公开(公告)号：US20250102304A1

公开(公告)日：2025-03-27

申请号：US18576958

申请日：2022-07-07

Applicant: EXAIL ,  CENTRE NATIONAL D'ETUDES SPATIALES

Inventor： Eric DUCLOUX

IPC: G01C19/72

Abstract: This relates to an interferometer including a light generator, a fibre-optic coil, an optical coupler/splitter, a photodetector and an electronic signal-processing system. The light generator includes a laser source able to emit a source beam split into two secondary beams passing through the coil with a travel time τ defining a natural frequency f p = 1 2 ⁢ τ . According to the invention, the laser source is a monofrequency laser source and the light generator includes modulation means designed to modulate the source beam at a modulation frequency equal to 2 ⁢ f p 2 ⁢ n + 1 where n is an integer greater than or equal to 1, and the photodetector and the electronic signal-processing system are configured to acquire and process a signal representative of the interference beam at a demodulation frequency equal to f p 2 ⁢ n + 1 .

公开(公告)号：US20240241253A1

公开(公告)日：2024-07-18

申请号：US18560072

申请日：2022-04-26

Applicant: OFFICE NATIONAL D'ETUDES ET DE RECHERCHES AÉROSPATIALES ,  CENTRE NATIONAL D'ETUDES SPATIALES C N E S

Inventor： François LEMAITRE ,  Nicolas CEZARD ,  Philippe-Jean HEBERT

IPC: G01S17/26 ,  G01S7/484 ,  G01S7/4861

CPC classification number: G01S17/26 ,  G01S7/484 ,  G01S7/4861

Abstract: A LIDAR system which is intended for performing distance measurements is adapted to implement a pulse-compression effect. To this end, a transmission path of the LIDAR system includes two transfer pathways which are arranged in parallel, and at least one of the transfer pathways includes a pulse-compression modulator. A detection path of the LIDAR system includes a digital processing module configured to calculate a correlation function between measurement detection signals and reference detection signals. The improvements of double heterodyne detection and a comb-shaped pulse spectrum may optionally be used.

公开(公告)号：US11846713B2

公开(公告)日：2023-12-19

申请号：US16964033

申请日：2019-01-17

Applicant: CENTRE NATIONAL D'ETUDES SPATIALES

Inventor： François-Xavier Marmet

IPC: G01S19/24 ,  G01S19/25

CPC classification number: G01S19/243 ,  G01S19/252 ,  G01S19/254 ,  G01S19/256

Abstract: A Global Navigation Satellite System (GNSS) positioning techniques is provided. A method to improve the time required to compute a position measurement in a GNSS receiver, and the time required to make this position measurement accurate is also provided. The method comprises computing a snapshot PVT (Position Velocity and Time) measurement, and use it to reduce the time required to acquire new signals to compute a conventional PVT measurement. A receiver implementing the method is further provided.

公开(公告)号：US20230058595A1

公开(公告)日：2023-02-23

申请号：US17793199

申请日：2021-01-22

Applicant: THALES ,  CENTRE NATIONAL D'ETUDES SPATIALES ,  UNIVERSITE PAUL SABATIER TOULOUSE III ,  CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE

Inventor： Frédéric VERON ,  Olivier VENDIER ,  Philippe TAILHADES ,  Valérie BACO-CARLES ,  Kateryna KIRYUKHINA

IPC: B22F12/40 ,  B22F10/28 ,  B22F1/145 ,  B22F1/16 ,  C22C1/10 ,  B33Y10/00 ,  B33Y70/10 ,  B33Y40/10

Abstract: A process for manufacturing a multi-material part by additive manufacturing, includes the following steps: a) a step of providing a pre-treated metal powder comprising grains and an oxidized and porous layer on a surface of the grains; b) a selective laser powder-bed fusion step comprising implementation of steps i) and ii) as follows: i) a step of forming a layer from the pre-treated metal powder; ii) a step of melting by laser the layer, the melting step being carried out under a reactive atmosphere and comprising changing parameters of application of the laser so that at least a first region of the layer is converted so as to lower the electrical conductivity thereof, thus forming a dielectric, and so that at least a second region of the layer is densified without converting it, the at least a first region being formed when the parameters of application of the laser allow a first energy density to be applied to the first region and/or the laser beam to be kept for a first dwell time on the first region, the at least a second region being formed when the parameters of application of the laser allow a second energy density to be applied to the second region and/or the laser beam to be kept for a second dwell time on the second region, and the first energy density being higher than the second energy density and/or the first dwell time being longer than the second dwell time. A part obtained using the process is also provided.

公开(公告)号：US11577860B2

公开(公告)日：2023-02-14

申请号：US16570277

申请日：2019-09-13

Applicant: CENTRE NATIONAL D'ETUDES SPATIALES

Inventor： Luc-Olivier Gonidou

IPC: B64G1/38 ,  B64G1/60 ,  B64G1/64 ,  G06F17/16

Abstract: A method for determining, by reanalysis, a vibratory environment of a coupled vehicle/passenger system. A vehicle is subjected to external forces Fext and is coupled to a new passenger including multiple payloads (e.g., x=I, . . . N payload(s)). At the level of vehicle/passenger interfaces Ix, the method comprising a step DET1) for determining, based on reference interfacial acceleration γx_ref of a reference passenger, the interfacial acceleration γx′ relative to the new passenger.

公开(公告)号：US20220348361A1

公开(公告)日：2022-11-03

申请号：US17762303

申请日：2020-09-22

Applicant: CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE ,  CENTRE NATIONAL D'ETUDES SPATIALES ,  UNIVERSITE PARIS-SACLAY

Inventor： Jacques GIERAK ,  Claude BONIFACE ,  Mathieu LEPESANT

IPC: B64G1/40 ,  H01J27/26

Abstract: An ion propulsion device including emission modules in an emission plane, each module having an insulating support, an emission electrode on the support, and a conductive liquid with a microfluidic channel depositing conductive liquid on the electrode; an extraction electrode common to the emission modules and facing the modules; and a control unit, in which each module is configured to emit an ion beam when an electric field is applied to the liquid; each control unit controls an ion emission current emitted by applying a potential difference between each emission electrode and the extraction electrode; the emission electrodes are spaced apart by a linear distance that is greater than a distance between two adjacent emission electrodes separated by an empty space; and a length of the insulating support between the electrodes is greater than a propagation distance of an electric leakage current by charge jumping along the support between the electrodes.

公开(公告)号：US11294065B2

公开(公告)日：2022-04-05

申请号：US16090844

申请日：2017-04-10

Applicant: CENTRE NATIONAL D'ETUDES SPATIALES

Inventor： François-Xavier Marmet

IPC: G01S19/11 ,  G01S1/02 ,  G01S5/16 ,  G01S1/70 ,  G01C21/20

Abstract: A navigation system using Visible Light Communications (VLC), the associated transmitters and receivers, the navigation system comprising a plurality of VLC transmitters (201 to 207) and one or more GNSS receiver (430), each of the VLC transmitters being configured to transmit a positioning signal comprising a navigation message including time information, where the time information is a transmission time of a specific part of said navigation message derived from a GNSS reference time. The receivers (221) according to the invention are configured to calculate a position from either VLC pseudo ranges, GNSS pseudo ranges, or a combination thereof.
The associated methods for transmitting positioning signals in a navigation system according to the invention, and for determining a position from a plurality of positioning signals transmitted by said navigation system.

公开(公告)号：US20210368552A1

公开(公告)日：2021-11-25

申请号：US17052183

申请日：2019-05-02

Applicant: THALES ,  CENTRE NATIONAL D'ETUDES SPATIALES ,  INSTITUT SUPERIEUR DE L'AERONAUTIQUE ET DE L'ESPACE ,  INSTITUT NATIONAL POLYTECHNIQUE DE TOULOUSE ,  CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE

Inventor： Selma ZAMOUM ,  Mathieu GINESTE ,  Jérôme LACAN ,  Marie-Laure BOUCHERET ,  Jean-Baptiste DUPE

IPC: H04W74/08 ,  H04B7/185

Abstract: A method for transmitting data packets through a random-access (RA) transmission channel shared by a plurality of user terminals uses and exploits a function F for assigning and distributing transmission resources F(u) to the user terminals, knowledge of the graph of which is shared by the sending user terminals and the receiving station in a preliminary step. During the decoding of the received packets, the graph {(u, F(u)} of the assigning and distributing function is exploited by the receiving station to minimize, or even to decrease to zero, the number of replica-location correlations required in case of failure of the conventional CRD-SA protocol decoding process.

公开(公告)号：US11086054B2

公开(公告)日：2021-08-10

申请号：US16320142

申请日：2017-07-26

Applicant: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES ,  CENTRE NATIONAL D'ETUDES SPATIALES

Inventor： Corinne Marcel ,  Frederic Sabary ,  Xavier Verdalet Guardiola ,  Stephanie Remaury

IPC: B32B15/04 ,  B32B17/06 ,  G02B5/08 ,  B64G1/22 ,  C03C17/36 ,  B64G1/58 ,  C09K9/00 ,  G02B7/00

Abstract: A solid-state thermochromic device and method for producing the device, the device including: a stack successively including, from a rear face to a front face exposed to solar radiation: a) a solid substrate of an inorganic material resistant up to a temperature of 550° C.; b) an infrared-reflective layer of an electronically conductive material; c) electronically insulating interface layers; d) an electronically insulating inorganic dielectric layer transparent to infrared radiation, of cerium oxide CeO2, with a thickness between 400 and 900 nm; e) electronically insulating interface layers; f) a layer of an infrared-active thermochromic material, an n-doped VO2 vanadium oxide, and crystallized in a monoclinic or rutile phase, with a thickness between 30 and 50 nm; and g) a solar-protective coating, transparent to infrared radiation.

公开(公告)号：US11081607B2

公开(公告)日：2021-08-03

申请号：US15996847

申请日：2018-06-04

Applicant: CENTRE NATIONAL D'ETUDES SPATIALES ,  OFFICE NATIONAL D'ETUDES ET DE RECHERCHES AÉROSPATIALES

Inventor： Denis Payan ,  Virginie Inguimbert ,  Jean-Michel Siguier

IPC: H01L31/0224 ,  B64G1/44 ,  H01L31/048 ,  H01L31/05 ,  H02S99/00 ,  H01L31/054 ,  H01L31/042 ,  H01L31/0445

Abstract: This solar panel includes a structure in contact with an ambient environment and at least two photovoltaic cells each defining a lateral contact face and including a base element, a grid of electric conductors and a protective element made from transparent material, the grid including at least one conductive wire extending along the lateral contact face. The two cells are arranged on the structure such that at least part of each of the lateral contact faces is arranged regarding the other part while forming a panel surface and such that the shortest path passing through the ambient environment between the opposite parts of the lateral faces of the two cells is equal to at least about 20 mm.