Class AbstractCovarianceMatrixProvider

    • Constructor Detail

      • AbstractCovarianceMatrixProvider

        protected AbstractCovarianceMatrixProvider​(org.hipparchus.linear.RealMatrix initialNoiseMatrix)
        Simple constructor.
        Parameters:
        initialNoiseMatrix - initial process noise
    • Method Detail

      • getInitialCovarianceMatrix

        public org.hipparchus.linear.RealMatrix getInitialCovarianceMatrix​(SpacecraftState initial)
        Get the initial covariance matrix.

        The initial covariance matrix is a covariance matrix corresponding to the parameters managed by the Kalman estimator. The number of rows/columns and their order are as follows:

        • The first 6 components correspond to the 6 orbital parameters of the associated propagator. All 6 parameters must always be present, regardless of the fact they are estimated or not.
        • The following components correspond to the subset of propagation parameters of the associated propagator that are estimated.
        • The remaining components correspond to the subset of measurements parameters that are estimated, considering all measurements, even the ones that correspond to spacecrafts not related to the associated propagator

        In most cases, the initial covariance matrix will be the output matrix of a previous run of the Kalman filter.

        Specified by:
        getInitialCovarianceMatrix in interface CovarianceMatrixProvider
        Parameters:
        initial - initial state state
        Returns:
        physical (i.e. non normalized) initial covariance matrix
        See Also:
        PropagatorBuilder.getOrbitalParametersDrivers(), PropagatorBuilder.getPropagationParametersDrivers()