stella.util
Class PointingFunction.ClassicModel

java.lang.Object
  stella.util.PointingFunction
      stella.util.PointingFunction.ClassicModel

All Implemented Interfaces:

VectorFunction

Enclosing class:

PointingFunction

public static class PointingFunction.ClassicModel
extends PointingFunction

The classical pointing model. According to OpenTSI 1.0 it reads as follows:

       Δaz=-AN·sin(A)·ctg(Z)+AE·cos(A)·ctg(Z)
       +NPAE·ctg(Z)-BNP/sin(Z)+AOFF

       Δzd=AN·cos(A)+AE·sin(A)+TF·sin(Z)+ZOFF
       

Note that the original document had a sign error in the ezimuth model on AN and AE. Note also that the pilar model is using the zenith distance instead of the more standard elevation (Z=90-El).

Nested Class Summary

Nested classes/interfaces inherited from class stella.util.PointingFunction

PointingFunction.ClassicModel, PointingFunction.ExtendedModel, PointingFunction.FullModel

Field Summary

static Map<String,Double>

MAPPING Mapping of parameter names to values.

Fields inherited from class stella.util.PointingFunction

POINTINGMODELS

Constructor Summary

PointingFunction.ClassicModel()

Method Summary

VectorG	evaluate(VectorG nautz) The classic pointing model expects the nautic azimuth in the first argument and the zenith distance in the second, both in degrees.
String	getModelName() Returns the name of this model.
Set<String>	getParameterNames() Returns the parameter names as known by pilar.
boolean	setParameter(String name, double value) Sets a given parameter to a certain value.

Methods inherited from class stella.util.PointingFunction

argumentDimension, createFromType, functionDimension

Methods inherited from class java.lang.Object

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

Field Detail

MAPPING

public static final Map<String,Double> MAPPING

Mapping of parameter names to values.

Constructor Detail

PointingFunction.ClassicModel

public PointingFunction.ClassicModel()

Method Detail

getModelName

public String getModelName()

Returns the name of this model. This is used in querying the parameters from Pilar.

Specified by:

getModelName in class PointingFunction

getParameterNames

public Set<String> getParameterNames()

Returns the parameter names as known by pilar.

Specified by:

getParameterNames in class PointingFunction

setParameter

public boolean setParameter(String name,
                            double value)

Sets a given parameter to a certain value.

Specified by:

setParameter in class PointingFunction

Returns:

True, if the parameter is found.

evaluate

public VectorG evaluate(VectorG nautz)

The classic pointing model expects the nautic azimuth in the first argument and the zenith distance in the second, both in degrees. It returns the correction (pointing_true=argument+return_value) to the nautic azimuth in the first argument and the correction to zenith distance in the second.

Parameters:

nautz - Two-dim vector with nautic azimuth and zenith distance in degrees.

Returns:

Correction to pointing in Pilar units, normally degrees.