Abstract: The present disclosure concerns a broadband hyperspectral imaging spectrophotometer configured to analyze an object and includes an illumination assembly having a source for emitting a light beam and configured so that the light beam scans line by line the object to be analyzed, a focusing mirror, a first mirror folding, and a planar scanning mirror movable in rotation. The illumination assembly, the focusing mirror, the first folding mirror and the planar mirror are arranged to bring the light beam to the object along a line which will be displaced on the object via the scanning mirror. The imaging spectrophotometer further includes two measuring sensors by a distance between the object and the scanning mirror. The focusing mirror is movable in translation to adapt the imager to the measured distance by the measuring sensors.

Abstract: Disclosed is an architecture for observing a plurality of objects arranged in geographically separate locations, including: a processing center connected to a global computer network, and at least one airliner. The at least one airlines includes: a cabin system including a local network, a first external communication module, a second external communication module, and an intermediate communication module connected to the first external communication module by the local network and to the second external communication module by the local network, the intermediate communication module communicating digital data including observation data between the second external communication module and the first external communication module via the local network.

Abstract: The present disclosure relates to a method and a device for reconstructing a useful signal from an acquired signal made up of a plurality of samples representing physical quantities measured. The acquired signal includes the useful signal made noisy by a noise. The method includes decomposing the acquired signal on a predetermined wavelet decomposition base according to a given number of decomposition levels, and obtaining corresponding wavelet coefficients representing the acquired signal. The method further estimates a value representing the standard deviation of the noise from at least one portion of the wavelet coefficients; and implements an iterative method for reconstructing parsimonious signals on the acquired signal with a dictionary built from the wavelet decomposition base. The iterative method has an associated stop criterion that is calculated as a function of the value representing the estimated noise.

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 discloses a constellation of relay vehicles comprising a receiver of navigation signals and a transmitter of positioning signals to an area of service where a number of rovers manoeuver, wherein the position of the relay vehicle may be adjusted to optimize one or more of an SNR or a DOP index of the positioning signals. In some embodiments, the optimal configuration of the constellation of relay vehicles may be further defined based on priority indexes allocated to the rovers. The invention is applicable to terrestrial or underwater rovers, respectively serviced by aerial or nautical relay vehicles.

Abstract: A deformable mirror comprises a deformable membrane extending at rest in a first plane and having a reflecting front face and a back face opposite the front face, a supporting structure, an actuator having a first and second end, the first end fixed to the supporting structure, the second end displaced relative to the first end on a first axis substantially at right angles to the first plane to exert, on the back face, an axial load on the first axis, to locally deform the deformable membrane. The mirror comprises a plate that is substantially flat in a second plane substantially parallel to the first plane, positioned between the actuator and deformable membrane, linked to the back face and deformed when the actuator exerts the axial load, and the plate is rigid in the second plane to take up loads applied to the mirror in the second plane.

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: The invention refers to a GNSS receiver, and associated method, for calculating a position from positioning signals transmitted by a plurality of GNSS transmitters, said receiver comprising a first and a second signal acquisition elements (301) having different polarizations, the receiver being configured to process the signals received on said first signal acquisition element to calculate first pseudo range measurements (203), and the signals received on said second signal acquisition element to calculate second pseudo range measurements (303) and associated quality indicators (304), said receiver comprising a calculation circuit (306) configured to: select at least one of the second pseudo range measurements depending on the quality indicators, and compare it with the corresponding first pseudo range measurement, and select at least three first pseudo range measurements based on the comparison results to calculate a position (204).

Abstract: The invention discloses an antenna assembly that may be connected to a standard GNSS receiver. The antenna assembly comprises antenna elements that are configured to shape a radiating pattern which is directional in a direction of movement of the GNSS receiver and which has a FOV above the receiver that may be limited. The signals received in LOS will then have a much better C/N0 than the Non-LOS signals. In some embodiments, the FOV may be twisted leftwards or rightwards depending on a configuration of a vehicle carrying the receiver. In some embodiments, the antenna assembly is capable of operating in a plurality of modes that will differ notably by the FOV of the radiating pattern above the receiver. Switching between modes may be triggered manually or automatically and may be based on a determination of the prevalence and/or type of multipath reflections in the area where the rover moves.

Abstract: An inertial actuation magnetohydrodynamic wheel (2) comprising a torus-shaped fluid ring (3) filled with a conductive liquid, at least one effective area (24, 26, 28) for setting the liquid into motion, and at least one magnetohydrodynamic pump (4, 6, 8). The ratio of the set back distance of any magnetic conduction element (24, 26, 28) of the air gap of any electromagnetic pump (4, 6, 8) over the internal size of the fluid ring (3) is greater than or equal to 0.5 and the fluid ring (3) comprises at least two distinct effective areas (24, 26), for setting the conductive liquid into motion, angularly spaced apart by at least 120°.

Abstract: The invention relates to an access point for transmitting non-GNSS signals using a wireless RF communication standard, the access point being further configured to transmit GNSS-like signals in at least one communication channel dedicated to the transmission of non-GNSS signals; an access point infrastructure comprising at least one of said access points; and a receiver for receiving GNSS and non-GNSS wireless signals, the receiver being further configured to receive at least one GNSS-like signal in a communication channel dedicated to said non-GNSS wireless signal, and to use said GNSS-like signal to determine its position. The invention further relates to a positioning system comprising at least one receiver in said access point architecture and an associated method for determining a position.

Abstract: This machine includes a tool (30) actuated by an actuating module (32); a dual-frequency satellite positioning module (40) able to take into account corrections relative to the disruptions affecting the propagation of radio navigation signals emitted by each of the visible radio navigation satellites and that are caused by the ionosphere, so as to determine an absolute position of the machine, and consequently of the tool, which is precise to within a centimeter; and a computer (50) able to compare the instantaneous absolute position of the tool and an absolute position of a current revisiting point, selected from among the revisiting points of a revisiting plan, the computer then being able to command the actuation module.

Abstract: This invention relates to a propulsion bay to be transported, at least temporarily, in a space launch vehicle and comprising an adapter that co-operates with at least one system located, at least temporarily, on board the bay, said system comprising an electrical power supply. The bay is characterized in that it also comprises at least one electric space propulsion engine that can be powered by the power supply of the system.

Abstract: The invention discloses a positioning device configured to acquire its own GNSS position, the GNSS positions of rovers in an area around the positioning device and the relative positions of the positioning device to the rovers. The positioning device is configured to calculate a best-fit position based on this data and their confidence indexes. The positioning devices may communicate directly or through a navigation assistance centre. The best-fit position may be provided with indexes of confidence, availability and integrity. In some embodiments, the positioning device of the invention may be robust enough to generate commands to the driving controls of an autonomous vehicle.

Abstract: A satellite comprises at least one first communication module, a repeater module, one or more antennas, at least one propulsion module and an avionics module, the repeater module comprising: a north first panel when the satellite is in an orbital position, an east second panel, a south third panel and a west fourth panel arranged respectively opposite the north first panel and the east second panel, the north panel and the south panel having widths XmcR in the east-west direction, the east panel and the west panel having a width or YmcR in the north-south direction; characterized in that: the value of the ratio XmcR/YmcR for the repeater module lies within the interval [0.84; 1.12], and the repeater module consists of a number of floors, and the value of Xmck varies as a function of the floor k and of its position in the repeater module.

Abstract: Receiver and method for receiving one or more RF signals, the RF signals comprising a component relative to a direct propagation path and, depending on a propagation environment, one or more additional components relative to reflected propagation paths, the receiver comprising a calculation circuit configured to: compute at least a first correlation function (310) between the received signal and at least a replica of a RF signal generated at the receiver, and for at least an output of said first correlation function: perform a cepstrum transform (410), search for one or more reflected propagation paths from the output of the cepstrum transform (411), and when reflected propagation paths are detected, determine the associated propagation characteristics (412), and remove the contribution of the detected reflected propagation paths from one of the received signal or the output of the first correlation function.

Abstract: The invention relates to a method and device for characterising at least one optical aberration of an optical system of an image acquisition device, the optical system having an associated optical transfer function that is dependent on the aberrations, the image acquisition device being capable of acquiring at least two images in a field of image capture in a manner so as to introduce a differential aberration between the two images, each image being defined by a digital image signal. The method includes the obtaining (50) of a first image and a second image of a same given zone of the field of image capture, the second image being acquired with a differential aberration (?aberr) relative to the first image, each image acquisition having an associated optical transfer function.

Abstract: The invention discloses an authentication system of objects, physical or virtual, comprising an authentication mark and, as an option, an authentication message, generated by an authentication device and controlled by a verification/decoding device in combination with an authentication server managed by an authenticating authority. The authentication mark in the tag/message may comprise GNSS RF raw signals and/or GNSS raw data. The authentication mark comprises data and may be formatted, for example, in a bitstream, a data stream, a QRCode, an RFID tag or an NFC tag. The authentication server is configured to cause a GNSS signals simulator to reproduce the GNSS RF raw signals and/or GNSS raw data at the location and time interval of production of the object and to compare the results of the simulation to the authentication mark comprising data received directly from the authentication device or received from a verification device and issue a validation, a denial or a doubt from the comparison.

Abstract: The invention relates to a multibeam source for a multibeam antenna, the source comprising a plurality of identical basic sources, such that the basic sources are combined into identical subnetworks around a central basic source, each subnetwork forming a beam, and such that two adjacent subnetworks comprise at least one common basic source, wherein the source includes: a supply and polarization stage for supplying power to the central basic sources and polarizing the electromagnetic field at the accesses of the central basic sources; and a stage for distributing the power from the central basic sources among the basic sources of the corresponding subnetwork and those common to a plurality of subnetworks according to a predetermined amplitude law.

Abstract: The invention relates to a daytime and nighttime stellar sensor (1), comprising: at least one video camera (2) suitable for taking images of stars (3) in the sky; and a control unit (4), characterized in that it furthermore comprises: a polarizer (5), the control unit (4) being configured: to obtain an estimation of a direction of polarization of the polarized light received from the sky by the video camera (2); and to control the orientation of the polarizer (5) so that said polarizer (5) filters polarized light from the sky directed toward the video camera (2) and having said polarization direction.