Abstract: A device is suitable for revealing spatial variations in polarization of an electromagnetic radiation, in a form of localized temperature variations. The device includes a surface of a carrier which is electrically and thermally insulating, and includes an array of patterns which each consist of at least one rectilinear segment of a sensitive material, of which the orientation is variable within each pattern or between neighboring patterns. Such device may be used with a thermal camera to reveal, in infrared images, temperature variations which are localized at segments not perpendicular to a local direction of linear polarization of the radiation.

Abstract: Disclosed is a method for producing a stage for amplifying the power of a variable envelope signal including at least one amplifier. For each amplifier, a form of ideal variation in average power POUTL is selected. For each value of each setting parameter and for each average input power value, a value of an optimisation criterion is calculated on the basis of the mathematical expectation of at least one optimisation parameter. An optimum value of each setting parameter is determined and the amplification stage is produced with a number of amplifiers in parallel determined on the basis of an average output power value and with, for each amplifier, matching circuits providing the optimum values of the setting parameters. The invention also relates to an amplification stage produced in this manner.

Abstract: A process and a device for measuring intermodulation products by wave reflection on a non-linear object (20), including two electromagnetic sources (24, 25) of distinct focal points emitting fundamental components, and a receiver (28), the process includes a step in which the measuring device is in a configuration so that the receiver (28) produces a signal for a first composition of the enriched wave (23), and a second step in which the measuring device is in a second configuration so that the receiver (28) produces a measuring signal for a second composition of the enriched wave (23).

Abstract: The invention relates to a method of receiving digital data transmitted on a coded serial digital transmission modulated on a noisy channel with non-stationary equalization attenuation. Digital data are stored associating a value of quality of transmission with the information elements received, and a mutual information value Ik is computed for each value of the quality of transmission. The value of quality of transmission consists of an equivalent signal/noise plus interference ratio calculated as a function of the method of equalization on the basis of various signal/channel noise ratio values measured for the various temporal symbols of information elements received of the signal received corresponding to one and the same information element and according to interference due to the waveform.

Abstract: The invention relates to a method for correcting a message the generation of which involves transforming an initial message and inserting bit stuffing into the transformed message, which method comprises providing an observation sequence containing the message to be corrected. A number of path hypotheses are generated via a trellis diagram associated with the transformation. The nodes of the trellis diagram each represent a state of a finite-state machine capable of transforming the initial message and the branches represent the possible transitions between nodes. Among the branches of the trellis diagram, certain represent conditional transitions that may be made only when bit stuffing is present. During the generation of a path hypothesis, bit stuffing is detected and the branches taken are those associated with the detected bit stuffing. The most likely path hypothesis relative to the observation sequence is finally retained.

Abstract: The invention relates to a method of receiving digital data transmitted on a coded serial digital transmission modulated on a noisy channel with non-stationary equalisation attenuation. Digital data are stored (33) associating a value of quality of transmission with the information elements received, and a mutual information value Ik is computed (34) for each value of said quality of transmission. Said value of quality of transmission consists of an equivalent signal/noise plus interference ratio calculated as a function of said method of equalisation on the basis of various signal/channel noise ratio values measured for the various temporal symbols of information elements received of the signal received corresponding to one and the same information element and according to interference due to said waveform.

Abstract: The method according to the invention relates to the decoding of a sequence of symbols, the sequence of symbols having been generated by: calculating a CRC value for an initial message; combining the initial message and the CRC value so as to produce a transformed message; and, encoding the transformed message. The decoding comprises: generating a number of path hypotheses via a trellis diagram corresponding to the trellis diagram of a finite-state machine comprising the encoder and the CRC generator, in which the encoder and the CRC generator are supplied with the same input. According to a preferred embodiment of the method, the trellis diagram is adapted to take into account bit stuffing possibly inserted in the transformed message before encoding.

Abstract: A method and a device for predictive evaluation of intermodulation power in an electronic device in which a predictive function f makes it possible to evaluate in a predictive manner values of power of an intermodulation component produced by an intermodulation distortion of an input signal, characterized in that the predictive function f includes an odd part V obtained by multiplication of an odd function F and of a function G, obtained by composition of a positive real-valued even function g and of a function Q in the form of a real series including at least one term of degree q belonging to the non-integer reals.

Abstract: A device (1) for draining a tank of fluid under pressure pertaining to a space system includes a pyrotechnic actuator that is suitable to perforate a conduit (2) in fluid communication with the tank, the device including a collar (4) that is suitable to enclose the conduit, the collar bearing: a pyrotechnic cartridge (5) for perforation, oriented radially towards the conduit (2), and an anvil (11), diametrically opposed to the cartridge in relation to the conduit, that is suitable to collect debris generated by the perforation.

Abstract: A method for characterizing an optical focusing defect of an image capture instrument is based on contrast values. Said contrast values are calculated for two images of a same scene portion, captured in respective overlapping length segments of two image sensors. To this end, the sensors are mounted in an image capture instrument so that the overlapping length segments between the sensors are situated at different heights along a focusing direction perpendicular to said sensors.

Abstract: A method and a device for deflating an inflated wall (1), wherein the inflated wall (1) is cut by using at least one cutting member adapted to cut the inflated wall (1) along a cutting line with the effect of causing a deflation opening of the inflated wall (1). The invention applies in particular to the inflated envelope of an aerostat balloon.

Abstract: An instrument for of observation images exhibits a high ground resolution and a high frequency of coverage of the Earth. Such an instrument includes a spatial images acquisition layer (1) including satellites (4), a terrestrial images processing layer (3), including images processing devices (5), and a telecommunications layer (2) that is suitable to ensure a transfer of the images from the spatial layer (1) to the terrestrial layer (3), wherein each satellite (4) includes at least one images acquisition device with fixed aim exhibiting a spatial resolution of the order of one meter; each images processing device (5) includes at least one communications line (8) coupling the images processing device (5) and at least one immediately adjacent images processing device, a processing unit that is suitable to process the images received, element for storage of the processed images, and a connection to a digital network.

Abstract: A wind-powered device for producing electrical energy includes an electric generator set (1) which works by converting mechanical energy into the electrical energy, a wind-powered set (3) designed to capture the energy of the wind and convert it into mechanical energy, a transmission (2) positioned between the wind-powered set (3) and the generator set (1), the transmission (2) being designed to transmit mechanical energy produced by the wind-powered set (3) to the generator set (1), characterized in that the wind-powered set (3) includes at least two air turbines known as wind turbines (4) including non-coaxial shafts (5) coupled to the transmission (3), the wind turbines (4) being designed in such a way as to present an equivalent surface area to the wind that exceeds the surface area exposed to the wind of each of the wind turbines (4).

Abstract: A device for extracting a clock signal from a baseband serial signal, includes an injection-locked oscillator (19), a phase-locked loop (25) including a digital phase detector (26). The oscillator (19) includes a digital input for controlling the value of its natural frequency, and the phase-locked loop (25) includes a counting circuit (30, 35) aggregating the relative values of the digital signal supplied by the digital phase detector (26) and supplying a control signal in digital form for the oscillator (19).

Abstract: A wind-powered device for producing electrical energy includes an electric generator set (1) which works by converting mechanical energy into the electrical energy, a wind-powered set (3) designed to capture the energy of the wind and convert it into mechanical energy, a transmission (2) positioned between the wind-powered set (3) and the generator set (1), the transmission (2) being designed to transmit mechanical energy produced by the wind-powered set (3) to the generator set (1), characterized in that the wind-powered set (3) includes at least two air turbines known as wind turbines (4) including non-coaxial shafts (5) coupled to the transmission (3), the wind turbines (4) being designed in such a way as to present an equivalent surface area to the wind that exceeds the surface area exposed to the wind of each of the wind turbines (4).

Abstract: A reciprocating actuator includes at least one element moving reciprocally relative to a rack, a device for driving the moving element in a driving direction, an element for returning the moving element in an opposite direction, at least one sensor for detecting the position of the moving element, and a servocontrol adapted to deliver, for each displacement cycle of the moving element in the driving direction, at least one correction signal (S5) representative of the difference between the energy imparted on the moving element during at least one preceding cycle, and the nominal energy to be imparted on this moving element to displace it exactly to its extreme set-point position, and to adjust on each cycle the control signal of the driving device according to the correction signal (S5).

Abstract: A method and a device for deflating an inflated wall (1), wherein the inflated wall (1) is cut by using at least one cutting member adapted to cut the inflated wall (1) along a cutting line with the effect of causing a deflation opening of the inflated wall (1). The invention applies in particular to the inflated envelope of an aerostat balloon.

Abstract: In a method and a machine for testing an electronic device, in which the magnetic field emitted is measured by a monodirectional measurement probe, a first value of the component Bz of the magnetic field along axis ZZ? is measured by the probe and recorded. The probe and the electronic device are displaced with respect to one another by relative pivoting about an axis XX? orthogonal to axis ZZ?, according to an angular amplitude of less than 90° while maintaining distance d0 and, for each position (x, y) of axis ZZ?, a second value of component Bz of the magnetic field along axis ZZ? is measured by the probe and recorded, then the value of component By of the magnetic field along axis YY? orthogonal to axes ZZ? and XX? is determined and recorded on the basis of the first value and the second value which have been obtained.

Abstract: The invention relates to an electromagnetic actuator with variable reluctance comprising a fixed ferromagnetic armature (3) comprising at least two concentric cylinders of revolution linked by a ring nut, at least one magnetizing winding (2) arranged between said cylinders, a ferromagnetic moving armature (4) guided in reciprocating translation movements relative to said fixed armature (3), with which it defines a magnetic circuit with an air gap (20), the dimension of which varies during reciprocating translation movements of the moving armature (4), wherein said fixed armature (3) comprises at least two series of slots, a first series of slots provided radially in said outer cylinder and extending over the entire height of said outer cylinder, and a second series of slots provided radially in said outer and inner cylinders and extending only over a major part of the height of said cylinders.

Abstract: A device for power amplification of a payload of a multibeam satellite for broadcasting data, in which the circuits (10) for amplifying the data signals to be broadcast are connected to the broadcasting antennas (40, 41, 42, 43) by switches (12) and addition circuits (20, 25, 26, 27) making it possible to select a predetermined broadcasting configuration of the data signals. A satellite equipped with such an amplification device is also described.