Package org.orekit.ssa.collision.shorttermencounter.probability.twod

Class AbstractAlfriend1999

java.lang.Object

org.orekit.ssa.collision.shorttermencounter.probability.twod.AbstractShortTermEncounter2DPOCMethod

org.orekit.ssa.collision.shorttermencounter.probability.twod.AbstractAlfriend1999

All Implemented Interfaces:

ShortTermEncounter2DPOCMethod

Direct Known Subclasses:

Alfriend1999, Alfriend1999Max

public abstract class AbstractAlfriend1999
extends AbstractShortTermEncounter2DPOCMethod

Abstract class for Alfriend1999 normal and maximised methods as they share lots of similarities.

Since:

12.0

Author:

Vincent Cucchietti

Field Summary

Fields inherited from class org.orekit.ssa.collision.shorttermencounter.probability.twod.AbstractShortTermEncounter2DPOCMethod

DEFAULT_TCA_DIFFERENCE_TOLERANCE

Fields inherited from interface org.orekit.ssa.collision.shorttermencounter.probability.twod.ShortTermEncounter2DPOCMethod

DEFAULT_ZERO_THRESHOLD

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AbstractAlfriend1999(String name)	Default constructor.

Method Summary

Modifier and Type	Method	Description
ProbabilityOfCollision	compute(double xm, double ym, double sigmaX, double sigmaY, double radius)	Compute the probability of collision using arguments specific to the rotated encounter frame.
<T extends CalculusFieldElement<T>> FieldProbabilityOfCollision<T>	compute(T xm, T ym, T sigmaX, T sigmaY, T radius)	Compute the probability of collision using arguments specific to the rotated encounter frame.

Methods inherited from class org.orekit.ssa.collision.shorttermencounter.probability.twod.AbstractShortTermEncounter2DPOCMethod

compute, compute, compute, compute, compute, compute, getName, getObjectOrbitFromCdm, getObjectStateCovarianceFromCdm, isAMaximumProbabilityOfCollisionMethod

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.orekit.ssa.collision.shorttermencounter.probability.twod.ShortTermEncounter2DPOCMethod

compute, compute, compute, compute, compute, compute, compute, compute, compute, getType

Constructor Detail

AbstractAlfriend1999

protected AbstractAlfriend1999(String name)

Default constructor.

Parameters:

name - name of the method

Method Detail

compute

public ProbabilityOfCollision compute(double xm,
                                      double ym,
                                      double sigmaX,
                                      double sigmaY,
                                      double radius)

Compute the probability of collision using arguments specific to the rotated encounter frame.

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 interface ShortTermEncounter2DPOCMethod

Specified by:

compute in class AbstractShortTermEncounter2DPOCMethod

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)

Returns:

probability of collision

compute

public <T extends CalculusFieldElement<T>> FieldProbabilityOfCollision<T> compute(T xm,
                                                                                  T ym,
                                                                                  T sigmaX,
                                                                                  T sigmaY,
                                                                                  T radius)

Compute the probability of collision using arguments specific to the rotated encounter frame.

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 interface ShortTermEncounter2DPOCMethod

Specified by:

compute in class AbstractShortTermEncounter2DPOCMethod

Type Parameters:

T - type of the field elements

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)

Returns:

probability of collision