Package org.orekit.forces

Class Panel

java.lang.Object

org.orekit.forces.Panel

Direct Known Subclasses:

FixedPanel, PointingPanel, SlewingPanel

public abstract class Panel
extends Object

Base class representing one panel of a satellite.

Since:

3.0

Author:

Luc Maisonobe

See Also:

FixedPanel, PointingPanel, SlewingPanel

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	Panel(double area, boolean doubleSided, double drag, double liftRatio, double absorption, double reflection)	Simple constructor.

Method Summary

Modifier and Type	Method	Description
double	getAbsorption()	Get radiation pressure absorption coefficient.
double	getArea()	Get panel area.
double	getDrag()	Get drag coefficient.
double	getLiftRatio()	Get drag lift ratio.
abstract <T extends CalculusFieldElement<T>> FieldVector3D<T>	getNormal(FieldSpacecraftState<T> state)	Get panel normal in spacecraft frame.
abstract Vector3D	getNormal(SpacecraftState state)	Get panel normal in spacecraft frame.
double	getReflection()	Get radiation pressure specular reflection coefficient.
boolean	isDoubleSided()	Check if the panel is double-sided (typically solar arrays).

Methods inherited from class java.lang.Object

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

Constructor Detail

Panel

protected Panel(double area,
                boolean doubleSided,
                double drag,
                double liftRatio,
                double absorption,
                double reflection)

Simple constructor.

As the sum of absorption coefficient, specular reflection coefficient and diffuse reflection coefficient is exactly 1, only the first two coefficients are needed here, the third one is deduced from the other ones.

Parameters:

area - panel area in m²

doubleSided - if true, the panel is double-sided (typically solar arrays), otherwise it is the side of a box and only relevant for flux coming from its positive normal

drag - drag coefficient

liftRatio - drag lift ratio (proportion between 0 and 1 of atmosphere modecules that will experience specular reflection when hitting spacecraft instead of experiencing diffuse reflection, hence producing lift)

absorption - radiation pressure absorption coefficient (between 0 and 1)

reflection - radiation pressure specular reflection coefficient (between 0 and 1)

Method Detail

getArea

public double getArea()

Get panel area.

Returns:

panel area

isDoubleSided

public boolean isDoubleSided()

Check if the panel is double-sided (typically solar arrays).

Returns:

true if panel is double-sided

getDrag

public double getDrag()

Get drag coefficient.

Returns:

drag coefficient

getLiftRatio

public double getLiftRatio()

Get drag lift ratio.

Returns:

drag lift ratio

getAbsorption

public double getAbsorption()

Get radiation pressure absorption coefficient.

Returns:

radiation pressure absorption coefficient

getReflection

public double getReflection()

Get radiation pressure specular reflection coefficient.

Returns:

radiation pressure specular reflection coefficient

getNormal

public abstract Vector3D getNormal(SpacecraftState state)

Get panel normal in spacecraft frame.

Parameters:

state - current spacecraft state

Returns:

panel normal in spacecraft frame

getNormal

public abstract <T extends CalculusFieldElement<T>> FieldVector3D<T> getNormal(FieldSpacecraftState<T> state)

Get panel normal in spacecraft frame.

Type Parameters:

T - type of the field elements

Parameters:

state - current spacecraft state

Returns:

panel normal in spacecraft frame