Thales

Daniel Jahan

Cédric Cornu

Jean-Michel Quellec

Daniel Christien

Jean-Paul Artis

Romain Giacometti

Pascal Cornic

Patrick Garrec

Thierry Mazeau

Stéphane Formont

Benoît Gorisse

Bernard Perpere

Loïc Menager

Clémentine Bauche-Costes

Nicolas Breuil

Vincent Guardia

Jean-Marie Boulangey

Patrick Chapuis

Patrick Borrel

The present invention relates to an amplitude goniometer comprises P receiver channels, P being greater than or equal to 2, each receiver channel being identified by an index p, each receiver channel comprising an antenna coupled to a receiver chain followed by at least two digital receiver modules each comprising an analogue-to-digital conversion module associated with a respective sampling frequency, each sampling frequency not complying with the Shannon criterion and not being a multiple of another frequency, N being the number of frequencies, N being greater than or equal to 2, each frequency being referenced by an index n, the amplitude goniometry estimator working from the amplitudes of the signals originating from at least Q adjacent receiver channels of the P receiver channels, Q being at most equal to P, the sampling frequencies being associated with the analogue-to-digital conversion modules of the Q adjacent receiver channels.

Amplitude goniometer and associated platform

A device for the radio stimulation of an antenna includes at least one transmission sub-assembly formed by an array of radiating elements and an array of photoelectric receivers; as well as a generator that synthesizes a set of electrical signals that are intended to excite each radiating element. The electrical signals are transmitted to the transmission sub-assembly in the form of modulated light waves that are multiplexed to form a composite laser beam that illuminates the array of photoelectric receivers. Each of the photoelectric receivers receives a light wave. The array of photoelectric sensors and the array of radiating elements have substantially identical arrangements. Each photoelectric receiver is connected to a radiating element in its array at a position identical to the one that said receiver occupies within its own or a position symmetrical thereto.

Device for radioelectric stimulation by self-referenced radiant panel

A stimulation device notably for testing radio reception devices is provided. It includes a signal generator delivering an amplitude-phase law for beam-forming purposes, transmitted in the form of a composite laser beam which illuminates a matrix of photodiodes of an emission subassembly with active modules separate from the generator, each wavelength of the beam carrying one of the signals defining the amplitude-phase law, intended for an active module. The device comprises means for measuring the orientation of the composite laser beam relative to the matrix of photodiodes of the emission subassembly and the distance traveled by the beam thereto, and correcting the phase law generated by the signal generator so as to neutralize the stray phase-shifts induced by these parameters on the signals transmitted to the emission subassembly.

Radiant-panel radio stimulation device

The invention relates to a method for testing the electromagnetic compatibility of a radar detector with at least one onboard pulse signal transmitter, wherein said radar detector and each onboard transmitter are part of the same platform, by means of eliminating the external echo component in the signals received by the radar detector, said method comprising a training phase allowing the detected pulses to be divided into classes, grouping together the pulses for which at least two characteristics have a common range of values, and a phase of eliminating the pulses that belong to the selected classes.

Method for testing the electromagnetic compatibility of a radar detector with at least one onboard pulse signal transmitter

The invention relates to a method and a device for estimating an angle of arrival of an incident radio signal in relation to a predetermined reference direction by using a set of N receiving paths comprising at least one directional antenna pointing in N different receiving directions, wherein only one sub-set of at least two receiving paths with adjacent antenna directions in said set of antennas delivers a measured power at reception. The device comprises modules suitable for: determining a number of receiving paths delivering a measured power forming said sub-set, and a reference index corresponding to a first receiving path in a direction in which extends the set of antenna directions of said sub-set; selecting the measured powers and obtaining a value to attribute to the non-measured powers to form a completed power signal; by applying a discrete Fourier transform (DFT) to said completed power signal, calculating at least one transformed value among the transformed values corresponding to a first, second, and third frequency line of the DFT; and, using the transformed value(s), applying an estimator of the angle of arrival, depending on the reference index.

Method and device for estimating an angle of arrival of an incident radio signal

The invention relates to a method for testing the electromagnetic compatibility of a radar detector with at least one onboard pulse signal transmitter, wherein said radar detector and each onboard transmitter are part of the same platform, by means of eliminating the onboard component in the signals received by said radar detector, where the onboard component corresponds to the mix of the direct component and the reflected component onboard, said method comprising a training phase allowing the detected pulses to be divided into classes, grouping together the pulses for which at least two characteristics have a common range of values, and a phase of eliminating the pulses that belong to the selected classes.

The invention relates to a method for testing the electromagnetic compatibility of a radar detector with at least one onboard pulse signal transmitter, wherein said radar detector and each onboard transmitter are part of the same platform, by means of eliminating the onboard component in the signals received by said radar detector, where the onboard component corresponds to the mix of the direct component and the reflected component onboard, said method comprising a training phase allowing the detected pulses to be divided into classes, grouping together the pulses for which at least two characteristics have a common range of values, and a phase of eliminating, the pulses that belong to the selected classes.

The invention relates to a method for determining features of an electromagnetic wave received by a reception system (), the reception system () comprising at least two reception channels (), each reception channel () comprising an antenna () and a reception chain (), each reception chain () being capable of delivering a value representative of the power delivered by the corresponding antenna () after reception of the wave by the reception system (), the features comprising at least the direction of arrival of the received wave, the method comprising a step of providing a measurement vector,

Method for determining features of an electromagnetic wave

The present invention relates to a method for locating sources emitting electromagnetic pulses, each source belonging to a carrier platform, the method comprising the following steps: The method further comprises the following steps:

Method for locating sources emitting electromagnetic pulses

The invention relates to a method for locating at least two sources emitting electromagnetic pulses in an environment comprising two reflectors. The method comprises receiving, by a detector, for each source to be located, at least one same emitted pulse, received directly from said source and received by reflection on one of the reflectors. The method further comprises:

Method for locating electromagnetic pulse emission sources in an environment including reflectors

Methods for locating electromagnetic pulse emission sources in an environment including reflectors is disclosed. In one aspect, the method includes receiving, by a detector, for each source to be located, at least one same emitted pulse, received directly from said source and received by reflection on one of the reflectors. The method also includes identifying direct subsets and reflected subsets, regrouping by pairs of direct subsets with reflected subsets, calculating, for each pair, differences in dates of arrival between the pulses of the reflected subset and the pulses of the direct subset of the pair, and determining the distance of each source from the detector from calculated differences in dates of arrival of the pulses of each pair.

A radar includes an antennal structure, with means for transmitting an impulse signal in a band centered on F1 according to a repetition period centered on a recurrence period Tr1 and pulse width T1, with means for receiving signals by the antenna in frequency band &#x394;F, with a unit for processing the signals received on a set of N distance bins. The signals received are transmitted by another radar in a frequency band centered on F2 where F2&#x2212;F1&#x2266;&#x394;F, according to a repetition period centered on a period Tr2 and pulse width T2. The signals transmitted by the two radars are asynchronous. The method comprises: slaving frequency F1 to frequency F2, by measuring the power received integrated over the N distance bins and over several recurrences, determination of period Tr2 and T2 and slaving the period centered on Tr1 to a period centered on Tr2 with Tr1=k*Tr2.

Method of radar surveillance and of radar signal acquisition

A reception system including a receiver coupled to a processing means, the receiver comprising a number N of antennas, each being able to pick up signals representative of incident waves and to deliver a pulse dependent on said signal, N being an integer. Said receiver includes: N delay lines respectively coupled to each of said N antennas, each delay line being able to delay the signal delivered by the antenna with which it is associated by its own time delay, a coupling means able to sum the N signals delivered by the N delay lines, so as to deliver an output signal comprising a series of N time-shifted pulses. The processing means includes a measurement means able to measure the signal delivered by the coupling means and to deliver as output a signal formed by measurement samples, representative of the N pulses delivered by the N antennas.

Multi-channel reception system

A device is provided for use of an antennal base formed of two antennas which pick up the emissions present and produce two radioelectric signals S1 and S2. These two signals are used to produce at least one intermediate-frequency signal Fl by demodulation of one of the two signals by the other (autotransposition). The demodulation is carried out by firstly transposing one of the signals, S1 for example, around a given frequency F1, the signal S2 being preserved around its initial central frequency F. Thus, whatever the central frequency Fof the emission picked up by the antennas, the demodulation produces a signal of central frequency F, thereafter demodulated into a given intermediate frequency Fl by a local oscillator of constant frequency F2=F1+Fl. The device is applied to the production of a device for detecting emissions and for characterizing the emissions picked up.

Device for broadband reception by autotransposition and application to the detection and characterization of radioelectric emissions

A reception system including a receiver of superheterodyne type coupled to a processing means, the receiver including N antennas. Said receiver includes: N translation means, each being able to frequency translate signals delivered by the antenna considered, from a frequency sub-band of the span of interest to a restricted frequency band, and to frequency multiplex the signals belonging to said frequency sub-band; N first intermediate frequency bandpass filters, of bandwidth equal to said restricted frequency band, respectively coupled at the output of each translation means, and able to filter the translated and multiplexed signals; a coupling means able to sum the N filtered signals so as to deliver the set of summed signals via N outputs. The processing means includes N other translation means coupled to N other intermediate frequency bandpass filters of frequency bandwidth equal to L, themselves coupled to N spectral analyzers, all having the same restricted analysis frequency band of width L, each other translation means of rank i, i being an integer varying from 1 to N, being able to transpose the signals delivered by the coupling means with the aid of a translation signal having a frequency adapted to each other translation means, in such a way that the other intermediate frequency bandpass filter connected at the output of said other translation means, is able to filter the ith sub-band of the total frequency band of width L&#xb7;N, to which the signals summed by the coupling means belong.

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Brest, France

Daniel Jahan