org.orekit.propagation.events

Class ParameterDrivenDateIntervalDetector

java.lang.Object

org.orekit.propagation.events.AbstractDetector<ParameterDrivenDateIntervalDetector>

org.orekit.propagation.events.ParameterDrivenDateIntervalDetector

All Implemented Interfaces:

EventDetector

public class ParameterDrivenDateIntervalDetector
extends AbstractDetector<ParameterDrivenDateIntervalDetector>

Detector for date intervals that may be offset thanks to parameter drivers.

Two dual views can be used for date intervals: either start date/stop date or median date/duration. start/stop drivers and median/duration drivers work in pair. Both drivers in one pair can be selected and their changes will be propagated to the other pair, but attempting to select drivers in both pairs at the same time will trigger an exception. Changing the value of a driver that is not selected should be avoided as it leads to inconsistencies between the pairs.

Since:

11.1

Author:

Luc Maisonobe

See Also:

Propagator.addEventDetector(EventDetector)

Field Summary

Fields

Modifier and Type	Field and Description
static String	DURATION_SUFFIX Default suffix for duration driver.
static String	MEDIAN_SUFFIX Default suffix for median driver.
static String	START_SUFFIX Default suffix for start driver.
static String	STOP_SUFFIX Default suffix for stop driver.

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

DEFAULT_MAX_ITER, DEFAULT_MAXCHECK, DEFAULT_THRESHOLD

Constructor Summary

Constructors

Constructor and Description
ParameterDrivenDateIntervalDetector(String prefix, AbsoluteDate refStart, AbsoluteDate refStop) Build a new instance.
ParameterDrivenDateIntervalDetector(String prefix, AbsoluteDate refMedian, double refDuration) Build a new instance.

Method Summary

Modifier and Type	Method and Description
protected ParameterDrivenDateIntervalDetector	create(double newMaxCheck, double newThreshold, int newMaxIter, EventHandler<? super ParameterDrivenDateIntervalDetector> newHandler) Build a new instance.
double	g(SpacecraftState s) Compute the value of the switching function.
ParameterDriver	getDurationDriver() Get the driver for duration.
DateDriver	getMedianDriver() Get the driver for median date.
DateDriver	getStartDriver() Get the driver for start date.
DateDriver	getStopDriver() Get the driver for stop date.

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

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

Methods inherited from class java.lang.Object

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

Field Detail

START_SUFFIX

public static final String START_SUFFIX

Default suffix for start driver.

See Also:

Constant Field Values

STOP_SUFFIX

public static final String STOP_SUFFIX

Default suffix for stop driver.

See Also:

Constant Field Values

MEDIAN_SUFFIX

public static final String MEDIAN_SUFFIX

Default suffix for median driver.

See Also:

Constant Field Values

DURATION_SUFFIX

public static final String DURATION_SUFFIX

Default suffix for duration driver.

See Also:

Constant Field Values

Constructor Detail

ParameterDrivenDateIntervalDetector

public ParameterDrivenDateIntervalDetector(String prefix,
                                           AbsoluteDate refMedian,
                                           double refDuration)

Build a new instance.

Parameters:

prefix - prefix to use for parameter drivers names

refMedian - reference interval median date

refDuration - reference duration

ParameterDrivenDateIntervalDetector

public ParameterDrivenDateIntervalDetector(String prefix,
                                           AbsoluteDate refStart,
                                           AbsoluteDate refStop)

Build a new instance.

Parameters:

prefix - prefix to use for parameter drivers names

refStart - reference interval start date

refStop - reference interval stop date

Method Detail

create

protected ParameterDrivenDateIntervalDetector create(double newMaxCheck,
                                                     double newThreshold,
                                                     int newMaxIter,
                                                     EventHandler<? super ParameterDrivenDateIntervalDetector> newHandler)

Build a new instance.

Specified by:

create in class AbstractDetector<ParameterDrivenDateIntervalDetector>

Parameters:

newMaxCheck - maximum checking interval (s)

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

getStartDriver

public DateDriver getStartDriver()

Get the driver for start date.

Note that the start date is automatically adjusted if either median date or duration are selected and changed.

Returns:

driver for start date

getStopDriver

public DateDriver getStopDriver()

Get the driver for stop date.

Note that the stop date is automatically adjusted if either median date or duration are selected changed.

Returns:

driver for stop date

getMedianDriver

public DateDriver getMedianDriver()

Get the driver for median date.

Note that the median date is automatically adjusted if either getStartDriver() start date or stop date are selected changed.

Returns:

driver for median date

getDurationDriver

public ParameterDriver getDurationDriver()

Get the driver for duration.

Note that the duration is automatically adjusted if either getStartDriver() start date or stop date are selected changed.

Returns:

driver for duration

g

public double g(SpacecraftState s)

Compute the value of the switching function.

The function is positive for dates within the interval defined by applying the parameter drivers shifts to reference dates, and negative for dates outside of this interval. Note that if Δt_start - Δt_stop is less than ref_stop.durationFrom(ref_start), then the interval degenerates to empty and the function never reaches positive values.

Specified by:

g in interface EventDetector

Specified by:

g in class AbstractDetector<ParameterDrivenDateIntervalDetector>

Parameters:

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

Returns:

value of the switching function