Class EpslAndNsl

java.lang.Object

gaiasky.util.gaia.BaseAttitudeDataServer<IAttitude>

gaiasky.util.gaia.AnalyticalAttitudeDataServer

gaiasky.util.gaia.EpslAndNsl

public class EpslAndNsl
extends AnalyticalAttitudeDataServer

Field Summary

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
EpslAndNsl()	Default constructor:
EpslAndNsl(long tRef, Epsl.Mode mode)	Constructor for arbitrary reference time (= switch from EPSL to NSL) and Epsl mode (PRECEDING or FOLLOWING):

Method Summary

Modifier and Type	Method	Description
IAttitude	getAttitudeNative(long tNow)	Evaluate the attitude in the native time system of the server
void	setRefTime(long t)	Sets the reference time in nanoseconds.

Methods inherited from class AnalyticalAttitudeDataServer

getNominalSunVector, getNuRef, getOmegaRef, getRefTime, getTargetPrecessionRate, getTargetScanPeriod, getTargetScanRate, getXiRef, inGap, setDefault, setNuRef, setOmegaRef, 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	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

Constructor Details

EpslAndNsl

public EpslAndNsl()

Default constructor:

EpslAndNsl

public EpslAndNsl(long tRef,
 Epsl.Mode mode)

Constructor for arbitrary reference time (= switch from EPSL to NSL) and Epsl mode (PRECEDING or FOLLOWING):

Parameters:

tRef - time of the switch

mode - which mode to switch to

Method Details

getAttitudeNative

public IAttitude getAttitudeNative(long tNow)

Description copied from class: BaseAttitudeDataServer

Evaluate the attitude in the native time system of the server

Specified by:

getAttitudeNative in class BaseAttitudeDataServer<IAttitude>

Parameters:

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

Returns:

attitude for the given time

See Also:

• BaseAttitudeDataServer.getAttitude(long)

setRefTime

public void setRefTime(long t)

Description copied from class: AnalyticalAttitudeDataServer

Sets the reference time in nanoseconds.

Overrides:

setRefTime in class AnalyticalAttitudeDataServer

Parameters:

t - [ns]