Class HarmonicAccelerationModel

    • Constructor Detail

      • HarmonicAccelerationModel

        public HarmonicAccelerationModel​(String prefix,
                                         AbsoluteDate referenceDate,
                                         double fundamentalPeriod,
                                         int harmonicMultiplier)
        Simple constructor.
        Parameters:
        prefix - prefix to use for parameter drivers
        referenceDate - reference date for computing polynomials, if null the reference date will be automatically set at propagation start
        fundamentalPeriod - fundamental period (typically set to initial orbit Keplerian period)
        harmonicMultiplier - multiplier to compute harmonic period from fundamental period)
    • Method Detail

      • init

        public void init​(SpacecraftState initialState,
                         AbsoluteDate target)
        Initialize the acceleration model at the start of the propagation.

        The default implementation of this method does nothing

        Specified by:
        init in interface AccelerationModel
        Parameters:
        initialState - spacecraft state at the start of propagation.
        target - date of propagation. Not equal to initialState.getDate().
      • signedAmplitude

        public double signedAmplitude​(SpacecraftState state,
                                      double[] parameters)
        Compute the signed amplitude of the acceleration.

        The acceleration is the direction multiplied by the signed amplitude. So if signed amplitude is negative, the acceleratin is towards the opposite of the direction specified at construction.

        Specified by:
        signedAmplitude in interface AccelerationModel
        Parameters:
        state - current state information: date, kinematics, attitude
        parameters - values of the force model parameters
        Returns:
        norm of the acceleration
      • signedAmplitude

        public <T extends CalculusFieldElement<T>> T signedAmplitude​(FieldSpacecraftState<T> state,
                                                                     T[] parameters)
        Compute the signed amplitude of the acceleration.

        The acceleration is the direction multiplied by the signed amplitude. So if signed amplitude is negative, the acceleratin is towards the opposite of the direction specified at construction.

        Specified by:
        signedAmplitude in interface AccelerationModel
        Type Parameters:
        T - type of the elements
        Parameters:
        state - current state information: date, kinematics, attitude
        parameters - values of the force model parameters
        Returns:
        norm of the acceleration