame or a frame which is frozen with respect to the ICRF.

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:

• inEarth: PVCoordinatesProvider

Returns:

a copy of the detector.