stella.util
Class AuxiliaryPointing

java.lang.Object
  util.PropertyContainer
      stella.util.AuxiliaryPointing

All Implemented Interfaces:

Cloneable, PropertySupplying, VectorFunction

public class AuxiliaryPointing
extends PropertyContainer
implements VectorFunction

Basic pointing model that shows only a dependency of altitude. Model for a differential pointing model between auxiliar and main telescope. The minimum zero point of the elevation the pointing model was derived with is stated in elzero. Thus, trigonomertic functions are normalized to the mean of the observable cap via the definite integral F_j=∫∫F(az,el)dΩ/∫∫dΩ where the integral spans normally 0 to 2*π in azimuth and in height elzero to &pi/2, thus returning for the denominator ∫∫dΩ = 2*π*(1-sin(elzero); The nominators for the two trigonometric function ised in this simple model, i.e. for sin(h) and cos(h) read as 2*π*0.25*(1+cos(2*elzero)) for sin(h)
2*π*(π/4-elzero/2-.025*sin(2*elzero)) for cos(h) If done properly, no constant coefficients are needed, they are the rotation center of the guider CCD.

Field Summary

private static double	DEFAOFF Azimuth offset, in good alignment zero.
private static double	DEFEES Default zero.
private static double	DEFELZERO Default height in degrees.
private static double	DEFEOFF altitude offset, in good alignment zero.
private static double	DEFTF Default zero.
private double	fcose Normalization factor for the cosine function.
private double	fsine Normalization factor for the sine function.
static String	KEY_AOFF Azimuth offset, in good alignment zero.
static String	KEY_EES The coefficient for sin(h), the only relevant parameter in the x-cor.
static String	KEY_ELZERO The lower limit in elevation the pointing model was produced.
static String	KEY_EOFF Altitude offset, in good alignment zero.
static String	KEY_TF Tube flexure, the only relevant parameter for the y-correction.

Fields inherited from class util.PropertyContainer

KEY_LISTSEPARATOR, KEY_MAPKEYVALUECHAR, KEY_MAPSEPARATOR

Fields inherited from interface util.PropertySupplying

CONFIG, KEY_CLASS

Constructor Summary

AuxiliaryPointing(Map<String,String> prop)
Defaults all but the tube flexure.

Method Summary

int	argumentDimension() We act on az/alt, thus we return 2 here.
VectorG	evaluate(VectorG nautz) Retruns a Vector2D, x as azimuth, normally zero and y altitude pm, defined by the tube flexure.
int	functionDimension() The default implementation returns two corrections one fror az and alt.

Methods inherited from class util.PropertyContainer

augment, augment, augment, clone, defaultBoolean, defaultChar, defaultDouble, defaultFloat, defaultInt, defaultLong, defaultObject, defaultObject, defaultProperties, defaultProperty, getAsBoolean, getAsChar, getAsDouble, getAsEnums, getAsFloat, getAsInt, getAsList, getAsLong, getAsMap, getAsMap, getAsObject, getAsObject, getProperties, getProperty, has, init, isNew, parseObject, reload, reload, removeProperty, rescanned, setObject, setProperties, setProperty, stringProperties, toString

Methods inherited from class java.lang.Object

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

Field Detail

KEY_AOFF

public static final String KEY_AOFF

Azimuth offset, in good alignment zero.

See Also:

Constant Field Values

KEY_EOFF

public static final String KEY_EOFF

Altitude offset, in good alignment zero.

See Also:

Constant Field Values

KEY_EES

public static final String KEY_EES

The coefficient for sin(h), the only relevant parameter in the x-cor.

See Also:

Constant Field Values

KEY_TF

public static final String KEY_TF

Tube flexure, the only relevant parameter for the y-correction.

See Also:

Constant Field Values

KEY_ELZERO

public static final String KEY_ELZERO

The lower limit in elevation the pointing model was produced.

See Also:

Constant Field Values

DEFAOFF

private static final double DEFAOFF

Azimuth offset, in good alignment zero.

See Also:

Constant Field Values

DEFEOFF

private static final double DEFEOFF

altitude offset, in good alignment zero.

See Also:

Constant Field Values

DEFELZERO

private static final double DEFELZERO

Default height in degrees.

See Also:

Constant Field Values

DEFEES

private static final double DEFEES

Default zero.

See Also:

Constant Field Values

DEFTF

private static final double DEFTF

Default zero.

See Also:

Constant Field Values

fsine

private double fsine

Normalization factor for the sine function.

fcose

private double fcose

Normalization factor for the cosine function.

Constructor Detail

AuxiliaryPointing

public AuxiliaryPointing(Map<String,String> prop)

Defaults all but the tube flexure.

Method Detail

argumentDimension

public int argumentDimension()

We act on az/alt, thus we return 2 here.

Specified by:

argumentDimension in interface VectorFunction

functionDimension

public int functionDimension()

The default implementation returns two corrections one fror az and alt. Subclasses may include derotator and dome offsets.

Specified by:

functionDimension in interface VectorFunction

evaluate

public VectorG evaluate(VectorG nautz)

Retruns a Vector2D, x as azimuth, normally zero and y altitude pm, defined by the tube flexure. All parameters, also the arguments are expected in degrees.

Specified by:

evaluate in interface VectorFunction