fr.cnes.sirius.patrius.frames.configuration.precessionnutation

Class PrecessionNutationCache

java.lang.Object

fr.cnes.sirius.patrius.frames.configuration.precessionnutation.PrecessionNutationCache

All Implemented Interfaces:

PrecessionNutationModel, Serializable

Deprecated.

since 4.13 as the precession nutation corrections cache management is deported in the PrecessionNutationInterpolation class which uses a more efficient TimeStampedInterpolableEphemeris cache system.

@Deprecated
public class PrecessionNutationCache
extends Object
implements PrecessionNutationModel

Cache for precession nutation correction computation. This class is to be used for GCRF to CIRF transformation.

This implementation includes a caching/interpolation feature to tremendously improve efficiency. The IAU-2000 model involves lots of terms (1600 components for x, 1275 components for y and 66 components for s). Recomputing all these components for each point is really slow. The shortest period for these components is about 5.5 days (one fifth of the moon revolution period), hence the pole motion is smooth at the day or week scale. This implies that these motions can be computed accurately using a few reference points per day or week and interpolated between these points. This implementation uses 12 points separated by 1/2 day (43200 seconds) each, the resulting maximal interpolation error on the frame is about 1.3×10^-10 arcseconds. -- Orekit

Since:

1.2

Author:

Rami Houdroge

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
PrecessionNutationCache(PrecessionNutationModel pnModel) Deprecated. since 4.13 as the precession nutation corrections cache management is deported in the PrecessionNutationInterpolation class which uses a more efficient TimeStampedInterpolableEphemeris cache system.
PrecessionNutationCache(PrecessionNutationModel pnModel, double span, int interpolationPoints) Deprecated. since 4.13 as the precession nutation corrections cache management is deported in the PrecessionNutationInterpolation class which uses a more efficient TimeStampedInterpolableEphemeris cache system.

Method Summary

Modifier and Type	Method and Description
CIPCoordinates	getCIPCoordinates(AbsoluteDate date) Deprecated. Getter for the CIP coordinates at the provided date.
double[]	getCIPMotion(AbsoluteDate date) Deprecated. Compute the Celestial Intermediate pole motion in the GCRS.
double[]	getCIPMotionTimeDerivative(AbsoluteDate date) Deprecated. Compute the Celestial Intermediate pole motion in the GCRS.
FrameConvention	getOrigin() Deprecated. Get IERS model origin.
boolean	isDirect() Deprecated. Return computation type : direct or interpolated.

Methods inherited from class java.lang.Object

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

Constructor Detail

PrecessionNutationCache

@Deprecated
public PrecessionNutationCache(PrecessionNutationModel pnModel,
                                           double span,
                                           int interpolationPoints)

Deprecated. since 4.13 as the precession nutation corrections cache management is deported in the PrecessionNutationInterpolation class which uses a more efficient TimeStampedInterpolableEphemeris cache system.

Parameters:

pnModel - IERS model to use

span - time spane between interpolation points

interpolationPoints - number of interpolation points to use

PrecessionNutationCache

@Deprecated
public PrecessionNutationCache(PrecessionNutationModel pnModel)

Deprecated. since 4.13 as the precession nutation corrections cache management is deported in the PrecessionNutationInterpolation class which uses a more efficient TimeStampedInterpolableEphemeris cache system.

Parameters:

pnModel - IERS model to use

Method Detail

getCIPCoordinates

public CIPCoordinates getCIPCoordinates(AbsoluteDate date)

Deprecated.

Getter for the CIP coordinates at the provided date.

Specified by:

getCIPCoordinates in interface PrecessionNutationModel

Parameters:

date - Date for the CIP coordinates

Returns:

the CIP coordinates

getCIPMotion

public double[] getCIPMotion(AbsoluteDate date)

Deprecated.

Compute the Celestial Intermediate pole motion in the GCRS.

Parameters:

date - Date for the CIP motion

Returns:

CIP motion as an array of doubles

getCIPMotionTimeDerivative

public double[] getCIPMotionTimeDerivative(AbsoluteDate date)

Deprecated.

Compute the Celestial Intermediate pole motion in the GCRS.

Parameters:

date - Date for the CIP motion time derivatives

Returns:

CIP motion time derivatives as an array of doubles

isDirect

public boolean isDirect()

Deprecated.

Return computation type : direct or interpolated.

Specified by:

isDirect in interface PrecessionNutationModel

Returns:

true if direct computation, false if interpolated

getOrigin

public FrameConvention getOrigin()

Deprecated.

Get IERS model origin.

Specified by:

getOrigin in interface PrecessionNutationModel

Returns:

IERS model origin