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

Class HansenZonalLinear

java.lang.Object
org.orekit.propagation.semianalytical.dsst.utilities.hansen.HansenZonalLinear
public class HansenZonalLinear extends Object
Hansen coefficients K(t,n,s) for t=0 and n < 0.

Implements Collins 4-242 or echivalently, Danielson 2.7.3-(6) for Hansen Coefficients and Collins 4-245 or Danielson 3.1-(7) 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

  • Constructor Details

    • HansenZonalLinear

      public HansenZonalLinear(int nMax, int s)
      Constructor.
      Parameters:
      nMax - the maximum (absolute) value of n coefficient
      s - s coefficient

  • Method Details

    • computeInitValues

      public void computeInitValues(double chi)
      Compute the roots for the Hansen coefficients and their derivatives.
      Parameters:
      chi - 1 / sqrt(1 - e²)

    • getValue

      public double getValue(int mnm1, double chi)
      Get the K₀-n-1,s coefficient value.

      The s value is given in the class constructor

      Parameters:
      mnm1 - (-n-1) coefficient
      chi - The value of χ
      Returns:
      K₀-n-1,s

    • getDerivative

      public double getDerivative(int mnm1, double chi)
      Get the dK₀-n-1,s / dΧ coefficient derivative.

      The s value is given in the class constructor.

      Parameters:
      mnm1 - (-n-1) coefficient
      chi - The value of χ
      Returns:
      dK₀-n-1,s / dΧ