Safran Electronics & Defense

Loïc Davain

Clément Misandeau

Simon Fabien

Kévin Honore

Julien Nguyen

A method for statistically correcting the estimation of the state X of a system, the state X including a physical quantity, correcting the estimation of this state X being carried out on the basis of a plurality of observations Yrelating to this state X, each observation being obtained by a different measurement relating to at least one physical quantity, the method being implemented by a device including a calculator, the method including determining for each observation Y, the difference between the observation Yand the estimated state referred to as innovation Z, using the relationship Z=Y−HX where H is the observation matrix associated with the statistical filter considered; associating an ordering parameter with each observation Y, the ordering parameter being given by the relationship Ord=|Z−Z| where Zis a predetermined reference value; classifying the measurements in ascending order of the ordering parameter associated therewith; and correcting errors on the estimations using the statistical filter.

Method for statistically correcting the estimation of the state of a system and device therefor

A method for navigating a carrier using a Kalman filter estimating a navigation state of a carrier, comprising: obtaining, from a signal transmitted by the satellite and subsequently received by the carrier, a delta range measured between the carrier and a satellite and another measured kinematic datum which is associated with the satellite, generating, from position data for the carrier and the satellite in the navigation state, an estimated delta range between the carrier and the satellite, calculating, using the delta ranges, a delta range innovation associated with the satellite, carrying out a test on the delta range innovation, the test result indicating whether or not the signal was a multi-path signal, using, by means of the filter, the kinematic datum as an observation to update the navigation state provided that the test result indicates that the signal was not a multi-path signal.

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MOISSY-CRAMAYEL, France

Loïc Davain