CENTRE NATIONAL D'ETUDES SPATIALES Patent applications |
Patent application number | Title | Published |
20150242445 | DEVICE FOR OPTICAL TIME-STAMPING, AND RELATED IMAGE-SENSING SYSTEM AND OPTICAL TIME-STAMPING METHOD - 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. | 08-27-2015 |
20150048996 | COMPACT HELICAL ANTENNA WITH A SINUSOIDAL PROFILE MODULATING A FRACTAL PATTERN - The invention concerns a helical antenna comprising a shape of revolution and a plurality of radiating strands helically wound around the shape of revolution, characterised in that each radiating strand is defined by a repetition of a fractal pattern comprising segments formed by a sinusoidal curve. | 02-19-2015 |
20140203824 | MULTI-ELECTRODE SENSOR FOR DETERMINING THE GAS CONTENT IN A TWO-PHASE FLOW - A sensor for determining gas content of a two phase fluid flowing in a flow line, the sensor including a sleeve configured to be arranged in the flow line in a stream of fluid. The sleeve includes a plurality of measurement electrodes that, in pairs, define a plurality of subdivision spaces subdividing a flow section of the sleeve. The sensor also includes switch and measurement members coupled to the measurement electrodes to control switching of each subdivision space of the sleeve between a measuring state and a non-measuring state. The switch and measurement members are configured to selectively switch the state of each of the subdivision spaces independently of one another. | 07-24-2014 |
20140191903 | Radionavigation signal tracking device - A radionavigation signal tracking device comprises a first and a second tracking stage for radionavigation signals. The first tracking stage comprises a first carrier phase-locked loop. The latter produces a first error signal arising from a phase difference between the first carrier and its replica. The phase of the replica of the first carrier is adjusted with the first error signal. The second tracking stage comprises a second carrier phase-locked loop. The latter produces a second error signal arising from a difference between the first phase difference and a phase difference between the second carrier and the replica thereof. The phase of the replica of the second carrier is adjusted with the first and second error signals. | 07-10-2014 |
20140136923 | METHOD FOR ENCODING DATA IN BURSTS - A process of encoding information data in a sequence of bursts ( . . . , B | 05-15-2014 |
20140091878 | Compact Multi-Port Router Device - 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, characterised in that it includes at least two filters ( | 04-03-2014 |
20130336422 | Method for calibrating a linearizer and linearized electronic component - Method for calibrating a linearizer and linearized electronic component The method comprises predistortion, in a predistortion linearizer, of a signal upstream of an electronic component to compensate nonlinear distortion. Determining predistortion setting parameters comprises applying a bifrequency test signal to the component and measuring the relative amplitudes of the lines at the output of the component. A variable indicative of the magnitude |K | 12-19-2013 |
20130305685 | Novel Ionic Micropropellants Based on N2O for Space Propulsion - Novel monopropellants are provided. The monopropellants are based on N | 11-21-2013 |
20130301988 | POLARIZATION-INSENSITIVE OPTICAL FILTER WHICH HAS RESONANT GRATINGS AND IS ADJUSTABLE ACCORDING TO THE INCIDENCE ANGLE - The invention relates to a polarization-insensitive optical filter centered on a wavelength (λ | 11-14-2013 |
20130290817 | Method for correcting messages containing bit stuffing - 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. | 10-31-2013 |
20130275841 | DECODING METHOD AND DECODER - 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. | 10-17-2013 |
20130210424 | HIGH CAPACITY HYBRID TERRESTRIAL/SATELLITE CELLULAR RADIO COMMUNICATION SYSTEM - A hybrid cellular radiocommunication system includes base stations defining terrestrial cells covered by satellite umbrella cells. The base stations are distributed so as to be distinguishable by the satellite cell according to a time-invariant distribution function, and the system includes a device for maintaining, permanently and in the same link direction, congruence of the coverage of each satellite cell with respect to coverage of the terrestrial cells associated with the base stations contained in the satellite cell, with coverage of a satellite cell being congruent with a predetermined terrestrial coverage set when the predetermined coverage set is included in the satellite coverage. | 08-15-2013 |
20130058271 | Method for detecting AIS messages - 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. | 03-07-2013 |
20130034050 | SYSTEM AND METHOD FOR MANAGING MULTIPLE TRANSMISSION RESOURCES OF A SPATIAL MULTI-CELL RADIO-COMMUNICATION SYSTEM - 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. | 02-07-2013 |
20120314452 | METHOD FOR DC-DC CONVERSION USING A DC ELECTRIC POWER SOURCE - 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. | 12-13-2012 |
20120198818 | AUGMENTATION OF A MONOPROPELLANT PROPULSION SYSTEM - 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. | 08-09-2012 |
20120116734 | Method of characterizing an electrical defect affecting an electronic circuit, related device and information recording medium - 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. | 05-10-2012 |
20120092225 | Deformable reflecting membrane for reconfigurable reflector, reconfigurable antenna reflector and antenna including such a membrane - A deformable reflecting membrane includes, in thickness, an alternating superposition of layers of conductive elastomer and at least two reinforcing layers, each reinforcing layer being divided up into individual patches spaced apart from one another and distributed periodically in the plane of the reinforcing layer. The membrane is applicable notably to the space domain. | 04-19-2012 |
20120032867 | WAVEGUIDE ORTHOMODE TRANSDUCER - A waveguide orthomode transducer, comprises: a junction having a main waveguide and four auxiliary waveguides lying along the two orthogonal main axis of the junction and defining four quadrants; a combination network comprising: two magic tees, each having an E-port, two opposed common-ports, and a H-port; an H-plane tee junction having a Σ-port and two opposed common-ports; and an E-plane tee junction having a Δ-port and two opposed common-ports. Two auxiliary waveguides define a first quadrant are respectively connected to the common-ports of one of the magic tees and the two other secondary waveguides defining a second quadrant opposite to the first quadrant are connected to the common-ports of the other magic tee. The tee junctions are used to connect similar magic tee ports so that the transducer separates towards two different outputs two orthogonally polarized signals entering at the main waveguide. Reciprocally, two signals entering respectively in the Σ-port and the Δ-port of the tees junctions are combined with orthogonal polarizations in the main waveguide. | 02-09-2012 |
20120001799 | GEOPOSITIONING METHOD USING ASSISTANCE DATA - In order to enable a geopositioning receiver of a user to resolve phase ambiguities without necessarily using multi-frequency observations, assistance data is developed thanks to measurements made at a reference network ( | 01-05-2012 |
20110280347 | Method for demodulating signals from a multi-access system able to collide and equipment for implementing same - A method for demodulating time-multiplexed signals able to mutually collide, in particular in the case of an AIS (Automatic Identification System), being a communications system between ships allows collisions between these ships to be limited and allows the maritime traffic in view from the coasts to be monitored thanks to coastal stations that listen to the communications. When these colliding signals are sufficiently “distinct” (in frequency, in power or in time), algorithms exist for discriminating between them. The demodulator offers the possibility of demodulating two colliding signals, whose collision parameters (difference in frequency, in power or their non-synchronization) are sufficiently small to make them virtually inaccessible otherwise. The method and equipment allow the satellite AIS system to utilize cases of signal collisions that were hitherto detrimental in order to improve the overall performance. | 11-17-2011 |
20110279320 | SYSTEM FOR EMITTING ELECTROMAGNETIC BEAMS, COMPRISING A NETWORK OF ANTENNAE - This invention relates to a system for emitting electromagnetic beams, comprising a network of elements for the far-field emission of electromagnetic beams, the signals coming from and/or arriving towards each element weighted by excitation coefficients digitally determined by calculation means. According to the invention, the system comprises: a second separate network of sensors arranged close to the network of radiating elements in order to measure the near field radiated by the elements, means for calculating the far field radiated by the network from the near field actually measured by the sensors, and means for calculating the correction of the excitation coefficients of the elements from the difference between the far field calculated from the measurement of the near field and a pre-determined nominal far field. | 11-17-2011 |
20110264799 | METHOD FOR MEASURING THE PERFORMANCE OF AN IP NETWORK AND ASSOCIATED SYSTEM - The invention relates to a method for measuring the performance of a network ( | 10-27-2011 |
20110210888 | PROCESSING OF RADIONAVIGATION SIGNALS USING A WIDE-LANE COMBINATION - A method for processing radionavigation signals coming from satellites that broadcast the radionavigation signals on at least two distinct frequencies, comprises
| 09-01-2011 |
20110199616 | PROCESS AND INSTRUMENT FOR RECONSTRUCTION OF AN IRREGULARLY SAMPLED NARROW-BAND SIGNAL - According to a first aspect the invention relates to a reconstruction process of a narrow-band signal acquired by an instrument producing irregular sampling, in which two series of samples are acquired at the same sampling period, the two series being offset relative to one another such that the sampling errors are identical or quasi identical over both series. According to a second aspect, the invention relates to an instrument configured to carry out the process according to the first aspect of the invention. | 08-18-2011 |
20110185766 | Refrigerator, and Method for Producing Very Low Temperature Cold - The invention relates to a method for producing very low temperature cold through a dilution cycle wherein a two-phase mixture of the two isotopes | 08-04-2011 |
20110129002 | METHOD FOR THE ACQUISITION OF RADIONAVIGATION SIGNALS CARRYING SPREADING CODE WITH A QUASI-INFINITE PERIOD - 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. | 06-02-2011 |
20110050498 | CLOSED SHAPE BEAM FORMING NETWORK - The invention concerns a network for distributing a plurality of input microwave signals into a plurality of output signals having a Gaussian amplitude and in-phase distribution per said input signal, the network comprising: a plurality of N input ports providing N different input signals; a plurality of M output ports, M being a multiple number of N; a plurality of P layers disposed between the inputs ports and the outputs ports, the input signals being distributed through these layers, each layer comprising an arrangement of power combiners (C) and/or power dividers (D), the arrangement is self similar with an angular rotation of k2ρ/N radian around the symmetry axis (AA′) of the polygonal closed shape formed by said input ports, k being an integer comprised between 1 and N. | 03-03-2011 |
20110013675 | METHOD OF RECEPTION AND RECEIVER FOR A RADIO NAVIGATION SIGNAL MODULATED BY A CBOC OR TMBOC SPREAD WAVEFORM - To receive a radio navigation signal modulated by a modulation waveform, the modulation waveform comprising a component BOC(n | 01-20-2011 |
20100321261 | ANTENNA WITH RESONATOR HAVING A FILTERING COATING AND SYSTEM INCLUDING SUCH ANTENNA - The invention relates to an antenna for transmitting or receiving electromagnetic waves at a working frequency f | 12-23-2010 |
20100244657 | HALL EFFECT ION EJECTION DEVICE - The disclosure relates to a Hall-effect ion ejection device that comprises a longitudinal axis substantially parallel to the ion ejection direction, and comprises at least: a main ionization and acceleration annular channel, the annular channel being open at its end; an anode extending inside the channel; a cathode extending outside the channel at the outlet thereof; a magnetic circuit for generating a magnetic field in a portion of the annular channel, said circuit including at least an annular inner wall, an annular outer wall and a bottom connecting the inner and outer annular walls and defining the downstream portion of the magnetic circuit; characterised in that the magnetic circuit is arranged so as to create at the outlet of the annular channel a magnetic field independent from the azimuth. | 09-30-2010 |
20100241379 | METHOD OF ANALYZING AN INTEGRATED CIRCUIT, METHOD OF OBSERVATION AND THEIR ASSOCIATED INSTALLATIONS - A method for analyzing an integrated circuit includes: a step ( | 09-23-2010 |
20100239158 | FINE STEREOSCOPIC IMAGE MATCHING AND DEDICATED INSTRUMENT HAVING A LOW STEREOSCOPIC COEFFICIENT - The invention relates to a method and system for the acquisition and correlation matching of points belonging to a stereoscopic pair of images, whereby the pair is formed by a first image and a second image representing a scene. According to the invention, the two images of the pair are acquired with a single acquisition instrument ( | 09-23-2010 |
20100194665 | ANTENNA OF THE HELIX TYPE HAVING RADIATING STRANDS WITH A SINUSOIDAL PATTERN AND ASSOCIATED MANUFACTURING PROCESS - The invention relates to an antenna of the helix type, comprising a plurality of radiating strands wound in a helix in an axisymmetric form ( | 08-05-2010 |
20100156752 | HELIX ANTENNA - The invention relates to a helix antenna comprising a plurality of radiating elements wound helically in an axisymmetric shape ( | 06-24-2010 |
20100154558 | METHOD AND INSTALLATION FOR EXPOSING THE SURFACE OF AN INTEGRATED CIRCUIT - The invention relates to a method for exposing an integrated circuit by ablating the polymer coating initially covering the integrated circuit, characterised in that it comprises the combined application of a laser radiation and a plasma onto the coating initially covering the integrated circuit. | 06-24-2010 |
20100134800 | METHOD FOR CALIBRATING INTERPIXEL GAINS OF AN INTERFEROMETER - 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. | 06-03-2010 |
20100085252 | METHOD FOR PROCESSING RADIONAVIGATION SIGNALS - The satellites of a constellation of satellites each transmit, on distinct frequencies, a first and a second radionavigation signal, respectively. Each station of a reference network from which a satellite is visible performs non-differentiated measurements of code and phase for each of the two signals originating from the satellite and deduces therefrom a raw value of the widelane ambiguity. An internal delay of the satellite and a whole value of the widelane ambiguity are determined, in the network, on the basis of this raw value. The method comprises the steps: -receiving the first and second radionavigation signals at the level of the reference receiver; -performing, with the aid of the reference receiver and for each of the first and second signals received, a non-differentiated measurement of code and a non-differentiated measurement of phase; -calculating the raw value of the widelane ambiguity on the basis of the non-differentiated measurements of code and phase; and -fixing the internal delay of the satellite and the whole value of the widelane ambiguity on the basis of the raw value for the reference receiver. | 04-08-2010 |
20100060543 | ANTENNA HAVING OBLIQUE RADIATING ELEMENTS - The invention relates to an antenna comprising a plurality of metallic elements ( | 03-11-2010 |
20100026606 | ANTENNA USING A PBG (PHOTONIC BAND GAP) MATERIAL, AND SYSTEM AND METHOD USING THIS ANTENNA - An antenna uses a photonic forbidden band (PFB) material in which, by default, a surface ( | 02-04-2010 |
20090289847 | METHOD OF RECEPTION AND RECEIVER FOR A RADIO NAVIGATION SIGNAL MODULATED BY A CBOC SPREAD WAVE FORM - To receive a radio navigation signal modulated by a composite wave form, the composite wave form comprising a linear combination with real coefficients of a component BOC(n | 11-26-2009 |