Class FieldOfViewDetector
- java.lang.Object
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- org.orekit.propagation.events.AbstractDetector<FieldOfViewDetector>
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- org.orekit.propagation.events.FieldOfViewDetector
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- All Implemented Interfaces:
EventDetector
public class FieldOfViewDetector extends AbstractDetector<FieldOfViewDetector>
Finder for target entry/exit events with respect to a satellite sensorField Of View
.Beware that this detector is unaware of any bodies occluding line-of-sight to the target. It can be therefore used for many contexts from Earth Observation to interplanetary mission design. For instance, in an Earth Observation context, it can be easily combined to an
ElevationDetector
usingBooleanDetector.andCombine(java.util.Collection)
to calculate station visibility opportunities within the satellite's field of view.The default implementation behavior is to
continue
propagation at FOV entry and tostop
propagation at FOV exit. This can be changed by callingAbstractDetector.withHandler(EventHandler)
after construction.- Since:
- 7.1
- Author:
- Luc Maisonobe
- See Also:
Propagator.addEventDetector(EventDetector)
,FootprintOverlapDetector
,VisibilityTrigger
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Field Summary
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Fields inherited from class org.orekit.propagation.events.AbstractDetector
DEFAULT_MAX_ITER, DEFAULT_MAXCHECK, DEFAULT_THRESHOLD
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Constructor Summary
Constructors Modifier Constructor Description protected
FieldOfViewDetector(AdaptableInterval maxCheck, double threshold, int maxIter, EventHandler handler, PVCoordinatesProvider pvTarget, double radiusTarget, VisibilityTrigger trigger, FieldOfView fov)
Protected constructor with full parameters.FieldOfViewDetector(PVCoordinatesProvider pvTarget, double radiusTarget, VisibilityTrigger trigger, FieldOfView fov)
Build a new instance.FieldOfViewDetector(PVCoordinatesProvider pvTarget, FieldOfView fov)
Build a new instance.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected FieldOfViewDetector
create(AdaptableInterval newMaxCheck, double newThreshold, int newMaxIter, EventHandler newHandler)
Build a new instance.double
g(SpacecraftState s)
Compute the value of the switching function.FieldOfView
getFOV()
Get the Field Of View.PVCoordinatesProvider
getPVTarget()
Get the position/velocity provider of the target .-
Methods inherited from class org.orekit.propagation.events.AbstractDetector
create, getDetectionSettings, getHandler, getMaxCheckInterval, getMaxIterationCount, getThreshold, init, isForward, withDetectionSettings, withHandler, withMaxCheck, withMaxCheck, withMaxIter, withThreshold
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Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Methods inherited from interface org.orekit.propagation.events.EventDetector
finish
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Constructor Detail
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FieldOfViewDetector
public FieldOfViewDetector(PVCoordinatesProvider pvTarget, FieldOfView fov)
Build a new instance.The maximal interval between distance to FOV boundary checks should be smaller than the half duration of the minimal pass to handle, otherwise some short passes could be missed.
- Parameters:
pvTarget
- Position/velocity provider of the considered targetfov
- Field Of View- Since:
- 10.1
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FieldOfViewDetector
public FieldOfViewDetector(PVCoordinatesProvider pvTarget, double radiusTarget, VisibilityTrigger trigger, FieldOfView fov)
Build a new instance.The maximal interval between distance to FOV boundary checks should be smaller than the half duration of the minimal pass to handle, otherwise some short passes could be missed.
- Parameters:
pvTarget
- Position/velocity provider of the considered targetradiusTarget
- radius of the target, considered to be a spherical body (m)trigger
- visibility trigger for spherical bodiesfov
- Field Of View- Since:
- 10.1
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FieldOfViewDetector
protected FieldOfViewDetector(AdaptableInterval maxCheck, double threshold, int maxIter, EventHandler handler, PVCoordinatesProvider pvTarget, double radiusTarget, VisibilityTrigger trigger, FieldOfView fov)
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 intervalthreshold
- convergence threshold (s)maxIter
- maximum number of iterations in the event time searchhandler
- event handler to call at event occurrencespvTarget
- Position/velocity provider of the considered targetradiusTarget
- radius of the target, considered to be a spherical body (m)trigger
- visibility trigger for spherical bodiesfov
- Field Of View
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Method Detail
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create
protected FieldOfViewDetector create(AdaptableInterval newMaxCheck, double newThreshold, int newMaxIter, EventHandler newHandler)
Build a new instance.- Specified by:
create
in classAbstractDetector<FieldOfViewDetector>
- Parameters:
newMaxCheck
- maximum checking interval (s)newThreshold
- convergence threshold (s)newMaxIter
- maximum number of iterations in the event time searchnewHandler
- event handler to call at event occurrences- Returns:
- a new instance of the appropriate sub-type
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getPVTarget
public PVCoordinatesProvider getPVTarget()
Get the position/velocity provider of the target .- Returns:
- the position/velocity provider of the target
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getFOV
public FieldOfView getFOV()
Get the Field Of View.- Returns:
- Field Of View
- Since:
- 10.1
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g
public double g(SpacecraftState s)
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.The g function value is the angular offset between the target center and the
Field Of View boundary
, plus or minus the target angular radius depending on theVisibilityTrigger
, minus theField Of View margin
. It is therefore negative if the target is visible within the Field Of View and positive if it is outside of the Field Of View.As per the previous definition, when the target enters the Field Of View, a decreasing event is generated, and when the target leaves the Field Of View, an increasing event is generated.
- Parameters:
s
- the current state information: date, kinematics, attitude- Returns:
- value of the switching function
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