Package org.orekit.forces.gravity

Class Relativity

  • All Implemented Interfaces:
    ForceModel, EventDetectorsProvider, ParameterDriversProvider
    public class Relativity
extends Object
implements ForceModel
    Post-Newtonian correction force due to general relativity. The main effect is the precession of perigee by a few arcseconds per year.

    Implemented from Montenbruck and Gill equation 3.146.

    Author:
    Evan Ward
    See Also:
    "Montenbruck, Oliver, and Gill, Eberhard. Satellite orbits : models, methods, and applications. Berlin New York: Springer, 2000."

    • Constructor Detail

      • Relativity

        public Relativity​(double gm)
        Create a force model to add post-Newtonian acceleration corrections to an Earth orbit.
        Parameters:
        gm - Earth's gravitational parameter.

    • Method Detail

      • dependsOnPositionOnly

        public boolean dependsOnPositionOnly()
        Check if force model depends on position only at a given, fixed date.
        Specified by:
        dependsOnPositionOnly in interface ForceModel
        Returns:
        true if force model depends on position only, false if it depends on velocity, either directly or due to a dependency on attitude

      • acceleration

        public Vector3D acceleration​(SpacecraftState s,
                             double[] parameters)
        Compute acceleration.
        Specified by:
        acceleration in interface ForceModel
        Parameters:
        s - current state information: date, kinematics, attitude
        parameters - values of the force model parameters at state date, only 1 value for each parameterDriver
        Returns:
        acceleration in same frame as state

      • acceleration

        public <T extends CalculusFieldElement<T>> FieldVector3D<T> acceleration​(FieldSpacecraftState<T> s,
                                                                         T[] parameters)
        Compute acceleration.
        Specified by:
        acceleration in interface ForceModel
        Type Parameters:
        T - type of the elements
        Parameters:
        s - current state information: date, kinematics, attitude
        parameters - values of the force model parameters at state date, only 1 value for each parameterDriver
        Returns:
        acceleration in same frame as state