Thales

Dassault Systemes

Aluminium Pechiney

Thales Avionics S.a.

Nicolas Martin

Jean-Michel Perre

David Depraz

Vincent Chopard

Marc Revol

Denis Bouvet

Yves Clauzel

Hervé Guichon

Jacques Coatantiec

Christian Mehlen

Stéphane Rollet

Jean-Pierre Schlotterbeck

Xavier Lacondemine

Arnaud Nonclercq

Patrice Guillard

Christian Barthelemy

Jean-Luc Issler

Nicolas Vercier

Bruno Montagne

Bernard Fouilland

Gregory Baral-Baron

Franck Letestu

Bertrand Lesot

Nicolas Bastien

Jean-Ren&eacute; Chevalier

Franck Leteshi

Blandine Coatantiec

Daniel Millwood

Maxime Tessier

Muhammed Halep

Isabelle Leblanc

MGrégory Baral-Baron

A method for detecting masking of one or more satellites by an obstacle for a GNSS receiver on board a movable carrier, including receiving, for each one of M satellites, a code pseudo-distance measurement and a variation of carrier pseudo-distances, computing of a definite position of the receiver and a computed position of each satellite, detecting a masking of at least one satellite on the basis of the following operations: computing, at a computation instant and for each satellite, of a computed pseudo-distance and a pseudo-distance reconstructed at a previous time, and detecting masking of at least one satellite by analyzing a magnitude, called residue, computed by applying a least squares algorithm.

Method for detecting masking of one or more satellites, electronic detection device and associated computer program product

A method for calibrating the stiffness mismatch ΔK or quadrature Kxy of a vibrating angular sensor includes a resonator extending about two axes x and y defining a sensor frame xy, comprising a vibrating proof mass comprising two parts configured to vibrate in phase opposition; and detection, excitation, quadrature compensation and stiffness adjustment transducers; and a stiffness matrix Kin the wave frame; the method comprising steps of: A determining the electrical angle; B recovering a quadrature or stiffness term of the stiffness matrix Kin the wave frame, the term being a sum of functions in cos(iθ) and sin(iθ); C determining the amplitudes of the functions in cos(iθ) and sin(iθ); then D determining the stiffness mismatch ΔK or the quadrature Kxy, on the basis of the amplitudes.

Method for calibrating the difference in stiffness and/or quadrature of a vibrating inertial sensor

This detection method is carried out after a phase for acquiring a navigation signal during a convergence phase and comprises at least one of the following steps: &#x2014;determining a plurality of pilot channel periodic correlations and a plurality of data channel periodic correlations, and determining a first value as a function of these periodic correlations; &#x2014;determining a plurality of pilot channel partial correlations, and determining a second value as a function of these partial correlations; &#x2014;determining a plurality of shifted pilot channel correlations, and determining a third value as a function of these shifted pilot channel correlations. The convergence phase further comprises the step for determining a wrong synchronization when at least one of the first value, the second value, and the third value exceeds a predetermined threshold.

Detection method of a wrong synchronization of a receiver with a satellite, associated receiver and computer program product

A method and a function for checking the integrity of the processing of a radionavigation signal emitted by a satellite, the signal being received by a receiver comprising reception means and processing means, the processing means comprising a linear anti-interference filter, the integrity checking method comprising at least a first phase of detection of a risk of false lock-on comprising the following steps: a step of recovery of a nominal theoretical self-correlation function of the received signal not processed by the linear anti-interference filter; a step of determination of a mean theoretical self-correlation function of the signal received and processed by the linear anti-interference filter over a defined integration period; a step of determination of the number of local maxima of the modulus or of the modulus squared of the mean theoretical self-correlation function, a risk of false lock-on being detected if the number of local maxima is greater than or equal to two.

Method for checking the integrity of a satellite radionavigation signal

The invention concerns a satellite geopositioning method on the basis of satellites each transmitting dual-frequency signals. The method comprises, for each satellite, The position is estimated by using the corrected pseudo-distances computed for each satellite.

Satellite geopositioning method and associated terminal

A method for determining a wrong synchronization of a receiver with a satellite, associated receiver and computer program product, is implemented after the acquisition phase and includes the following steps:

Method for determining a wrong synchronization of a receiver with a satellite, associated receiver and computer program product

A receiver of signals likely to be disturbed by an interfering signal, the receiver includes an interference rejection filter comprising a multiplying gain applied respectively to an in-phase channel and an in-quadrature channel of a signal received by the receiver, the value of the multiplying gain being determined by a nonlinear function K(&#x3c1;) of the modulus &#x3c1; of the received signal, the function K(&#x3c1;) being determined so as to maximize the signal-to-noise ratio after application of the multiplying gain and demodulation of the received signal.

Receiver of signals, in particular of GNSS signals, comprising an interference rejection filter, and associated method

This determination method for determining a wrong synchronization including the steps of determining an ad hoc correlator corresponding to the value of correlation between the received signal and the local signal, and determining N additional correlators corresponding to the values of correlation between the received signal and an offset signal, each offset signal including a spreading code that is offset in relation to the local spreading code, and determining a value for the amount of inconsistency between the frequency of the local carrier wave and the frequency of the local spreading code; if the value of inconsistency is higher than a predetermined threshold value of inconsistency, determining a wrong synchronization; otherwise, determining an indicator of wrong synchronization as a function of the correlators determined, comparing the indicator of wrong synchronization with at least one threshold value, determining a wrong synchronization based on the result of the comparison.

Method for determining a wrong synchronization of a receiver with a satellite, associated module and computer program product

The invention relates to a device for receiving satellite radio-navigation signals comprising a plurality of receiving antennas forming an antenna array. The invention consists in using a plurality of antennas disposed around the circumference of a carrier and in demodulating the signals received by each antenna separately. The diversity of the demodulation chains is utilized to compensate the signal loss on one of the chains when the corresponding antenna experiences a signal loss due to the masking of the satellite by the carrier.

Multi-antenna radio-navigation signals reception device

The invention relates to a device for receiving satellite radio-navigation signals comprising a plurality of receiving antennas forming an antenna array. The invention consists in using a plurality of antennas disposed around the circumference of a carrier, in demodulating the signals received by each antenna separately and then in combining the various demodulated signals, thereby amounting to effecting a beam forming in an equivalent antenna pattern. The invention then requires only a single synchronization slaving for the set of demodulation pathways.

Device for receiving radio-navigation signals with multiple antennas and common synchronization slaving

An anemometry system comprising a laser source supplying an incident beam that is backscattered by passing through the incident beam mixing means for mixing the backscattered beam and a reference beam, creating an interferometry wave conversion means, converting the interferometry wave into an electrical signal proportional to the power of said wave first determination means, for determining a time-frequency diagram of said electrical signal. The system also comprises second determination means for determining spots of said diagram, each spot being a set of connected points of said diagram, having exceeded a detection threshold computation means for computing an average of the frequency, a duration and a slope characterizing the trend of the frequency as a function of time in the time-frequency diagram, and determination meansfor determining the air speed from all or part of said averages of the frequency, said durations and said slopes.

Laser anemometry system and method

The invention relates to a method for calibrating an antenna of a receiver of signals (s, . . . , s) originating from a plurality of sources, said receiver comprising a plurality of sensors (c, . . . , c), characterized in that it comprises the following steps:

Method and device for calibrating a receiver

The invention is directed to a method for designing a modeled object within a session of CAD system interacting with a database. The method comprises:

Designing a modeled object within a session of a computer-aided design system interacting with a database

A system for receiving an analogue signal e includes amplifying and digitizing the signal in order to obtain a digitized signal e, a power inversion module, the module determining an inversion gain g, this gain being applied to the digitized signal e, an automatic gain control AGC loop adapting the power of the signal e before digitization, the input signal of the AGC loop being a function of the inversion gain g.

Reception system including a mechanism countering pulsed interference

A system for receiving a radionavigation signal, notably in a jammed medium, emitted by a satellite of a satellite positioning system, includes: at least one first multi-correlator and at least one second multi-correlator disposed in parallel and operating respectively at a frequency; filtering means, disposed upstream of said multi-correlators; a delay line, disposed on the branch, between the filtering means and the second multi-correlator; means for sub-sampling at the frequency adapted for sub-sampling the signal transmitted directly and by branching with delay by the filtering means; and demodulation means eliminating the Doppler effect, disposed between the sub-sampling means and the first and second multi-correlators.

System and method for multi-correlation with modulation-adapted filter for the fast acquisition and the tracking of a radio navigation signal in the presence of jamming

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Bourg les Valence, France

Nicolas Martin