Abstract: The invention relates to the general field of complex electronic and/or computerized system architectures for which the interchanges take the form of irregular data flows prompted by processing functions of variable duration in time. The object of the invention is an architecture designed for electronic systems having a plurality of processing nodes in which each node provides a function or part of a function implemented by the system. This architecture is based on one single synchronization link which supplies all the modules with a common synchronization message containing synchronization information and a simplified header. There are a plurality of asynchronous data interchange links. Each link allows a message interchange between two specific processing nodes, with the interchanged messages having data to be processed, accompanied by a generic header. The asynchronous links' generic header includes all the information relating to the system's operating step to which the interchanged data refer.

Abstract: The present invention relates to the field active electronic scanning radar systems. It provides an architecture for active antenna radar based on a functional unit, the elementary radar unit. The elementary radar unit comprises all of the functions required for generating N independent radar channels. In this regard, it comprises a radiating face with N radiating elements and means for independently generating the radar waves emitted by each of the radiating elements and all of the functions for receiving the waves picked up by this radiating element, together with the digitization of the video signal obtained after reception. It also comprises local digital processing means allowing the digital signals coming from the N channels to be jointly processed.

Abstract: The invention relates to the general field of complex electronic and/or computerized system architectures for which the interchanges take the form of irregular data flows prompted by processing functions of variable duration in time. The object of the invention is an architecture designed for electronic systems having a plurality of processing nodes in which each node provides a function or part of a function implemented by the system. This architecture is based on one single synchronization link which supplies all the modules with a common synchronization message containing synchronization information and a simplified header. There are a plurality of asynchronous data interchange links. Each link allows a message interchange between two specific processing nodes, with the interchanged messages having data to be processed, accompanied by a generic header. The asynchronous links' generic header includes all the information relating to the system's operating step to which the interchanged data refer.

Abstract: The present invention relates to a process for the phase amplitude demodulation of a received radar signal and to an implementing device, the process consisting in sampling the intermediate frequency signal at a sampling frequency fe such that fe is equal to &agr;B, &agr; being a number greater than or equal to 2 and B being the width of the pass-band, the intermediate frequency fi and the sampling frequency being in a ratio such that fi=(k±¼)fe, k being an integer. Application to coherent detection radars.

Abstract: A transmission method and a transmitter and receiver Structure is disclosed which provides for transmission of modulated waves using long pulses with a plurality of frequencies. The method involves two consecutive frequencies being separated by 1/T, where T is the period of the useful transmission intervals. The method and the apparatus are particularly suited to broadcasting and reception of television and radio signals as well as telephone communications between exchanges and between radio telephones and communication stations including terrestrial stations and satellites and local computer networks. Most particularly the method is applicable to high fidelity radio transmissions as well as to high definition television (HDTV).

Abstract: A device and a method for the transmission or storage of data optimizing the use of the pass-band. Also, a method for transmission by phase modulation. In order to obtain high data throughput rates, the synchronization of a transmission clock with the reception clocks is used. This synchronization is gotten, for example, by transmission of a pseudo-random code and by the convolution or correlation of the received signals with the pseudo-random code. The invention also enables the elimination of multiple echoes by computation. The invention can be applied chiefly to the transmission of radio programs, television broadcasts or digital data.

Abstract: An integrated circuit for convolution type computations of the form ##EQU1## where j-i+k, and j and k are integers and i is a natural integer, C.sub.i being complex coefficients and X.sub.j being complex or real input data, for use in digital signal processing. A plurality of cells are connected in a sequence, all receiving simultaneously the input data; the complex coefficients are subsequently sent on a propagation bus to a cell first in the sequence of connected cells. Each cell includes a multiplier, and an adder accumulator, and a transfer circuit for transferring received coefficients to the next cell. In each cell, sequentially received coefficients are first used for computation and then transferred by the transfer circuit with a suitable delay. A logic device controls the time distribution and repetition of the real and imaginary parts of the input data.

Abstract: A device for computing a nonrecursive and sliding discrete Fourier transform as applicable in particular to processing of a pulse compression radar signal has N identical and parallel stages (E.sub.k) for receiving in each case samples of the input signal (e.sub.m+N). Each stage comprises two complex rotation operators, two adder-subtracters and two delay circuits and delivers a signal X.sub.k.sup.

Abstract: The present invention concerns mainly a filter, a phase-measuring device and a method to apply said filter. The main object of the invention is a phase-measuring device. The use of adapted filters (140) enables the increasing of the signal/noise ratio of a received signal. However, if several samples of the signal are sent, each having a different phase, the signal present at the output of the adapted filter at any given instant risks being a mixture of the phase of two successive samples. The use of an odd value filter (141) makes it possible to determine the only instants during which the phase measurement corresponds to the phase of a single sample of the signal. The invention can be applied chiefly to the demodulation, detection or decoding of television and radio broadcasts or phase-modulated data transmissions.

Abstract: A device for calculating a discrete, moving window and non-recurrent Fourier transform, especially applicable to the processing of a pulse compression radar signal. The device includes N stages which, on the basis of samples of the input signal, each give a signal of the form: ##EQU1## where k is the index of the stage (O<k<N), m the index of the window and N the number of samples in the window, N being a multiple of four. The complex rotations of the expressions (1) and (3) are each broken down into a rotation in the first quadrant of the complex plane, a rotation common to N stages and a supplementary rotation specific to each stage, achieved by addition-subtraction.

Abstract: A device for calculating a discrete moving window Fourier transform. It comprises an assembly of circuits receiving samples of the input signal (E.sub.m+n), the output signal of this assembly (.delta..sub.m) being applied to a plurality of N identical and parallel stages (E.sub.k). The assembly of circuits comprises a shift register conferring a delay of N sampling periods on the incident signal and an adder performing the subtraction:.delta..sub.m =x.sub.m+N -X.sub.mof the input and output signals of the shift register. Each of the N stages delivers a signal in the form:x.sub.k.sup.m+1 =X.sub.k.sup.m +.sub.m .delta..e.sup.j2.pi.k/N.