Sagem Defense Securite

Victor Mauger

Sébastien Vourc'h

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

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.

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Paris, France

Victor Mauger