Class Patera2005
- java.lang.Object
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- org.orekit.ssa.collision.shorttermencounter.probability.twod.AbstractShortTermEncounter2DPOCMethod
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- org.orekit.ssa.collision.shorttermencounter.probability.twod.AbstractShortTermEncounter1DNumerical2DPOCMethod
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- org.orekit.ssa.collision.shorttermencounter.probability.twod.Patera2005
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- All Implemented Interfaces:
ShortTermEncounter2DPOCMethod
public class Patera2005 extends AbstractShortTermEncounter1DNumerical2DPOCMethod
Compute the probability of collision using the method described in :"PATERA, Russell P. Calculating collision probability for arbitrary space vehicle shapes via numerical quadrature. Journal of guidance, control, and dynamics, 2005, vol. 28, no 6, p. 1326-1328.".It is one of the recommended methods to use.
It assumes :
- Short encounter leading to a linear relative motion.
- Spherical collision object (in this implementation only. The method could be used on non spherical object).
- Uncorrelated positional covariance.
- Gaussian distribution of the position uncertainties.
- Deterministic velocity i.e. no velocity uncertainties.
- Since:
- 12.0
- Author:
- Vincent Cucchietti
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Field Summary
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Fields inherited from class org.orekit.ssa.collision.shorttermencounter.probability.twod.AbstractShortTermEncounter2DPOCMethod
DEFAULT_TCA_DIFFERENCE_TOLERANCE
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Fields inherited from interface org.orekit.ssa.collision.shorttermencounter.probability.twod.ShortTermEncounter2DPOCMethod
DEFAULT_ZERO_THRESHOLD
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Constructor Summary
Constructors Constructor Description Patera2005()
Default constructor built with the following trapezoid integrator: Minimal iteration count of 5 Maximum iteration count of 50000 .Patera2005(UnivariateIntegrator integrator, int maxNbOfEval)
Customizable constructor.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description ProbabilityOfCollision
compute(double xm, double ym, double sigmaX, double sigmaY, double radius, UnivariateIntegrator integrator, int customMaxNbOfEval)
Compute the probability of collision using arguments specific to the rotated encounter frame and custom numerical configuration.<T extends CalculusFieldElement<T>>
FieldProbabilityOfCollision<T>compute(T xm, T ym, T sigmaX, T sigmaY, T radius, FieldUnivariateIntegrator<T> customIntegrator, int customMaxNbOfEval)
Compute the probability of collision using arguments specific to the rotated encounter frame and custom numerical configuration.ShortTermEncounter2DPOCMethodType
getType()
Get type of the method.-
Methods inherited from class org.orekit.ssa.collision.shorttermencounter.probability.twod.AbstractShortTermEncounter1DNumerical2DPOCMethod
compute, compute, compute, compute, compute, compute, compute, compute
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Methods inherited from class org.orekit.ssa.collision.shorttermencounter.probability.twod.AbstractShortTermEncounter2DPOCMethod
compute, compute, compute, compute, compute, compute, getName, getObjectOrbitFromCdm, getObjectStateCovarianceFromCdm, isAMaximumProbabilityOfCollisionMethod
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Constructor Detail
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Patera2005
public Patera2005()
Default constructor built with the following trapezoid integrator:- Minimal iteration count of 5
- Maximum iteration count of 50000
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Patera2005
public Patera2005(UnivariateIntegrator integrator, int maxNbOfEval)
Customizable constructor.- Parameters:
integrator
- integratormaxNbOfEval
- max number of evaluation
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Method Detail
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compute
public ProbabilityOfCollision compute(double xm, double ym, double sigmaX, double sigmaY, double radius, UnivariateIntegrator integrator, int customMaxNbOfEval)
Compute the probability of collision using arguments specific to the rotated encounter frame and custom numerical configuration.The rotated encounter frame is define by the initial encounter frame (defined in
ShortTermEncounter2DDefinition
) rotated by the rotation matrix which is used to diagonalize the combined covariance matrix.- Specified by:
compute
in classAbstractShortTermEncounter1DNumerical2DPOCMethod
- Parameters:
xm
- other collision object projected position onto the collision plane in the rotated encounter frame x-axis (m)ym
- other collision object projected position onto the collision plane in the rotated encounter frame y-axis (m)sigmaX
- square root of the x-axis eigen value of the diagonalized combined covariance matrix projected onto the collision plane (m)sigmaY
- square root of the y-axis eigen value of the diagonalized combined covariance matrix projected onto the collision plane (m)radius
- sum of primary and secondary collision object equivalent sphere radii (m)integrator
- custom integrator to use in place of the integrator from the constructorcustomMaxNbOfEval
- custom maximum number of evaluations to use in place of the custom maximum number from the constructor- Returns:
- probability of collision
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compute
public <T extends CalculusFieldElement<T>> FieldProbabilityOfCollision<T> compute(T xm, T ym, T sigmaX, T sigmaY, T radius, FieldUnivariateIntegrator<T> customIntegrator, int customMaxNbOfEval)
Compute the probability of collision using arguments specific to the rotated encounter frame and custom numerical configuration.The rotated encounter frame is define by the initial encounter frame (defined in
ShortTermEncounter2DDefinition
) rotated by the rotation matrix which is used to diagonalize the combined covariance matrix.- Specified by:
compute
in classAbstractShortTermEncounter1DNumerical2DPOCMethod
- Type Parameters:
T
- type of the field element- Parameters:
xm
- other collision object projected position onto the collision plane in the rotated encounter frame x-axis (m)ym
- other collision object projected position onto the collision plane in the rotated encounter frame y-axis (m)sigmaX
- square root of the x-axis eigen value of the diagonalized combined covariance matrix projected onto the collision plane (m)sigmaY
- square root of the y-axis eigen value of the diagonalized combined covariance matrix projected onto the collision plane (m)radius
- sum of primary and secondary collision object equivalent sphere radii (m)customIntegrator
- custom integrator to use in place of the integrator from the constructorcustomMaxNbOfEval
- custom maximum number of evaluations to use in place of the custom maximum number from the constructor- Returns:
- probability of collision
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getType
public ShortTermEncounter2DPOCMethodType getType()
Get type of the method.- Returns:
- type of the method
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