Sagem Defense Securite

Stanislas Szelewa

Sébastien Vourc'h

Thibault Lartigue

A method for determining protection limits at a future moment associated with navigation states of a bearer by estimating the navigation states of the bearer at the present moment, developing a statistic model of the estimation errors of navigation states of the bearer at the present moment in the form of a covariance matrix, extrapolating, for a future moment, the statistical model of the estimation errors, calculating protection limits at the future moment from the extrapolated statistical model, the extrapolation of the statistical model of the estimation errors implements the application of a constant and positive transition matrix to a standard deviation vector constructed from the square root of the elements of the diagonal of the covariance matrix, to propagate, up to the future moment, the standard deviations developed at the present moment. The invention also relates to a navigation system configured to implement the method.

Method and system for determining protection limits with integrated extrapolation over a given time horizon

The invention relates according to a first aspect to a hybridization device () comprising a virtual platform (), a bank () of Kalman filters each estimating a correction vector (dX0-dXn) comprising a plurality of components, said device formulating a hybrid output (SH) corresponding to inertial measurements (PPVI) calculated by the virtual platform () and corrected by a stabilization vector (dC) exhibiting one and the same plurality of components, characterized in that it comprises a correction formulation module () configured so as to formulate each of the components (dC[state]) of the stabilization vector (dC) as a function of all the corresponding components (dX0[state]-dXn[state]) of the correction vectors (dX0-dXn).

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Paris, France

Stanislas Szelewa