Class TransitionScanningLaw

java.lang.Object

gaiasky.util.gaia.BaseAttitudeDataServer<IAttitude>

gaiasky.util.gaia.AnalyticalAttitudeDataServer

gaiasky.util.gaia.TransitionScanningLaw

public class TransitionScanningLaw
extends AnalyticalAttitudeDataServer

Field Summary

Fields

Modifier and Type	Field	Description
protected double	acc
protected double	eps	Relative tolerance for exceeding the ramp
protected double	om0
protected double	om1
protected double	om2
protected double	om3
protected double	om4
protected Duration	ramp

Fields inherited from class AnalyticalAttitudeDataServer

ARCSEC_PER_S_TO_DEG_PER_DAY, FOUR_PI, nslSun, OBLIQUITY_DEG, OBLIQUITY_RAD, PI, PI_HALF, targetScanPeriod, TWO_PI, X_AXIS, Y_AXIS, Z_AXIS

Modifier and Type	Field	Description
protected static final double	ARCSEC_PER_S_TO_DEG_PER_DAY	Factor converting from arcsec/s to deg/day
protected static final double	FOUR_PI
protected NslSun	nslSun
protected static final double	OBLIQUITY_DEG
protected static final double	OBLIQUITY_RAD	The obliquity of the ecliptic
protected static final double	PI	Mathematical constants
protected static final double	PI_HALF
protected long	targetScanPeriod	The time in ns of one rotation of the satellite around its spin axis.
protected static final double	TWO_PI
protected static final Vector3D	X_AXIS	Unit vectors
protected static final Vector3D	Y_AXIS
protected static final Vector3D	Z_AXIS

Fields inherited from class BaseAttitudeDataServer

initialized, initialRequestedTimeContext, nativeTimeContext, withUncertaintiesCorrelations

Modifier and Type	Field	Description
protected boolean	initialized	Some scanning laws have constants or tables for interpolation that need to be computed before the first use and recomputed after changing certain reference values.
protected TimeContext	initialRequestedTimeContext
protected TimeContext	nativeTimeContext	native and initially requested time context of the server - has to be set by the implementing class
protected boolean	withUncertaintiesCorrelations	switch to decide if attitude uncertainties and correlations should be calculated

Constructor Summary

Constructors

Constructor	Description
TransitionScanningLaw(Duration ramp)	The constructor is the only way to set the duration of the ramp

Method Summary

Modifier and Type	Method	Description
IAttitude	getAttitudeNative(long time)	Evaluate the attitude in the native time system of the server
Epsl.Mode	getMode()	Return the Epsl.Mode (preceding or following)
Duration	getRampDuration()	Return the duration of the ramp
void	initialize()	Initialization mainly calculates the acceleration required for the specified ramp
TransitionScanningLaw	setMode(Epsl.Mode mode)	Preferred method to set the Epsl.Mode (it can also be set using setNuRef)

Methods inherited from class AnalyticalAttitudeDataServer

getNominalSunVector, getNuRef, getOmegaRef, getRefTime, getTargetPrecessionRate, getTargetScanPeriod, getTargetScanRate, getXiRef, inGap, setDefault, setNuRef, setOmegaRef, setRefTime, setTargetPrecessionRate, setTargetScanPeriod, setTargetScanRate, setXiRef

Modifier and Type	Method	Description
protected NslSun	getNominalSunVector()
double	getNuRef()	Get the reference revolving phase angle
double	getOmegaRef()	Get the reference scan phase angle
long	getRefTime()	Ref time in nanoseconds since epoch.
double	getTargetPrecessionRate()	Get the target precession rate
long	getTargetScanPeriod()	Get the target scan period
double	getTargetScanRate()	Get the target scan rate
double	getXiRef()	Get the reference solar aspect angle
boolean	inGap(long time)
void	setDefault()	Set all parameters to default values (from GaiaParam)
void	setNuRef(double nuRef)	Set the reference value for the precession phase angle (nu)
void	setOmegaRef(double omegaRef)	Set the reference value for the spin phase abgle (Omega)
void	setRefTime(long tRef)	Sets the reference time in nanoseconds.
void	setTargetPrecessionRate(double targetPrecessionRate)	Set the target precession rate
void	setTargetScanPeriod(long targetScanPeriod)	Set the target scan period
void	setTargetScanRate(double targetScanRate)	Set the target scan rate
void	setXiRef(double xiRef)	Set the reference value for the solar aspect angle (xi)

Methods inherited from class BaseAttitudeDataServer

getAttitude, getAttitude, getAttitude, isInitialized, setInitialized

Modifier and Type	Method	Description
IAttitude	getAttitude(long time)
IAttitude	getAttitude(Instant instant)
IAttitude	getAttitude(Date date)
boolean	isInitialized()
void	setInitialized(boolean initialized)

Methods inherited from class Object

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

Field Details

ramp

protected Duration ramp

acc

protected double acc

om0

protected double om0

om1

protected double om1

om2

protected double om2

om3

protected double om3

om4

protected double om4

eps

protected double eps

Relative tolerance for exceeding the ramp

Constructor Details

TransitionScanningLaw

public TransitionScanningLaw(Duration ramp)

The constructor is the only way to set the duration of the ramp

Parameters:

ramp -

Method Details

getMode

public Epsl.Mode getMode()

Return the Epsl.Mode (preceding or following)

Returns:

The mode

setMode

public TransitionScanningLaw setMode(Epsl.Mode mode)

Preferred method to set the Epsl.Mode (it can also be set using setNuRef)

Parameters:

mode - EPSL preceding or following

Returns:

This object with the right mode set

getRampDuration

public Duration getRampDuration()

Return the duration of the ramp

initialize

public void initialize()

Initialization mainly calculates the acceleration required for the specified ramp

getAttitudeNative

public IAttitude getAttitudeNative(long time)

Description copied from class: BaseAttitudeDataServer

Evaluate the attitude in the native time system of the server

Specified by:

getAttitudeNative in class BaseAttitudeDataServer<IAttitude>

Parameters:

time - - the time elapsed since the epoch of J2010 in ns (TCB)

Returns:

attitude for the given time

See Also:

• BaseAttitudeDataServer.getAttitude(long)