Class Nsl37

java.lang.Object

gaiasky.util.gaia.BaseAttitudeDataServer<IAttitude>

gaiasky.util.gaia.AnalyticalAttitudeDataServer

gaiasky.util.gaia.Nsl37

public class Nsl37
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
Nsl37()	Creates a new instance of the Nominal Scanning Law with default values from the GPDB

Method Summary

Modifier and Type	Method	Description
IAttitude	getAttitudeNative(double julianDate)	Calculate the scanning law at a given time.
protected IAttitude	getAttitudeNative(long tNow)	Evaluate the attitude in the native time system of the server
double	getLSunRef()
double	getNuFull()
double	getNuMod4Pi()
double	getOmegaDot1()
double	getOmegaFull()
double	getOmegaMod4Pi()
int	getOmegaRevs()
double	modFourPi(double angle)	Returns the argument modulo 4*pi [rad]
void	recomputeConstants()	Initializes quantities that only depend on the initial parameters.

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

Constructor Details

Nsl37

public Nsl37()

Creates a new instance of the Nominal Scanning Law with default values from the GPDB

Method Details

getAttitudeNative

public IAttitude getAttitudeNative(double julianDate)

Calculate the scanning law at a given time. See GAIA-CA-TN-OCA-FM-037-2

Parameters:

julianDate - The julian date

Returns:

The attidue object

getAttitudeNative

protected 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 in nanoseconds since epoch J2010

Returns:

The attitude object

recomputeConstants

public void recomputeConstants()

Initializes quantities that only depend on the initial parameters. Must be called whenever the scanning law parameters have been changed.

modFourPi

public double modFourPi(double angle)

Returns the argument modulo 4*pi [rad]

Parameters:

angle - angle [rad]

Returns:

angle modulo 4*PI

getNuFull

public double getNuFull()

Returns:

full precession angle [rad]

getNuMod4Pi

public double getNuMod4Pi()

Returns:

precession angle modulo 2 Pi

getOmegaFull

public double getOmegaFull()

Returns:

full spin angle [rad]

getOmegaRevs

public int getOmegaRevs()

Returns:

number of revolutions around the spin axis

getOmegaMod4Pi

public double getOmegaMod4Pi()

Returns:

spin angle modulo 4 Pi

getLSunRef

public double getLSunRef()

Returns:

longitude of sun [rad]

getOmegaDot1

public double getOmegaDot1()

Returns:

time derivative of spin angle