public class PointingPanel extends Panel
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
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Constructor and Description |
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PointingPanel(org.hipparchus.geometry.euclidean.threed.Vector3D rotationAxis,
ExtendedPVCoordinatesProvider target,
double area,
double drag,
double liftRatio,
double absorption,
double reflection)
Simple constructor.
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Modifier and Type | Method and Description |
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<T extends org.hipparchus.CalculusFieldElement<T>> |
getNormal(FieldSpacecraftState<T> state)
Get panel normal in spacecraft frame.
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org.hipparchus.geometry.euclidean.threed.Vector3D |
getNormal(SpacecraftState state)
Get panel normal in spacecraft frame.
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getAbsorption, getArea, getDrag, getLiftRatio, getReflection, isDoubleSided
public PointingPanel(org.hipparchus.geometry.euclidean.threed.Vector3D rotationAxis, ExtendedPVCoordinatesProvider target, double area, double drag, double liftRatio, double absorption, double reflection)
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.
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)public org.hipparchus.geometry.euclidean.threed.Vector3D getNormal(SpacecraftState state)
public <T extends org.hipparchus.CalculusFieldElement<T>> org.hipparchus.geometry.euclidean.threed.FieldVector3D<T> getNormal(FieldSpacecraftState<T> state)
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