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

All Methods Instance Methods Concrete Methods
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 Detail
  - 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 Detail
  - 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]