Package org.orekit.propagation.numerical

Interface TimeDerivativesEquations

public interface TimeDerivativesEquations
Interface summing up the contribution of several forces into orbit and mass derivatives.

The aim of this interface is to gather the contributions of various perturbing forces expressed as accelerations into one set of time-derivatives of Orbit plus one mass derivatives. It implements Gauss equations for different kind of parameters.

An implementation of this interface is automatically provided by integration-based propagators, which are either semi-analytical or numerical propagators.

Author:
Luc Maisonobe, Fabien Maussion, Véronique Pommier-Maurussane
See Also:

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    addKeplerContribution(double mu)
    Add the contribution of the Kepler evolution.
    void
    addMassDerivative(double q)
    Add the contribution of the flow rate (dm/dt).
    void
    addNonKeplerianAcceleration(Vector3D gamma)
    Add the contribution of a non-Keplerian acceleration.

  • Method Details

    • addKeplerContribution

      void addKeplerContribution(double mu)
      Add the contribution of the Kepler evolution.

      Since the Kepler evolution is the most important, it should be added after all the other ones, in order to improve numerical accuracy.

      Parameters:
      mu - central body gravitational constant

    • addNonKeplerianAcceleration

      void addNonKeplerianAcceleration(Vector3D gamma)
      Add the contribution of a non-Keplerian acceleration.
      Parameters:
      gamma - acceleration vector in the same inertial frame the spacecraft state is defined in (m/s²)
      Since:
      9.0

    • addMassDerivative

      void addMassDerivative(double q)
      Add the contribution of the flow rate (dm/dt).
      Parameters:
      q - the flow rate, must be negative (dm/dt)
      Throws:
      IllegalArgumentException - if flow-rate is positive