Abstract: A device and the associated method for detecting spoofing of GNSS signals are provided. The device includes an RF chain to acquire and down convert a signal comprising one or more GNSS signals transmitted by GNSS sources, each of the GNSS signals comprising a navigation message modulated by a spreading code associated to a related GNSS source, an analog to digital converter, to digitize the down converted signal, and a computer logic, to: calculate over a grid of spreading code phase delays and Doppler shifts, cross-correlation functions between the digitized signal and locally generated replicas of the signal, for one or more of the spreading codes, identify cross-correlation peaks, and analyze the cross-correlation peaks to detect spoofing situations.

Abstract: A reusable device for holding and releasing a bar. The device includes a tightening component, a hold and release component, and at least one loosening component. The hold and release component includes a plurality of segments, each segment includes a first bearing surface configured to bear on part of the bar, when the plurality of segments is in a holding configuration under the effect of a tightening pressure generated by the tightening component. The plurality of segments includes a second bearing surface configured to bear on one end of the at least one loosening component. The at least one loosening component is made from a first single-acting shape memory material. Each end of the at least one loosening component exerting a loosening pressure compensating for the tightening pressure, so as to place the hold and release component in a configuration in which the part of the arm is released.

Abstract: A damper for an object is placed in a medium subjected to vibrations. The damper has an idle state in the absence of vibrations, a first operating state in case of vibrations of a first type, and a second operating state in case of vibrations of a second type. The level of each vibration of the first type is less than the level of each vibration of the second type. The damper includes an outer support structure, an inner support structure, and at least one pair of membranes formed of a first membrane and a second membrane. Each membrane is formed of a viscoelastic material including fibers aligned substantially in a same direction.

Abstract: A terminal to calculate a position and detect spoofing, the terminal includes a receiver of first signals, notably signals of a GNSS type, from first sources, to compute a first information relative to its position, as for instance a pseudo range measurement, an ephemeris, a navigation message, spatial coordinates or temporal coordinates, and to calculate a position; a receiver of a second signal of a non-RF and non-GNSS type from a second source, notably from an optical display, the second signal comprising a second information transmitted using a predetermined encoding format to retrieve said second information; a processing logic configured to detect spoofing by comparing the first and second information. The associated transmitters, authentication server and spoofing detection methods are also provided.

Abstract: A positioning device includes a first GNSS receiver; a communication link configured to receive a spatial position, code measurements and carrier phase measurements of a second GNSS receiver; an input interface to a processing logic, the processing logic being configured to: calculate a position of the first positioning device from communicated data; and to estimate one or more parameters representative of multipath at the position of the first positioning device; wherein the communication link is configured to communicate to a second positioning device the parameters representative of multipath at the position of the first positioning device. Described developments comprise the use of multipath severity indicators, the determination of relative distances between receivers, validity conditions in time and/or space of multipath, various embodiments in a train or in a group of vehicles. Software aspects are discussed.

Abstract: A propulsion assembly for a rocket includes a propellant tank configured to contain a propellant and an engine comprising a combustion chamber configured to subject the propellant to combustion and generate exhaust gases. The propulsion assembly further includes a supply circuit and an exhaust gas circuit. The supply circuit is disposed between the propellant tank and the combustion chamber, and the supply circuit is configured to supply the combustion chamber with the propellant. The exhaust gas circuit is disposed between the combustion chamber and the propellant tank, and the exhaust gas circuit is configured to convey at least part of the exhaust gases from the combustion chamber to the propellant tank to provide pressurization of the propellant tank.

Abstract: There is disclosed a system for locating an object on a surface waveguide. The surface waveguide is made of one or more 1D wires and/or 2D waveguides comprising conductive elements arranged in patterns. Emitters with known positions can couple with receivers coupled with the surface waveguide. The position of receivers can be determined, for example by multilateration or signal strength indication. Conductive elements can be sprayed or sewed or otherwise deposited onto surfaces such as a ground floor, a sidewalk or a road lane. Described developments comprise the use of absorbers, protective layers, unidirectional emitters, contactless coupling, and various arrangements comprising frequency-selective layers, arrangements in lattices, trellis or anisotropic surfaces. Signal processing aspects and software embodiments are also described.

Abstract: The present invention relates to a telecommunications satellite intended for being placed in earth orbit, comprising an antenna comprising a reflector and a network of sources. In addition, said satellite comprises adaptive analog beamforming networks, said adaptive analog beamforming networks being connected to respective groups of sources other than the network of sources. Each adaptive analog beamforming network is suitable for simultaneously activating a predetermined number of beams serving respective geographic zones inside a geographic region on Earth's surface. Each of group of sources comprises sources shared with other groups of sources, and at least one geographic region has a geographic overlap of at least 30% with other geographic regions.

Abstract: The present disclosure relates to a multilayer electromagnetic waveguide that includes a plurality of layers forming guide channels for an electromagnetic wave, and at least one transition device including at least one dielectric layer between two guide channels, referred to as coupled guide channels, extending as an extension. Each transition device includes at least one adaptation channel extending in a longitudinal direction, and each adaptation channel is defined by two electrically conductive walls. At least one wall extends along the dielectric spacer layer from one end of the coupled guide channel, over a length suitable for optimizing the transmission of an electromagnetic wave between the two coupled guide channels.

Abstract: A method for estimating the ageing of a battery powering an electrical system. A set of data about the voltage and current across the battery terminals, in response to the current perturbations provoked during the normal operation of the battery by the changes of consumption rate of the electrical system are stored. The impedance of the battery, within a predetermined frequency interval, from the voltage and current data is determined. The age of the battery as a function of the impedance is estimated by comparing the impedance with a previously stored model of evolution of this impedance with ageing.

Abstract: The present disclosure relates to a multilayer electromagnetic waveguide that includes a plurality of layers forming guide channels for an electromagnetic wave, and at least one transition device including at least one dielectric layer between two guide channels, referred to as coupled guide channels, extending as an extension. Each transition device includes at least one adaptation channel extending in a longitudinal direction, and each adaptation channel is defined by two electrically conductive walls. At least one wall extends along the dielectric spacer layer from one end of the coupled guide channel, over a length suitable for optimizing the transmission of an electromagnetic wave between the two coupled guide channels.

Abstract: A telecommunications satellite stabilized on three axes includes a set of dissipative equipment constituting a payload of the satellite. The satellite includes support data transmission antennas and is substantially parallelepipedal in shape with the panels forming two opposite faces, east and west faces. The panels form two additional opposite faces, north and south faces, and include radiator surfaces on their external faces. The radiator surfaces are configured to cool the electronic equipment of the satellite. The equipment installed on the north and south panels dissipate thermal power corresponding to less than 25% of the total dissipated power.

Abstract: A photovoltaic generator deployable for a satellite stabilized on three axes. The photovoltaic generator includes an assembly of planar panels articulated with respect to each other, and an attachment arm to the structure of the body of the satellite. In a first or launch position of the photovoltaic generator, the planar panels are folded one over the other. In a second or deployed position of the photovoltaic generator, the planar panels are fully deployed with at least a part of the planar panels being photovoltaic panels. At least one planar panel consists of a thermal radiator, with the radiative face thereof being orientated to be opposite the face of the photovoltaic panels carrying the photovoltaic sensors when the photovoltaic generator is in the deployed position. This radiative face is termed the “shade” face, and the face opposite the panel shaped radiator is termed the “sun” face.

Abstract: A distributed amplification device with p inputs, p outputs, p amplification paths comprises a redundant reservoir of n amplifiers including n-p back-up amplifiers, an input redundancy ring and an output redundancy ring formed by rotary switches, the input and output redundancy rings sharing the same technology. The internal amplification pathways associated with the n-p back-up amplifiers frame in an interlaced manner the internal amplification pathways associated with the p nominal amplifiers and the amplification paths of the routing configurations each pass through at least five rotary switches. The input and output redundancy rings are topologically and geometrically configured and the family of the routing configurations is chosen such that the electrical lengths of all the paths of one and the same routing configuration of the family are equal.

Abstract: A method for calibrating spatial errors induced by phase biases having a detrimental effect on the measurements of phase differences of radio signals received by three unaligned receiving antennas of a vehicle. An inter-satellite angular deviation of a pair of satellites is estimated in two different ways: on the basis of the respective positions of the vehicle and of the satellites to obtain a theoretical inter-satellite angular deviation; and on the basis of the respective directions of incidence of the satellites relative to the vehicle, which are determined from phase measurements, to obtain an estimated inter-satellite angular deviation. The space errors are estimated on the basis of said theoretical and estimated inter-satellite angular deviations. Also, a method and system for estimating the attitude of a vehicle, in particular a spacecraft.

Abstract: A device (1) for assisting with physical exertion management, includes a physiological sensor, a positioning device, at least one memory in which data representative of the itinerary to be travelled during the physical exertion can be recorded, and at least one data processing unit organised so as to produce forecast data representative of the change in an physical exertion parameter over the remaining itinerary to be travelled by the individual, to compare these forecast data with predetermined data, and to produce and transmit a message, the content of which depends on the result of the comparison of the forecast data and the predetermined data, with a view to communicating the message to a user.

Abstract: An arrangement of a biconical annular seal having a laid down V shaped cross-section, in an annular groove having a trapezoid shaped cross-section, a small base of the trapezoid corresponding to a cylindrical bottom of the groove and being radially inwardly open at a great base of the trapezoid. The seal includes a radially outer annular heel and two generally conical annular wings extending radially inwardly from the heel, an inner radial end of each wing being axially bearing against an associated wall of the groove. The seal is mounted in the groove such that the heel of the seal is located radially distal to a bottom of the groove.

Abstract: A method for controlling an attitude control system (30) for a space vehicle (10), the attitude of the space vehicle being controlled during at least one preparation phase followed by an observation phase during which an image capture is performed. In an attitude control system that includes a maneuvering subsystem (300) which includes at least one reaction wheel, the method includes, during the at least one preparation phase, a preparation step (50), during which commands are issued to the maneuvering subsystem in order to control the attitude of the space vehicle, followed by a step (55) of stopping the at least one reaction wheel prior to the observation phase. In addition, during the observation phase, a fine control subsystem (310) having a lower vibration signature than that of the maneuvering subsystem, is sent commands in order to control the space vehicle's attitude. An attitude control system for a space vehicle is also described.

Abstract: A method includes estimating the position of the moving object on the basis of the reception of navigation signals emitted by a constellation of satellites, the navigation signals being modulated by a code and the receiver comprising a local replica of the code. The determination of the confidence indicator consists in estimating a speed of displacement of the receiver over an identified trajectory segment, deducing therefrom a Doppler delay function corresponding to the motion of the receiver, in correcting the auto-correlation function of the GNSS navigation signal received from each satellite of the constellation by means of the delay function, in comparing the corrected auto-correlation function with a theoretical auto-correlation function by applying a quadratic criterion corresponding to the confidence indicator.

Abstract: A feed system for feeding a rocket engine with a liquid propellant includes a feed circuit, and a device to vary a volume of gas in the feed circuit. The device is configured to cause a volume of gas in the feed circuit to vary while the rocket engine is in operation. The device to vary gas volume includes at least one variable-flow-rate gas injector to inject gas into the liquid propellant in the feed circuit. Methods of suppressing a POGO effect are also provided.