Abstract: A satellite cellular radio-communication system using beam formation is provided. The system includes a satellite, at least one satellite access station, terminals, at least one control unit of a virtual cell. At least one of the terminals is configured to transmit and receive on a transmission channel having at least two frequency and spatial transmission resources of a same virtual cell that are different by their frequency band, a frequency and spatial transmission resource being a sub-band of a frequency band used in a beam. The frequency band is taken from among a predetermined number of frequency bands and was allocated to said beam according to a reuse function.

Abstract: The subject of the invention is a satellite comprising at least one central router, a source terminal and a destination terminal. The source terminal comprises means for transmitting, via the central router, IP packets fragmented into at least one level-2 fragment to the destination terminal to which a destination IP address is allocated. The said central router is composed of a satellite and of a ground router. The satellite comprises means for implementing a switching of the IP packets without reassembling the level-2 fragments sent by the source terminal to the destination terminal, the said fragments comprising a reference to the Destination IP address used as basis for the switching. The ground router comprises means for determining IP routing parameters, the said parameters being transmitted by the ground router to the satellite so as to configure the way in which the switching is carried out by the said satellite.

Abstract: A method is provided to calibrate a detection array used for acquiring an image of an interferogram at an instrument. A first interferogram and at least two shifted interferograms are elaborated at the instrument by creating a number of optical path differences, so at least three samples are on a sine wave portion for each optical path difference. A function coinciding with the sine wave portion is determined by interpolation. A calibration coefficient is determined from the function for each optical path difference.

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: The invention is situated in the field of telecommunication satellites. A deployable structure with which such a satellite may be equipped and a method of deploying the deployable structure is provided. The deployable structure includes: a set of primary panels, a set of secondary panels, primary articulation systems, each primary articulation system enabling a primary panel to be caused to pivot relative to another primary panel about a primary axis, the primary axes being substantially parallel to the primary panels, and secondary articulation systems, each secondary articulation system being associated with a secondary panel and enabling said panel to be caused to pivot relative to another panel about a secondary axis parallel to said panels, the deployable structure being configured in such a manner that, in a deployed configuration, the front surfaces of the panels form a substantially continuous overall surface.

Abstract: The converter comprises an inverter powered by a DC current source. The inverter powers a conversion unit operating on the basis of controlled magnetic switching obtained by means of power diodes and saturable inductors. A regulator can be used to produce a control voltage that is a function of the output voltage which is regulated with the injection of the control voltage into the circuit comprising the smoothing inductors. According to the invention, during each operating cycle, one of the power diodes is locked when the other power diode switches to conduction mode, such as to create a phase displacement between the input voltage of the conversion unit and the input current of same. The phase displacement angle is a function of the control voltage.

Abstract: The invention relates to a method for analyzing an integrated circuit, including a step for applying laser radiation at a point on the surface of the circuit, a step for exciting the circuit thus subjected to laser radiation by applying an electrical excitation signal, a step for collecting the response of the circuit to the excitation, the circuit being subjected to laser radiation, and a step for measuring the phase difference between the response to the excitation of the circuit subjected to laser radiation and a reference response of the circuit in the absence of laser radiation applied to the circuit. The invention also relates to an associated observation method and installation.

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: The invention relates to a device for preventing the establishment of an electric arc between two adjacent parts, which have no electrical insulation, of at least two electrically conductive elements, comprising at least one piece made of a dielectric material, said device having at least one through-opening for receiving at least one of said at least two electrically conductive elements so as to surround at least one of said at least two adjacent parts, which have no electrical insulation, of said at least two electrically conductive elements.

Abstract: A method for identifying transmitters by a terminal in a single-frequency network comprising a plurality of transmitters. The transmitters are synchronized and transmit with an artificial delay ?i, specific to each transmitter. The method comprises at least one step of acquiring the approximate position of the terminal {circumflex over (p)}, the position pi of a list of transmitters {Tx} in the vicinity of the terminal and the delays ?i associated with them, a step of measuring pseudo-distances ?i between the transmitters and the terminal and a step of associating the measurements ?i with the transmitters of known positions pi by minimizing a cost function, said cost function ?(?i,{circumflex over (p)},?) corresponding to the norm of the error between the measurements ?i and a model of measurements of the pseudo-distances applied to a permutation of the position of the transmitters ?.

Abstract: The invention relates to an antenna comprising a plurality of metallic elements (10, 20, 30, 40), said metallic elements (10, 20, 30, 40) being in point contact (11, 21, 31, 41) with a ground plane (M) and equally distributed about a central axis of symmetry (D) of the antenna, perpendicular to the ground plane (M). The antenna of the invention is characterized in that each metallic element extends from the point contact at a non-zero angle of inclination (q) to said ground plane (M) and in that the ground plane (M) includes at least one cavity (80-83, 84-87) so that, in operation, the antenna matching is better in a specified frequency band than when the ground plane (M) has no cavities.

Abstract: The invention relates to an antenna of the helix type, comprising a plurality of radiating strands wound in a helix in an axisymmetric form (15), characterized in that each radiating strand is made up of at least one reference pattern (MR1, MR2, MR3) defined by an analytic function defined in a reference frame, the axis of the abscissae of which is the director axis of the radiating strands and is a periodic function of (I) or (II) and Ak correspond respectively to the frequency and to the amplitude of the sinusoid of index k.

Abstract: A propulsion system of a spacecraft includes a main tank adapted to contain a volume of propellant and a pressurising gas which applies pressure to the propellant. The main tank includes a membrane delimiting an upper volume to contain the pressurising gas and an inferior volume to contain the propellant. The system further includes an auxiliary tank adapted to contain pressurising gas and connected directly to the main tank by a pressurisation circuit. 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 pressurisation circuit and in the auxiliary tank being identical. The auxiliary tank is dimensioned so that the maximal volume of propellant of the main tank is greater than the volume of propellant which the main tank can contain without an auxiliary tank.

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 spread-spectrum signal comprises a spreading waveform modulating a carrier wave and containing a real linear combination of a first waveform at a first waveform rate and a second waveform at a second waveform rate, the first waveform rate being distinct from the second waveform rate and both waveform rates being distinct and non-zero. The linear combination of the first and the second waveform is modulated with at least one binary sequence comprising a signal identification code.

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 receiving method for a digital stream, the stream including frames having each a body composed of a variable number c of symbols and preceded by a header including d symbols, a field composed of a fixed number e of symbols unknown to the receiver and defining the number c. A locking phase of the receiving method includes receiving a series of e symbols of the stream; performing a correlation computation for pairs of symbols received, the correlation computation being used to verify a predefined relationship if the e symbols form the unknown field; determining a correlation level and determining whether the e symbols form the unknown field on the basis of the correlation level; repeating the steps until it is determined that the e symbols form the unknown field.

Abstract: The method according to the invention consists of producing a real cartography of the magnetic field radiated by the circuit placed in a predetermined operating state. It includes the following steps: a) applying a transform to an initial hypothesis on the nature of the defect, to obtain a current hypothesis, b) superimposing the current hypothesis on an initial topology of the circuit to obtain a current topology; c) simulating the magnetic field generated by the current topology, so as to obtain a current simulated cartography; d) estimating the current value of a correlation function between the measured cartography and the current simulated cartography; and e) iterating steps a) to d) to seek a maximum of the correlation function by modifying the value of said characteristic parameter of the defect.

Abstract: An antenna uses a photonic forbidden band (PFB) material in which, by default, a surface (26) for injecting and/or receiving electromagnetic waves in a resonance cavity of the antenna (8) has at least a width or a length of a diameter higher than or equal to the wavelength of the working frequency.