Sagem Defense Securite

Safran Electronics & Defense

Jean-Claude Goudon

Charlie Vacher

Simon Gavillet

Guillaume Ibanez

According to a first aspect, the invention relates to a method for controlling the navigation system of a carrier (P) receiving signals from a plurality of transmitters (T-T) and capable of measuring a pseudo-distance to each transmitter, wherein the elevation of each of the transmitters (T-T) is controlled relative to the horizontal (H) of the carrier (P), and a navigation solution is developed from the pseudo-distances (Pd-a) for which the elevation of the corresponding transmitter is higher than a minimum elevation (Em), characterized in that it comprises carrying out a discrimination of the multiple routes from the pseudo-distances (formula I) measured for the transmitters (T) having an elevation lower than the minimum elevation (Em), and further retaining, during the development of the navigation solution, the pseudo-distances (Pd-ad) authorized after said discrimination. The invention also relates to a navigation system capable of implementing the method according to the first aspect of the invention.

Method and system for detecting multiple paths in a system of satellite navigation

A method of managing additional filters in a navigation system fitted to a vehicle, the system acting, during a journey of the vehicle, to deliver at least one position of the vehicle by using a main filter for merging data coming from a constellation of visible satellites present above a vehicle horizon, each additional filter excluding data coming from one of the satellites in order to obtain a corrected position in the event of failure of the excluded satellite. The steps including from a position of the vehicle, determining a theoretical constellation of satellites present above the horizon; and for each satellite present in the theoretical constellation, creating and maintaining an additional filter excluding that satellite.

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Paris, France

Jean-Claude Goudon