Class PointingPanel
- java.lang.Object
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- org.orekit.forces.Panel
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- org.orekit.forces.PointingPanel
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public class PointingPanel extends Panel
Class representing one panel of a satellite, roughly pointing towards some target.It is mainly used to represent a rotating solar array that points towards the Sun.
The panel rotation with respect to satellite body is the best pointing orientation achievable when the rotation axix is fixed by body attitude. Target is therefore always exactly in meridian plane defined by rotation axis and panel normal vector.
These panels are considered to be always
double-sided
.- Since:
- 3.0
- Author:
- Luc Maisonobe
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Constructor Summary
Constructors Constructor Description PointingPanel(Vector3D rotationAxis, ExtendedPVCoordinatesProvider target, double area, double drag, double liftRatio, double absorption, double reflection)
Simple constructor.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description <T extends CalculusFieldElement<T>>
FieldVector3D<T>getNormal(FieldSpacecraftState<T> state)
Get panel normal in spacecraft frame.Vector3D
getNormal(SpacecraftState state)
Get panel normal in spacecraft frame.-
Methods inherited from class org.orekit.forces.Panel
getAbsorption, getArea, getDrag, getLiftRatio, getReflection, isDoubleSided
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Constructor Detail
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PointingPanel
public PointingPanel(Vector3D rotationAxis, ExtendedPVCoordinatesProvider target, double area, 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.
The panel is considered to rotate about one axis in order to make its normal point as close as possible to the target. It means the target will always be in the plane defined by the rotation axis and the panel normal.
- Parameters:
rotationAxis
- rotation axis of the paneltarget
- target towards which the panel will point (the Sun for a solar array)area
- panel area in m²drag
- drag coefficientliftRatio
- 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)
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Method Detail
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getNormal
public Vector3D getNormal(SpacecraftState state)
Get panel normal in spacecraft frame.
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getNormal
public <T extends CalculusFieldElement<T>> FieldVector3D<T> getNormal(FieldSpacecraftState<T> state)
Get panel normal in spacecraft frame.
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