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

Class HansenUtilities

java.lang.Object
org.orekit.propagation.semianalytical.dsst.utilities.hansen.HansenUtilities
public class HansenUtilities extends Object
Utilities class.
Author:
Lucian Barbulescu

  • Field Details

  • Method Details

    • buildIdentityMatrix2

      public static PolynomialFunctionMatrix buildIdentityMatrix2()
      Build the identity matrix of order 2. 
             / 1   0 \
  I₂ = |       |
       \ 0   1 /
      Returns:
      the identity matrix of order 2

    • buildZeroMatrix2

      public static PolynomialFunctionMatrix buildZeroMatrix2()
      Build the empty matrix of order 2. 
             / 0   0 \
  E₂ = |       |
       \ 0   0 /
      Returns:
      the identity matrix of order 2

    • buildIdentityMatrix4

      public static PolynomialFunctionMatrix buildIdentityMatrix4()
      Build the identity matrix of order 4. 
             / 1  0  0  0 \
       |            |
       | 0  1  0  0 |
  I₄ = |            |
       | 0  0  1  0 |
       |            |
       \ 0  0  0  1 /
      Returns:
      the identity matrix of order 4

    • buildZeroMatrix4

      public static PolynomialFunctionMatrix buildZeroMatrix4()
      Build the empty matrix of order 4. 
             / 0  0  0  0 \
       |            |
       | 0  0  0  0 |
  E₄ = |            |
       | 0  0  0  0 |
       |            |
       \ 0  0  0  0 /
      Returns:
      the identity matrix of order 4

    • generateZonalPolynomials

      public static void generateZonalPolynomials(int n0, int nMin, int offset, int slice, int s, PolynomialFunction[][] mpvec, PolynomialFunction[][] mpvecDeriv)
      Generate the polynomials needed in the linear transformation.
      Parameters:
      n0 - the index of the initial condition, Petre's paper
      nMin - rhe minimum value for the order
      offset - offset used to identify the polynomial that corresponds to a negative value of n in the internal array that starts at 0
      slice - number of coefficients that will be computed with a set of roots
      s - the s coefficient
      mpvec - array to store the first vector of polynomials associated to Hansen coefficients and derivatives.
      mpvecDeriv - array to store the second vector of polynomials associated only to derivatives.

      See Petre's paper

    • generateTesseralPolynomials

      public static void generateTesseralPolynomials(int n0, int nMin, int offset, int slice, int j, int s, PolynomialFunction[][] mpvec, PolynomialFunction[][] mpvecDeriv)
      Generate the polynomials needed in the linear transformation.
      Parameters:
      n0 - the index of the initial condition, Petre's paper
      nMin - rhe minimum value for the order
      offset - offset used to identify the polynomial that corresponds to a negative value of n in the internal array that starts at 0
      slice - number of coefficients that will be computed with a set of roots
      j - the j coefficient
      s - the s coefficient
      mpvec - array to store the first vector of polynomials associated to Hansen coefficients and derivatives.
      mpvecDeriv - array to store the second vector of polynomials associated only to derivatives.

    • generateThirdBodyPolynomials

      public static void generateThirdBodyPolynomials(int n0, int nMax, int slice, int s, PolynomialFunction[][] mpvec, PolynomialFunction[][] mpvecDeriv)
      Generate the polynomials needed in the linear transformation.
      Parameters:
      n0 - the index of the initial condition, Petre's paper
      nMax - the maximum order of n indexes
      slice - number of coefficients that will be computed with a set of roots
      s - the s coefficient
      mpvec - array to store the first vector of polynomials associated to Hansen coefficients and derivatives.
      mpvecDeriv - array to store the second vector of polynomials associated only to derivatives.

      See Petre's paper