Abstract: Disclosed is a detection method and a corresponding array architecture comprising sensors positioned according to a particular geometry, enabling the integration of a circuit for the management of the integration cycles and of transfers of charges between injection-integration circuits and TDI type summation circuits in the focal plane of the array. The array is fitted into a scanning camera that scans in a particular direction. The camera is designed to form a video signal for an image made up of pixels spaced out at a pitch p.sub.p with a value corresponding to the standard. The array has several rows of elementary sensors. The the sensors that belong to different rows and are aligned in the scanning direction define a detection channel V.sub.k. The spatial pitch p.sub.c of one and the same detection channel has a value that differs from the value of the pixel pitch p.sub.p by a fraction of this pixel pitch such that a sensor-pixel coincidence, which is achieved for a reference sensor C.sub.

Abstract: A system for the reading of a multitrack recording medium comprising a device enabling the reading, on the width of each track, of a number n of information samples. The system includes a filter enabling the making of several combinations of several samples of a track, these combinations differing from one another by a shift equal to one or more samples; a sub-sampling circuit that chooses a determined combination from among the different combinations of a track under the control of a position predictor; a positional error computation circuit computing the positional error of the chosen combination and giving an error correction signal to the position predictor.

Abstract: A radiocommunications and localization device of the type comprising an array of antennas coupled respectively to a goniometer device and a radio receiver delivering phonic signals to an operator respectively on two headphones. This device includes a device to identify the position of the operator's head and a device for the generation of phonic signals that is coupled to the goniometer device, the radio receiver and the identifying device for the application, respectively to the headphones, of the mutually phase-shifted phonic signals so as to give the operator the impression that the phonic signal that he hears is coming from the direction of arrival of the radiowaves determined by the goniometer device. The applications of this device relate to the radio-localization of persons moving in groups.

Abstract: The method consists in estimating the matrix of correlation R.sub.XX of the signals received on a set of N reception sensors, computing the reverse correlation matrix R.sub.XX.sup.-n, computing vectors of intercorrelation r.sub.Xd between the signals received on the set of the N sensors and a known replica signal d(k), computing a criterion of synchronization in calculating the products of the conjugate, transposed intercorrection vectors R.sub.XX.sup.-n and of the matrix of the intercorrelation vector r.sub.Xdi and comparing the value of the criterion obtained with a determined threshold value 1 to place the synchronization on the sample for which the value of the criteria exceeds the threshold value .eta.. To estimate the Doppler shift the synchronization sequence is subdivided into a determined number of sections of symbols to carry out fast Fourier transform computations on determined intercorrelation vectors in each section.

Abstract: The invention relates to a color display device comprising a chromatic dispersive grating and an active matrix possibly of liquid crystal type. This device moreover comprises a matrix of spherical microlenses, the shape of the cross section of the microlenses being such that it makes it possible to compensate for the spreading of the R G B colored beams by virtue of the use of a dispersive grating, and hence to make best use of the circular aperture of projection objectives.

Abstract: The invention relates to air-launched buoys intended to be launched from a flying aircraft. It consists, in a buoy the body of which is small and has neither flaps nor inflation opening, in making the connection between the balloon which makes the buoy buoyant and the body leaktight and in placing on the lower part of this balloon a beak of triangular shape allowing air to be caught as the buoy falls towards the water. An opening is made in the wall of the balloon below the beak to allow the air thus caught to enter this balloon in order to inflate it. A non-return valve makes it possible to keep the balloon inflated. It makes it possible to improve the inflation of the balloon and limit the speed at which the buoy falls.

Abstract: System for recording/writing on a recording medium in which there are distributed, on the tracks, groups (G0) of tracks with positive continuous components and groups (G1) of tracks with negative continuous components. In reading, the values of the different signals are integrated for each track. Then, on the one hand, a first addition circuit S1 adds up the results of integration of the first tracks of each group of tracks and, secondly, a second addition circuit S2 adds up the results of integration of the last tracks of each group of tracks. A comparison circuit (CD) compares the results of additions of the two addition circuits to correct the track-following operation.

Abstract: The disclosure relates to a synchronous permanent-magnet electric motor and a vehicle driven by such a motor. The electric motor has a leakage inductance whose value is at least about 10% of the value of its effective inductance. In this way, the total inductance of the motor is maximized so as to optimize the effect of the variation of the phase of the stator current on the variation of the voltage at the terminals of the motor. The invention is notably applicable to an electric vehicle.

Abstract: A fast differential sample-and-hold circuit includes two transistors controlled so as to be turned on or off. The output signal of the circuit is recovered at the terminals of an output capacitor connecting the emitters of the two transistors. The sample-and-hold circuit includes additional circuitry having two dynamic current generators and an additional capacitor which make the current flowing through the transistors constant when they are on. To this end, the two dynamic current generators are modulated by differential current which is output by the additional capacitor and the variations in which reproduce the current variations which appear in the output capacitor.

Abstract: A method for the manufacture of a luminophore comprising the following steps:a) the weighing of the different constituent materials in powder form;b) mixing in an aqueous medium;c) the evaporation of the liquid;d) the screening of the powder at 100 .mu.m;e) baking at a temperature of 1100.degree. C. to 1400.degree. C. in a neutral gas atmosphere with injection of neutral gas into the interior of the powder;f) the screening of the baked powder;g) crushing to reduce the size of the grains and then screening;h) the annealing of the crushed powder at a temperature of 700.degree. C. to 1200.degree. C. so as to obtain a reorganization of the first atomic layers of the grains of the powder;i) the mixing of the annealed powder in an aqueous medium, and sedimentation and then removal of the upper part of the liquid containing the powder in suspension;j) the drying of the removed suspension and the screening of the powder obtained.

Abstract: The invention relates to underwater acoustic transmitters intended to be submerged at large depths. It consists in threading the set of annuli forming the transmitter onto an internal tube (303) preferably made from a carbon/resin composite, which supports two end plugs (306, 307) making it possible to relieve the set of annuli of the radial component of the hydrostatic pressure. Furthermore, between the piezoelectric annuli (101) of the transmitter are inserted decoupling annuli (301) which are made as a three-layer structure including a hard and rigid internal layer (201) and two flexible and elastic external layers (202, 203). It makes it possible to increase the transmitting power of these acoustic transmitters.

Abstract: A method for the making of a magnetic recording/reading head comprises the following steps:the making of magnetic excitation wires on or in a first face of a substrate having this first face and a second face opposite the first face;the making, on the first or second face of the substrate, of at least two magnetic poles separated by a gap;the drilling of holes through the substrate from the face opposite the one bearing the magnetic poles, each ending in such a way that there is magnetic coupling between the bottom of the hole and the pole;the deposition of a layer of material with high magnetic permeability in the holes and in the zones of the substrate located between the holes. Applications: the making of magnetic recording/reading heads for video-tape recorders, computer peripherals and professional recording machines.

Abstract: The invention relates to an illumination device for illuminating a display device. In a preferred embodiment, non-polarized light from a non-polarized light source is polarized by a holographic polarization beam splitting device and focused onto a liquid crystal display device by a holographic focusing device. The invention is operable with monochrome and color display devices, and allows for a high light yield independent of the useful surface area of each detector element of the display device.

Abstract: A process relating to the manufacture of medical echograph probes for establishing a network of connections to elementary transducer units. The process includes the steps of cutting transducer units from a piezoelectric plate, drilling holes in a polymer film on the piezoelectric plate by means of a photoablation process or a reactive ion plasma etching process, and making connections by metallization and then etching to form conducting tracks which connect to the piezoelectric layer via the drilled holes.

Abstract: The disclosed broadening method consists in dividing the radar antenna into n groups of columns of active modules, applying, at transmission, a different linear phase law to each group and, at reception, forming n.sup.2 simultaneous beams, each having the nominal angular width of the complete antenna, and in shifting these beams as a whole to cover the angular domain in which the energy has been radiated at emission.

Abstract: Magnetic write/read heads for writing/reading information on a recording medium passing in front of the heads include several groups of magnetic write/read heads, each group of magnetic write/read heads including several pairs of poles. Each pair of poles is separated by a head gap of an integer multiple of an elementary track width b and forms several head gaps E0 to E7. The head gaps (for example El) have a first width such that they can write across a first width of the recording medium, and the second head gaps (for example E2) have a second width less than the first width and are arranged in such a way that the second head gaps write/read an area of the recording medium superimposed on the area of the recording medium write/read by the first head gaps. The magnetic write/read heads are suitable for applications where multitrack write/read heads are required.

Abstract: The disclosure relates to electronic scanning array antennas whose radiating elements are distributed within a volume instead of being distributed on a reflective surface that is plane or generated by revolution. It pertains to a method for broadening the beam of a volume antenna aimed in a direction without giving it asymmetrical deformation or substantially increasing the secondary lobes. This method consists of applying the following phase excitation law to the radiating elements of the volume antenna: ##EQU1## where .lambda. is the wavelength of the radiation transmitted or received and .rho..sub.n is the distance from the radiating element with an index n considered to a point I external to the volume antenna located on the axis of aiming direction on the side opposite the aiming direction.

Abstract: The process consists in carrying out, via a phase-locked loop controlling a clock frequency, a slaving of a comparison signal to the falling edge of the line synchronization pulse, in decoding at the output of a dot counter integrated into the loop and controlled by the clock, on the one hand a value N triggering the comparison signal and corresponding to a specified position inside the line synchronization pulse relative to its falling edge, on the other hand values triggering the rezeroing of the counter and time signals synchronous with the clock and clocking the digital processing of the video signals sampled at the clock frequency.

Abstract: This target detection polarimetrical processing circuit comprises, in parallel, a polarimetrical CFAR detector provided with a target detection output, a polarimetrical clutter-rejection filter associated with a CFAR detector provided with a target detection output and a bank of polarimetrical filters associated with CFAR detectors provided with target detection outputs, and an "OR" type logic circuit combining the different target detection outputs and a selection circuit activating the polarimetrical clutter-rejection filter and disabling the bank of polarimetrical filters when the degree of polarization of the clutter exceeds a certain threshold and conversely disabling the polarimetrical clutter-rejection filter and activating the bank of polarimetrical filters when the degree of polarization of the clutter is below said threshold.

Abstract: The method enables the control of congestion in sporadic exchanges of packets of data in a digital transmission network. Each packet is formed by a header enabling it to be identified and to be guided through virtual channels and by a part containing information elements to be conveyed. The method includes detecting, at each node of the network, channels that are congested, and, on nodes upline with respect to each congested virtual channel detected, transmitting a congestion indicator to stop connections on the congested virtual channels so long as the congestion observed by a node on the congested virtual channels has not been cleared.