org.orekit.rugged.los

Class PolynomialRotation

java.lang.Object

org.orekit.rugged.los.PolynomialRotation

All Implemented Interfaces:

LOSTransform, ParametricModel

public class PolynomialRotation
extends Object
implements LOSTransform

LOS transform based on a rotation with polynomial angle.

Author:

Luc Maisonobe

See Also:

LOSBuilder

Constructor Summary

Constructors

Constructor and Description
PolynomialRotation(ParameterType type, Vector3D axis, AbsoluteDate referenceDate, double... angleCoeffs) Simple constructor.
PolynomialRotation(ParameterType type, Vector3D axis, AbsoluteDate referenceDate, PolynomialFunction angle) Simple constructor.

Method Summary

Methods

Modifier and Type	Method and Description
void	getEstimatedParameters(double[] parameters, int start, int length) Get the current values of the estimated parameters.
int	getNbEstimatedParameters() Get the number of estimated parameters.
void	setEstimatedParameters(double[] parameters, int start, int length) Set new values for the estimated parameters.
FieldVector3D<DerivativeStructure>	transformLOS(int i, FieldVector3D<DerivativeStructure> los, AbsoluteDate date) Transform a line-of-sight and its partial derivatives.
Vector3D	transformLOS(int i, Vector3D los, AbsoluteDate date) Transform a line-of-sight.

Methods inherited from class java.lang.Object

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

Constructor Detail

PolynomialRotation

public PolynomialRotation(ParameterType type,
                  Vector3D axis,
                  AbsoluteDate referenceDate,
                  double... angleCoeffs)

Simple constructor.

The angle of the rotation is evaluated as a polynomial in t, where t is the duration in seconds between evaluation date and reference date. The parameters are the polynomial coefficients, with the constant term at index 0.

Parameters:

type - parameters type

axis - rotation axis

referenceDate - reference date for the polynomial angle

angleCoeffs - polynomial coefficients of the polynomial angle, with the constant term at index 0

PolynomialRotation

public PolynomialRotation(ParameterType type,
                  Vector3D axis,
                  AbsoluteDate referenceDate,
                  PolynomialFunction angle)

Simple constructor.

The angle of the rotation is evaluated as a polynomial in t, where t is the duration in seconds between evaluation date and reference date. The parameters are the polynomial coefficients, with the constant term at index 0.

Parameters:

type - parameters type

axis - rotation axis

referenceDate - reference date for the polynomial angle

angle - polynomial angle

Method Detail

getNbEstimatedParameters

public int getNbEstimatedParameters()

Get the number of estimated parameters.

Specified by:

getNbEstimatedParameters in interface ParametricModel

Returns:

number of estimated parameters

getEstimatedParameters

public void getEstimatedParameters(double[] parameters,
                          int start,
                          int length)
                            throws RuggedException

Get the current values of the estimated parameters.

The parameters are the polynomial coefficients, with the constant term at index 0.

Specified by:

getEstimatedParameters in interface ParametricModel

Parameters:

parameters - global array where to put the parameters

start - start index of the array slice to consider

length - number of elements in the array slice to consider

Throws:

RuggedException - if the size of the slice does not match the number of estimated parameters

setEstimatedParameters

public void setEstimatedParameters(double[] parameters,
                          int start,
                          int length)
                            throws RuggedException

Set new values for the estimated parameters.

The parameters are the polynomial coefficients, with the constant term at index 0.

Specified by:

setEstimatedParameters in interface ParametricModel

Parameters:

parameters - global array containing the parameters to set (among others)

start - start index of the array slice to consider

length - number of elements in the array slice to consider

Throws:

RuggedException - if the size of the slice does not match the number of estimated parameters

transformLOS

public Vector3D transformLOS(int i,
                    Vector3D los,
                    AbsoluteDate date)

Transform a line-of-sight.

Specified by:

transformLOS in interface LOSTransform

Parameters:

i - los pixel index

los - line-of-sight to transform

date - current date

Returns:

transformed line-of-sight

transformLOS

public FieldVector3D<DerivativeStructure> transformLOS(int i,
                                              FieldVector3D<DerivativeStructure> los,
                                              AbsoluteDate date)

Transform a line-of-sight and its partial derivatives.

This method is used for LOS calibration purposes. It allows to compute the Jacobian matrix of the LOS with respect to the parameters, which are typically polynomials coefficients representing rotation angles. These polynomials can be used for example to model thermo-elastic effects.

Specified by:

transformLOS in interface LOSTransform

Parameters:

i - los pixel index

los - line-of-sight to transform

date - date

Returns:

line of sight, and its first partial derivatives with respect to the parameters