Package gaiasky.util.gaia

Class EpslAndNsl

java.lang.Object

gaiasky.util.gaia.BaseAttitudeDataServer<Attitude>

gaiasky.util.gaia.AnalyticalAttitudeDataServer

gaiasky.util.gaia.EpslAndNsl

public class EpslAndNsl
extends AnalyticalAttitudeDataServer

This class implements a combination of the Ecliptic Pole Scanning Law (EPSL) and the Nominal Scanning Law (NSL), by switching from EPSL to NSL at the reference epoch (tRef). Since the scanning law parameters (in particular nuRef and omegaRef) apply to tRef, this means there is no discontinuity in the motion of the z axis when switching from EPSL to NSL.

Field Summary

Fields inherited from class gaiasky.util.gaia.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

Fields inherited from class gaiasky.util.gaia.BaseAttitudeDataServer

initialized, initialRequestedTimeContext, nativeTimeContext, withUncertaintiesCorrelations

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
Attitude	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 gaiasky.util.gaia.AnalyticalAttitudeDataServer

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

Methods inherited from class gaiasky.util.gaia.BaseAttitudeDataServer

getAttitude, getAttitude, isInitialized, setInitialized

Methods inherited from class java.lang.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 Attitude 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<Attitude>

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]