Abstract: The invention relates to a multi port router device capable of carrying a number P, which is greater than or equal to three, of frequency channels, from a number M of input ports to a number N of output ports, at least one of the two numbers M and N being greater than or equal to two, characterized in that it includes at least two filters (12, 14, 16, 18), each filter comprising at least two coupled resonators, at least one resonator (Rs1, Rs2) being common to two different filters, and each input port and each output port being connected directly to at least one resonator.

Abstract: The present invention relates to an in-service reconfigurable antenna reflector comprising a rigid support and a membrane, deformable and having radio-electric reflectivity properties. According to the invention, the reflector comprises a plurality of coupling means connecting the rigid support and the membrane, comprising a first link of finger ball joint type connected to the rigid support, and a second link of finger ball joint type connected to the membrane. Each coupling means furthermore comprises a linear actuator, comprising a rotary motor and a screw-nut assembly, connected to the two links of finger ball joint type, and able to generate, in an operational configuration, a translational motion allowing the deformation of the membrane.

Abstract: A process of encoding information data in a sequence of bursts ( . . . , Bi?2, Bi?1, Bi, Bi+1, . . . ), each burst comprising a block of information symbols and a block of redundancy symbols. The block of redundancy symbols (Ri) of the current burst (Bi) of the sequence is generated by calculating a sum of a series of coding values relating to a series of bursts (Bi?2, Bi?1), each coding value of the series of coding values being obtained by a respective coding function applied to the block of information symbols of the corresponding burst of the series of bursts.

Abstract: A global navigation satellite system (“GNSS”) positioning method is provided, based upon a GNSS radio signal that includes a navigation message transmitted as a sequence of frames, each frame being composed of a plurality of subframes, each of which contains a first set of ephemeris and clock correction data (DECH) sufficient for computing a satellite position and a satellite clock error. Each subframe furthermore contains a second set of DECH, more compact than the first set of DECH, but sufficient for computing satellite position and satellite clock error to a lesser degree of accuracy, at least two copies of the second set of DECH being present in each subframe, such that the timing difference between two consecutive copies does not exceed 70% of the subframe duration.

Abstract: A method is provided for demodulating a signal carrying a message transmitted by a terrestrial beacon, executed by a system comprising a constellation of satellites suitable for detecting said signal and for repeating it towards receiving stations on the ground, and an analysis module suitable for receiving signals from said stations. Each receiving station transmits the signals that it receives from the satellite to the analysis module, said module realigning said signals in frequency and/or in time relative to one another, combining the realigned signals to generate a synthetic signal having an enhanced signal-to-noise ratio, and determining the content of said message and/or the modulation parameters of said synthetic signal. The method applies notably to the accurate and reliable location of distress beacons by a satellite system.

Abstract: The method for detecting AIS messages involves providing digital data representing signals received by a satellite on at least one AIS channel, and identifying a candidate message in the digital data by correlating the digital data with a hypothetical fragmentary message, the hypothetical fragmentary message includes at least one AIS message fragment which is dependent on transmission time and/or transmitter position and which is determined with the assistance of a database of AIS transmitters.

Abstract: A propulsion system of a spacecraft comprises a main tank adapted to contain a volume of propellant and a pressurizing gas which applies pressure to the propellant. The main tank comprises a membrane delimiting an upper volume to contain the pressurizing gas and an inferior volume to contain the propellant, the gas applying the pressure to the propellant by means of the membrane. A pressurization circuit is connected directly to the main tank. The propulsion system further comprises an auxiliary tank adapted to contain pressurizing gas. The auxiliary tank is connected directly to the main tank by means of the pressurization circuit. When in operation, gas contained in the auxiliary tank expands continuously with the gas contained in the upper volume of the main tank, the pressures prevailing in the upper volume of the main tank, in the pressurization circuit and in the auxiliary tank being identical.

Abstract: The invention relates according to a first aspect to an interferometric inversion method for measuring a characteristic variable of a radiation source and/or of a medium through which the radiation passes between the source and an interferometer, the interferometer being capable of generating an interferogram of the radiation by creating a finite number of optical step differences between two rays that have followed the same path between the source and the interferometer, characterized by the implementation of the steps whereby a quantity characterizing an improvement in the inversion is determined, step differences that contribute mainly to optimizing the quantity characterizing an improvement in the inversion are selected without sampling regularity constraints, and a free interferogram is generated using only the selected step differences. According to a second aspect, the invention provides an interferometer for implementing the method according to the first aspect of the invention.

Abstract: A method includes estimating a position of a receiver, aboard a moving object, on the basis of the navigation signals emitted by satellites received by an antenna in an antenna array placed on the moving object, and using a three-dimensional geographical map to deduce, geometrically, on the basis of the position of the receiver and of a ray casting starting from the receiver, the number of paths reflected on walls of buildings present in a scene corresponding to an environment surrounding the receiver. The determined number of reflected paths is used to initialize an algorithm for estimating angles of arrival of multi-paths to deduce therefrom angles of arrival of the paths reflected on the walls before reaching the receiver. Optionally, the method can comprise making it possible to bound the distance information error due to a multi-path to render the estimation of direction of arrival of the signals more efficacious.

Abstract: A hyperfrequency interconnection device between two components is provided, each component comprising an upper face and a signal line arranged on the upper face, the planes containing the upper faces of the components being separated by a distance known as the height difference. The hyperfrequency interconnection device comprises a substrate comprising a lower face and an upper face defined by a first axis and a second axis perpendicular to the first axis, a signal line arranged on the lower face of the substrate, a projection of the signal line into the plane of the upper face forming the first axis, at least two contact pads capable of electrically connecting the signal line of the device to the signal line of the components. The upper face of the substrate is corrugated along the second axis, capable of conferring on the substrate flexibility along the first axis.

Abstract: A method of manufacturing a radiation-resistant optical fiber and a thus-obtained radiation-resistant optical fiber, the method includes the following steps: a) manufacturing a silica optical fiber preform; b) forming, in the preform, a longitudinal cavity; c) drawing the preform so as to form an optical fiber (1) including a core (2), an optical cladding (6) and at least one longitudinal cavity (3) having at least one opening (13) at one end of the optical fiber (1); d) applying, during step c) of fiber drawing, a gas-tight coating (4); e) exposing the optical fiber (1) to a gaseous substance, including preferably gaseous hydrogen and/or gaseous deuterium, in such a way to incorporate the gaseous substance in silica via the opening (13); and f) closing any opening (13) at both ends of the optical fiber.

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: The invention relates mainly to a test bench (10) for a radial bearing (14) suitable for being interposed between two members (12, 16) that are movable relative to each other in rotation, the test bench being characterized in that it comprises a radial force measurement device (18) for measuring radial forces exerted on said bearing (14), a radial acceleration measurement device (20) for measuring radial accelerations to which said bearing (14) is subjected, and an electronic calculation unit (26) in communication with the radial force measurement device (18) and with the radial acceleration measurement device (20). The invention also relates to a method of establishing a behavior relationship for the radial bearing (14).

Abstract: The Hall effect plasma thruster includes a main annular channel for ionization and acceleration that presents an open downstream end, at least one cathode, an annular anode concentric with the main annular channel, a pipe and a manifold for feeding the channel with ionizable gas, and a magnetic circuit for creating a magnetic field in the main annular channel. The main annular channel includes inner and outer annular wall portions delimiting the open end, each of which includes an assembly of juxtaposed conductive or semi-conductive rings in the form of laminations separated by fine layers of insulation.

Abstract: Disclosed is an optical time-stamping device, including an optical instrument with a retina having a field of view and being able to produce on the retina images of the field of view, and a high accuracy reference clock signal receive. The time-stamping device also includes: a lighting source at a distance from the retina of an optical instrument, and configured to emit a light signal in the direction of the retina of an optical instrument and in the field of view of an optical instrument, and a control unit connected to the reference clock signal receiver by a first connection and to the lighting source by a second connection, and configured for controlling the lighting source for emitting a light signal in a synchronized way with the reference clock signal. An associated image sensing system and optical time-stamping method are also disclosed.

Abstract: The converter comprises an inverter and a conversion unit in which a transformer powers a controlled rectifier formed by saturable inductors and power diodes. According to the invention, a series reactive circuit associated with the transformer co-operates with the controlled rectifier for the phase displacement of the voltage applied at the primary of the transformer in relation to the current flowing therethrough. The phase displacement is regulated by a control voltage as a function of the variations in the output voltage of the converter.

Abstract: The invention relates to a device for correcting at least one optical aberration, of known evolution of an optical system, the device comprising: a deformable mirror (1) having a contour; means (2) for deforming the mirror; characterized in that the mirror (1) has a geometry selected such that the contour of the mirror (1) is defined from a composite function of said at least one aberration and in that the means (2) for deforming the mirror are adapted to apply a flexing moment on the edges of the mirror, the deformable mirror being concave or convex when it is deformed.

Abstract: A cooling method for cooling a device connected to a cryogenic tank via a main admission duct for feeding the device with cryogenic fluid once the device is cooled. In contrast, during cooling, a cryogenic fluid is introduced into the device via a cooling admission duct that is different from the main admission duct and that presents a flow section that is narrower than the flow section of the main admission duct.

Abstract: A method for the acquisition of a radionavigation signal carrying a spreading code with a quasi-infinite period, where the signal is sampled in baseband on a delay line and correlated with a local spreading code replica, the sampled signal is shifted on the delay line from one correlation to the other, where in order to correlate the signal with the local replica of the code, a plurality of sequences of the spreading code are generated, the code sequences being of the same duration, equal to the duration of the signal sampled on the delay line, and associated with the consecutive time ranges in the temporal alignment search space, where each of the code sequences is correlated with the signal sampled in a respective correlation operation, the correlation operations being executed in parallel for the different sequences of code.