org.orekit.propagation.semianalytical.dsst.utilities.hansen

Class FieldHansenTesseralLinear<T extends RealFieldElement<T>>

java.lang.Object

org.orekit.propagation.semianalytical.dsst.utilities.hansen.FieldHansenTesseralLinear<T>

public class FieldHansenTesseralLinear<T extends RealFieldElement<T>>
extends Object

Hansen coefficients K(t,n,s) for t!=0 and n < 0.

Implements Collins 4-236 or Danielson 2.7.3-(9) for Hansen Coefficients and Collins 4-240 for derivatives. The recursions are transformed into composition of linear transformations to obtain the associated polynomials for coefficients and their derivatives - see Petre's paper

Author:

Petre Bazavan, Lucian Barbulescu, Bryan Cazabonne

Constructor Summary

Constructors

Constructor and Description
FieldHansenTesseralLinear(int nMax, int s, int j, int n0, int maxHansen, Field<T> field) Constructor.

Method Summary

Modifier and Type	Method and Description
void	computeInitValues(T e2, T chi, T chi2) Compute the values for the first four coefficients and their derivatives by means of series.
T	getDerivative(int mnm1, T chi) Compute the value of the derivative dKj-n-1, s / de².
T	getValue(int mnm1, T chi) Compute the value of the Hansen coefficient Kj-n-1, s.

Methods inherited from class java.lang.Object

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

Constructor Detail

FieldHansenTesseralLinear

public FieldHansenTesseralLinear(int nMax,
                                 int s,
                                 int j,
                                 int n0,
                                 int maxHansen,
                                 Field<T> field)

Constructor.

Parameters:

nMax - the maximum (absolute) value of n parameter

s - s parameter

j - j parameter

n0 - the minimum (absolute) value of n

maxHansen - maximum power of the eccentricity to use in Hansen coefficient Kernel expansion.

field - field used by default

Method Detail

computeInitValues

public void computeInitValues(T e2,
                              T chi,
                              T chi2)

Compute the values for the first four coefficients and their derivatives by means of series.

Parameters:

e2 - e²

chi - Χ

chi2 - Χ²

getValue

public T getValue(int mnm1,
                  T chi)

Compute the value of the Hansen coefficient K_j^{-n-1, s}.

Parameters:

mnm1 - -n-1

chi - χ

Returns:

the coefficient K_j^{-n-1, s}

getDerivative

public T getDerivative(int mnm1,
                       T chi)

Compute the value of the derivative dK_j^{-n-1, s} / de².

Parameters:

mnm1 - -n-1

chi - χ

Returns:

the derivative dK_j^{-n-1, s} / de²