Sagem Defense Securite

Sébastien Vourc'h

Victor Mauger

Stanislas Szelewa

Didler Riedinger

Didier Riedinger

Ghaleb Hoblos

Thibault Lartigue

According to a first aspect, the invention relates to a method for checking the integrity of position information output by a satellite (GNSS) positioning device () including a bank () of Kalman filters each producing a navigation solution (dX, dXi, dXn) from raw measurements of signals transmitted by the satellites, characterized in that the method comprises the steps of, for each filter in the bank: (i) correcting the navigation solution produced by the filter according to an estimate of the impact of a failure of a satellite on the navigation solution; (ii) calculating a cross-innovation reflecting the deviation between an observation corresponding to a raw measurement from a satellite not used by the filter and an a posteriori estimate of said observation from the navigation solution produced by the filter and corrected in accordance with step (i); and (iii) performing a statistical test of the cross-innovation in order to declare whether or not the satellite, the raw measurement of which is not used by the filter, is faulty.

Method and device for detecting and excluding multiple satellite failures in a GNSS system

A method for monitoring the integrity of position information outputted by a hybridization device that includes a bank () of Kalman filters, each filter developing a hybrid navigation solution from inertial measurements calculated by a virtual platform () and from raw measurements of signals transmitted by a satellite constellation which are outputted by a global navigation satellite system (GNSS). The method includes, for each satellite of the constellation of calculating a cross-innovation of the satellite that reflects the deviation between an observation, corresponding to a raw measurement from the satellite, and an a posteriori estimation of said observation that is developed through a Kalman filter and does not use the raw measurement from the satellite; carrying out a statistical test of the cross-innovation to ascertain whether or not the satellite is malfunctioning.

Method and device for detecting and excluding satellite malfunctions in a hybrid INS/GNSS system

A process for determination of navigation parameters of a carrier by a hybridisation device comprising a bank () of Kalman filters, each working out a hybrid navigation solution from inertial measurements calculated by a virtual platform () and raw measurements of signals emitted by a constellation of satellites supplied by a satellite-positioning system (GNSS), characterised in that it comprises the steps of:

Method of determining navigation parameters for a carrier and hybridization device associated with Kalman filter bank

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).

Integrated closed-loop hybridization device built in by construction

The invention relates according to a first aspect to a hybridization device () comprising a virtual platform () calculating inertial measurements (PPVI), a bank () of Kalman filters each formulating a hybrid navigation solution on the basis of the inertial measurements of the virtual platform () and of measurements of signals emitted by a constellation of satellites, which measurements are delivered by a satellite positioning system (GNSS), characterized in that it comprises, for each filter of the bank, a module for correcting the satellite measurements () delivering to the filter the measurements of the satellite positioning system (GNSS) which are used by the filter after correction with the aid of the hybrid navigation solution formulated by the filter.

Growing community of inventors

Paris, France

Sébastien Vourc'h