Package org.orekit.rugged.los

Class PolynomialRotation

java.lang.Object

org.orekit.rugged.los.PolynomialRotation

All Implemented Interfaces:

LOSTransform

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	Description
PolynomialRotation(String name, Vector3D axis, AbsoluteDate referenceDate, double... angleCoeffs)	Simple constructor.
PolynomialRotation(String name, Vector3D axis, AbsoluteDate referenceDate, PolynomialFunction angle)	Simple constructor.

Method Summary

Modifier and Type	Method	Description
Stream<ParameterDriver>	getParametersDrivers()	Get the drivers for LOS parameters.
<T extends Derivative<T>> FieldVector3D<T>	transformLOS(int i, FieldVector3D<T> los, AbsoluteDate date, DerivativeGenerator<T> generator)	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(String name,
                          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:

name - name of the rotation (used for estimated parameters identification)

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(String name,
                          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:

name - name of the rotation (used for estimated parameters identification)

axis - rotation axis

referenceDate - reference date for the polynomial angle

angle - polynomial angle

Method Detail

getParametersDrivers

public Stream<ParameterDriver> getParametersDrivers()

Get the drivers for LOS parameters.

Specified by:

getParametersDrivers in interface LOSTransform

Returns:

drivers for LOS parameters

Since:

2.0

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 <T extends Derivative<T>> FieldVector3D<T> transformLOS(int i,
                                                               FieldVector3D<T> los,
                                                               AbsoluteDate date,
                                                               DerivativeGenerator<T> generator)

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

Type Parameters:

T - derivative type

Parameters:

i - los pixel index

los - line-of-sight to transform

date - date

generator - generator to use for building DerivativeStructure instances

Returns:

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