java.lang.Object
- org.orekit.frames.SingleParameterFitter

All Implemented Interfaces:

Serializable
```
public class SingleParameterFitter
extends Object
implements Serializable
```
Fitter for one Earth Orientation Parameter.

Since:

12.0

Author:

Luc Maisonobe

See Also:

PredictedEOPHistory, EOPFitter, SecularAndHarmonic, Serialized Form

Field Summary

Fields
Modifier and Type Field Description

static double MOON_DRACONIC_PULSATION
Moon pulsation (one Moon draconic period).

static double SUN_PULSATION
Sun pulsation, one year period.

Constructor Summary

Constructors
Constructor	Description
`SingleParameterFitter(double timeConstant, double convergence, int degree, double... pulsations)`	Simple constructor.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static SingleParameterFitter`	`createDefaultDut1FitterLongTermPrediction()`	Create fitter with default parameters adapted for fitting orientation parameters dUT1 and LOD for long term prediction.
`static SingleParameterFitter`	`createDefaultDut1FitterShortTermPrediction()`	Create fitter with default parameters adapted for fitting orientation parameters dUT1 and LOD for short term prediction.
`static SingleParameterFitter`	`createDefaultNutationFitterLongTermPrediction()`	Create fitter with default parameters adapted for fitting nutation parameters dx and dy for long term prediction.
`static SingleParameterFitter`	`createDefaultNutationFitterShortTermPrediction()`	Create fitter with default parameters adapted for fitting nutation parameters dx and dy for long term prediction.
`static SingleParameterFitter`	`createDefaultPoleFitterLongTermPrediction()`	Create fitter with default parameters adapted for fitting pole parameters Xp and Yp for long term prediction.
`static SingleParameterFitter`	`createDefaultPoleFitterShortTermPrediction()`	Create fitter with default parameters adapted for fitting pole parameters Xp and Yp for long term prediction.
`SecularAndHarmonic`	`fit(EOPHistory rawHistory, ToDoubleFunction<EOPEntry> extractor)`	Perform secular and harmonic fitting.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - SUN_PULSATION
```
public static final double SUN_PULSATION
```
    Sun pulsation, one year period.
    
    See Also:
    
    Constant Field Values
  - MOON_DRACONIC_PULSATION
```
public static final double MOON_DRACONIC_PULSATION
```
    Moon pulsation (one Moon draconic period).
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - SingleParameterFitter
```
public SingleParameterFitter(double timeConstant,
                             double convergence,
                             int degree,
                             double... pulsations)
```
    Simple constructor.
    
    Parameters:
    
    timeConstant - time constant \(\tau\) of the exponential decay weight, point weight is \(e^{\frac{t-t_0}{\tau}}\), i.e. points far in the past before \(t_0\) have smaller weights
    
    convergence - convergence on fitted parameter
    
    degree - degree of the polynomial model
    
    pulsations - pulsations of harmonic part (rad/s)
    
    Since:
    
    12.0.1
    
    See Also:
    
    createDefaultDut1FitterShortTermPrediction(), createDefaultDut1FitterLongTermPrediction(), createDefaultPoleFitterShortTermPrediction(), createDefaultPoleFitterLongTermPrediction(), createDefaultNutationFitterShortTermPrediction(), createDefaultNutationFitterLongTermPrediction(), SecularAndHarmonic
- Method Detail
  - fit
```
public SecularAndHarmonic fit(EOPHistory rawHistory,
                              ToDoubleFunction<EOPEntry> extractor)
```
    Perform secular and harmonic fitting.
    
    Parameters:
    
    rawHistory - EOP history to fit
    
    extractor - extractor for Earth Orientation Parameter
    
    Returns:
    
    configured fitter
  - createDefaultDut1FitterShortTermPrediction
```
public static SingleParameterFitter createDefaultDut1FitterShortTermPrediction()
```
    Create fitter with default parameters adapted for fitting orientation parameters dUT1 and LOD for short term prediction.
    The main difference between these settings and the settings for long prediction is the much smaller \(\tau\). This means more weight is set to the points at the end of the history, hence forcing the fitted prediction model to be closer to these points, hence the prediction error to be smaller just after raw history end. On the other hand, this implies that the model will diverge on long term. These settings are intended when prediction is used for at most 5 days after raw EOP end.
    
    time constant \(\tau\) of the exponential decay set to 6 days
    
    convergence set to 10⁻¹² s
    
    polynomial part set to degree 3
    
    one harmonic term at SUN_PULSATION}
    
    one harmonic term at 2 times SUN_PULSATION}
    
    one harmonic term at 3 times SUN_PULSATION}
    
    one harmonic term at MOON_DRACONIC_PULSATION}
    
    one harmonic term at 2 times MOON_DRACONIC_PULSATION}
    
    one harmonic term at 3 times MOON_DRACONIC_PULSATION}
    Returns:
    
    fitter with default configuration for orientation parameters dUT1 and LOD
    
    See Also:
    
    createDefaultDut1FitterShortTermPrediction()
  - createDefaultDut1FitterLongTermPrediction
```
public static SingleParameterFitter createDefaultDut1FitterLongTermPrediction()
```
    Create fitter with default parameters adapted for fitting orientation parameters dUT1 and LOD for long term prediction.
    The main difference between these settings and the settings for short prediction is the much larger \(\tau\). This means weight is spread throughout history, hence forcing the fitted prediction model to be remain very stable on the long term. On the other hand, this implies that the model will start with already a much larger error just after raw history end. These settings are intended when prediction is used for 5 days after raw EOP end or more.
    
    time constant \(\tau\) of the exponential decay set to 60 days
    
    convergence set to 10⁻¹² s
    
    polynomial part set to degree 3
    
    one harmonic term at SUN_PULSATION}
    
    one harmonic term at 2 times SUN_PULSATION}
    
    one harmonic term at 3 times SUN_PULSATION}
    
    one harmonic term at MOON_DRACONIC_PULSATION}
    
    one harmonic term at 2 times MOON_DRACONIC_PULSATION}
    
    one harmonic term at 3 times MOON_DRACONIC_PULSATION}
    Returns:
    
    fitter with default configuration for orientation parameters dUT1 and LOD
    
    See Also:
    
    createDefaultDut1FitterShortTermPrediction()
  - createDefaultPoleFitterShortTermPrediction
```
public static SingleParameterFitter createDefaultPoleFitterShortTermPrediction()
```
    Create fitter with default parameters adapted for fitting pole parameters Xp and Yp for long term prediction.
    The main difference between these settings and the settings for long prediction is the much smaller \(\tau\). This means more weight is set to the points at the end of the history, hence forcing the fitted prediction model to be closer to these points, hence the prediction error to be smaller just after raw history end. On the other hand, this implies that the model will diverge on long term. These settings are intended when prediction is used for at most 5 days after raw EOP end.
    
    time constant \(\tau\) of the exponential decay set to 12 days
    
    convergence set to 10⁻¹² rad
    
    polynomial part set to degree 3
    
    one harmonic term at SUN_PULSATION}
    
    one harmonic term at 2 times SUN_PULSATION}
    
    one harmonic term at 3 times SUN_PULSATION}
    
    one harmonic term at MOON_DRACONIC_PULSATION}
    
    one harmonic term at 2 times MOON_DRACONIC_PULSATION}
    
    one harmonic term at 3 times MOON_DRACONIC_PULSATION}
    Returns:
    
    fitter with default configuration for pole parameters Xp and Yp
  - createDefaultPoleFitterLongTermPrediction
```
public static SingleParameterFitter createDefaultPoleFitterLongTermPrediction()
```
    Create fitter with default parameters adapted for fitting pole parameters Xp and Yp for long term prediction.
    The main difference between these settings and the settings for short prediction is the much larger \(\tau\). This means weight is spread throughout history, hence forcing the fitted prediction model to be remain very stable on the long term. On the other hand, this implies that the model will start with already a much larger error just after raw history end. These settings are intended when prediction is used for 5 days after raw EOP end or more.
    
    time constant \(\tau\) of the exponential decay set to 60 days
    
    convergence set to 10⁻¹² rad
    
    polynomial part set to degree 3
    
    one harmonic term at SUN_PULSATION}
    
    one harmonic term at 2 times SUN_PULSATION}
    
    one harmonic term at 3 times SUN_PULSATION}
    
    one harmonic term at MOON_DRACONIC_PULSATION}
    
    one harmonic term at 2 times MOON_DRACONIC_PULSATION}
    
    one harmonic term at 3 times MOON_DRACONIC_PULSATION}
    Returns:
    
    fitter with default configuration for pole parameters Xp and Yp
  - createDefaultNutationFitterShortTermPrediction
```
public static SingleParameterFitter createDefaultNutationFitterShortTermPrediction()
```
    Create fitter with default parameters adapted for fitting nutation parameters dx and dy for long term prediction.
    The main difference between these settings and the settings for long prediction is the much smaller \(\tau\). This means more weight is set to the points at the end of the history, hence forcing the fitted prediction model to be closer to these points, hence the prediction error to be smaller just after raw history end. On the other hand, this implies that the model will diverge on long term. These settings are intended when prediction is used for at most 5 days after raw EOP end.
    
    time constant \(\tau\) of the exponential decay set to 12 days
    
    convergence set to 10⁻¹² s
    
    polynomial part set to degree 3
    
    one harmonic term at SUN_PULSATION}
    
    one harmonic term at 2 times SUN_PULSATION}
    
    one harmonic term at 3 times SUN_PULSATION}
    
    one harmonic term at MOON_DRACONIC_PULSATION}
    
    one harmonic term at 2 times MOON_DRACONIC_PULSATION}
    
    one harmonic term at 3 times MOON_DRACONIC_PULSATION}
    Returns:
    
    fitter with default configuration for pole nutation parameters dx and dy
  - createDefaultNutationFitterLongTermPrediction
```
public static SingleParameterFitter createDefaultNutationFitterLongTermPrediction()
```
    Create fitter with default parameters adapted for fitting nutation parameters dx and dy for long term prediction.
    The main difference between these settings and the settings for short prediction is the much larger \(\tau\). This means weight is spread throughout history, hence forcing the fitted prediction model to be remain very stable on the long term. On the other hand, this implies that the model will start with already a much larger error just after raw history end. These settings are intended when prediction is used for 5 days after raw EOP end or more.
    
    time constant \(\tau\) of the exponential decay set to 60 days
    
    convergence set to 10⁻¹² s
    
    polynomial part set to degree 3
    
    one harmonic term at SUN_PULSATION}
    
    one harmonic term at 2 times SUN_PULSATION}
    
    one harmonic term at 3 times SUN_PULSATION}
    
    one harmonic term at MOON_DRACONIC_PULSATION}
    
    one harmonic term at 2 times MOON_DRACONIC_PULSATION}
    
    one harmonic term at 3 times MOON_DRACONIC_PULSATION}
    Returns:
    
    fitter with default configuration for pole nutation parameters dx and dy

Modifier and Type	Field	Description
`static double`	`MOON_DRACONIC_PULSATION`	Moon pulsation (one Moon draconic period).
`static double`	`SUN_PULSATION`	Sun pulsation, one year period.

Class SingleParameterFitter

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

SUN_PULSATION

MOON_DRACONIC_PULSATION

Constructor Detail

SingleParameterFitter

Method Detail

fit

createDefaultDut1FitterShortTermPrediction

createDefaultDut1FitterLongTermPrediction

createDefaultPoleFitterShortTermPrediction

createDefaultPoleFitterLongTermPrediction

createDefaultNutationFitterShortTermPrediction

createDefaultNutationFitterLongTermPrediction