Safran Electronics & Defense

Sagem Defense Securite

Alain Chiodini

François Dufresne De Virel

Denis Delville

Christophe Guettier

Sylvain Pouillard

Francois Dufresne De Virel

Jacques Yelloz

Philippe Riviere

Patrick Sechaud

Michel Gillet

Laurent Widemont

Karim Jabri

Arnaud Rover

Pierre-Antoine Henry

Géraud Allard

A method for calibrating a receiver includes determining and correcting, for each analog reception channel other than a reference channel, a phase shift with the reference channel. The determining includes calculating an observed covariance matrix representative of a covariance between samples, collected in parallel on each of the analog reception channels over a period of time, of one or more incident reference radio signals on the multi-element antenna, obtaining an estimate of a reference covariance matrix representative of the covariance between samples of the incident radio signal(s) which would be collected in parallel on each of the analog reception channels over the period of time in the absence of phase shift between the analog reception channels, calculating a product matrix, resulting from a term-by-term matrix product of the observed covariance matrix with the estimate of the reference covariance matrix, and determining the argument of complex terms of the product matrix.

Method for calibrating a multi-channel radio receiver

A method () for characterising processing differences between analog channels, the method comprising injecting () three analog signals into a first analog channel and a second analog channel, digitising () these signals so as to obtain digital signals x, xand yhaving N samples, estimating () parameters γand δfrom the digital signals, where γis a ratio between an amplitude of the first analog signal at the output of the first analog channel and an amplitude of the second analog signal at the output of the second analog channel, and where δis a difference between a phase shift induced by the first analog channel in the first analog signal and a phase shift induced by the second analog channel in the second analog signal,

Method for characterising processing differences between several analog channels

The invention relates to an automatic assistance method for landing an aircraft on a landing runway, from a return point (A) to a completion point (PA) at which the aircraft comes into contact with the landing runway, implemented by a data-processing device on-board said aircraft and configured to be linked to an inertial unit, an altimeter and a deviation meter, said method comprising: &#x2014;guidance, based on position and attitude data provided by the inertia unit and altitude data provided by the altimeter, of the aircraft along a predefined trajectory from the return point (A) to a predetermined holding point (C) approximately aligned with the axis of the landing runway, the guidance been performed over at least one part of said predefined trajectory on the basis of corrected position data calculated using position data of the aircraft provided by the inertia unit and measurements transmitted by the deviation meter, &#x2014;guidance from the holding point (C) to the completion point (PA).

Automatic assistance method for landing an aircraft

The present invention relates to a method for automatically assisting with the landing of an aircraft on a runway from a return point (A) to a completion point (D), at which the aircraft touches the runway, by means of a data-processing device on-board said aircraft, which device is configured to be connected to an altimeter and a deviation meter, the method including: a return-navigation assistance phase including guidance of the aircraft, on the basis of measurements of the azimuth deviation of the aircraft relative to a reference direction linking said return point (A) and the position of the deviation meter (E) transmitted by said deviation meter, from the return point (A) towards the position of the deviation meter (E), determination of the position of the aircraft at a predetermined capture point (B) that is aligned with the return point (A) and the position of the deviation meter (E), and guidance of the aircraft along a predetermined path from the capture point (B) to a predetermined holding point (C), which is approximately aligned with the axis of the runway, on the basis of altitude data provided by the altimeter and heading and speed data relating to the aircraft, a landing assistance phase including guidance from the holding point (C) to the completion point (D).

Method for automatically assisting with the landing of an aircraft

A communication method in an ad hoc network, including a coordinating mobile communication device, referred to as the coordinator device, and a plurality of subordinate mobile communication devices, referred to as subordinate devices, each communication device including a wireless communication module and a positioning module using a transmission of first pulses modulated in accordance with a first ultra-wide band modulation in order to determine information representing a position of said communication device. The method includes, when it is implemented by a communication device: obtaining data to be transmitted; checking a transmission capability of the wireless communication module; when the wireless communication module does not allow to transmit the data, using the positioning module to transmit said data in the form of second pulses orthogonal to the first pulses.

Method for communication in an ad hoc network

There is proposed a method of in-flight transmission of data recorded by a black box of an aircraft (), the method comprising the emission () by the aircraft () of a radioelectric beam (F, F) transporting said data according to a first directivity (D) if at least one predetermined parameter does not indicate a critical state of the aircraft (), and according to a second directivity (D) different from the first directivity (D) if the predetermined parameter indicates a critical state of the aircraft ().

Method of transmitting flight data recorded by a black box of an aircraft by a radioelectric beam whose directivity changes if a critical state of the aircraft is detected

A method of positioning a group of subordinate communications units relative to a coordinating communications unit, the method comprising the following steps: the coordinating unit transmitting a specific identification table to each subordinate unit; each unit transmitting its UWB signature; each unit analyzing the received UWB signatures and determining the distances between that unit and each of the other units; each subordinate unit transmitting to the coordinating unit the distances between that subordinate unit and each of the other units; and the coordinating unit determining the relative positions of the subordinate units.

Method for geopositioning mobile units moving around inside a closed structure

The methods for managing access to a communication medium shared by a plurality of radio communication devices. The method of accessing a radio communication medium shared between a plurality of communication terminals. The method is based on a variant of the CSMA/CD access protocol. The method is based on monitoring of the medium and the emission of a token to request permission to emit. The terminals that receive this token then emit an acknowledgement intended to signal that the medium can be used, or a collision message if they receive a plurality of tokens simultaneously. In the latter case, the emitter retries its attempt to use the medium later on.

Growing community of inventors

Boulogne-Billancourt, France

Alain Chiodini