公开(公告)号：US11372074B2

公开(公告)日：2022-06-28

申请号：US16962185

申请日：2019-01-21

Applicant: CENTRE NATIONAL D'ETUDES SPATIALES

Inventor： Nicolas Capet ,  François-Xavier Marmet

IPC: G01S5/00 ,  G01S5/02 ,  G01S5/08 ,  G01S5/10 ,  G01S5/12 ,  G01S5/14 ,  G01S5/16

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.

公开(公告)号：US11313975B2

公开(公告)日：2022-04-26

申请号：US16762924

申请日：2018-11-14

Applicant: CENTRE NATIONAL D'ETUDES SPATIALES

Inventor： Nicolas Capet ,  François-Xavier Marmet

IPC: G01S19/22 ,  G01S19/36

Abstract: An add-on device configured to reduce the power level of reflected paths of GNSS signals reaching a GNSS receiver's antenna, the associated GNSS receiver set, some equipment embedding the add-on device, and the associated method to reduce the power level of reflected GNSS signals are provided. The GNSS signals are transmitted according to a first polarization, and the add-on device comprises a material configured to be transparent to the first polarization and to reflect GNSS signals polarized according to a second polarization orthogonal to the first polarization.

公开(公告)号：US10605927B2

公开(公告)日：2020-03-31

申请号：US15936704

申请日：2018-03-27

Applicant: CENTRE NATIONAL D'ETUDES SPATIALES

Inventor： François-Xavier Marmet ,  Nicolas Capet

IPC: G01C15/00 ,  G01S19/10 ,  G01S19/46 ,  G05D1/02 ,  G01S5/10 ,  H04W4/00 ,  G01S19/14 ,  G05D1/10 ,  G01S19/11 ,  G01S1/00 ,  B64C39/02 ,  H04W4/02 ,  G01S1/70 ,  H04W4/40 ,  G01S1/68

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.

公开(公告)号：US11543536B2

公开(公告)日：2023-01-03

申请号：US16958688

申请日：2018-12-14

Applicant: CENTRE NATIONAL D'ETUDES SPATIALES

Inventor： Nicolas Capet ,  François-Xavier Marmet

IPC: H01Q3/34 ,  G01S19/11 ,  G01S1/04 ,  H01Q21/08 ,  H01Q25/04

Abstract: An antenna assembly configured to transmit terrestrial positioning signals from a relay platform having a frame of reference, the transmit being in at least a first mode with a radiating pattern having at least a main lobe having a narrow aperture in a plane and a wide aperture in a plane. A relay platform comprising a receiver of a synchronization signal, a transmitter of positioning signals to an area of service comprising a number of rovers, and an antenna assembly configured to produce a radiating pattern adapted to transmit the positioning signals as a function of the environment of the relay platform and the rovers. In a number of embodiments the relay platforms may be organized in a network of platforms, possibly of masters and slaves that receive feed-back from the rovers in the AoS so as to optimize the configuration of the antenna elements dynamically to optimize the QoS of positioning based on a number of selected quality indexes.

公开(公告)号：US10126341B2

公开(公告)日：2018-11-13

申请号：US14833731

申请日：2015-08-24

Applicant: CENTRE NATIONAL D'ETUDES SPATIALES C N E S

Inventor： Jacques Sombrin ,  Isabelle Albert ,  Geoffroy Soubercaze-Pun ,  Nicolas Capet

IPC: G01R29/10 ,  H01Q19/13 ,  H01Q19/19

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).

公开(公告)号：US10943483B2

公开(公告)日：2021-03-09

申请号：US15788924

申请日：2017-10-20

Applicant: CENTRE NATIONAL D'ETUDES SPATIALES

Inventor： François-Xavier Marmet ,  Lionel Ries ,  Nicolas Capet

IPC: G08G1/16 ,  G01C21/30 ,  G01S19/51 ,  H04W4/44 ,  H04W4/024 ,  H04W4/46 ,  H04W4/02 ,  G01S19/48 ,  G01S5/02 ,  G01S5/00 ,  G08G1/0967 ,  H04L29/08

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.

公开(公告)号：US10732291B2

公开(公告)日：2020-08-04

申请号：US15846452

申请日：2017-12-19

Applicant: CENTRE NATIONAL D'ETUDES SPATIALES

Inventor： Nicolas Capet ,  François-Xavier Marmet

IPC: G01S19/22 ,  G01S19/36

Abstract: A GNSS receiver, and an associated method are presented for calculating a position from positioning signals transmitted by a plurality of GNSS transmitters. For example the receiver compsises a first and a second signal acquisition elements having different polarizations, the receiver being configured to process the signals received on the first signal acquisition element to calculate first pseudo range measurements, and the signals received on the second signal acquisition element to calculate second pseudo range measurements and associated quality indicators. The receiver further comprises a calculation circuit 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.

公开(公告)号：US10656283B2

公开(公告)日：2020-05-19

申请号：US15596676

申请日：2017-05-16

Applicant: CENTRE NATIONAL D'ETUDES SPATIALES

Inventor： Nicolas Capet ,  François-Xavier Marmet

IPC: G01S19/22 ,  G01S19/26 ,  G01S19/36 ,  H01Q3/36 ,  G01S17/86 ,  G01S13/86 ,  H04N5/232 ,  H04N5/33

Abstract: The invention discloses an antenna assembly comprising one or more sensors, possibly a fish-eye camera which produces images of the sky above the antenna, said images being processed to identify open sky and occulted sky areas, said identification being used to generate an antenna gain pattern shape wherein null zones are placed on the occulted sky areas, so as to eliminate the GNSS signals which are affected by multipath reflection. The antenna assembly of the invention may be used with any GNSS receiver of the prior art. No specific data on the location of the receiver or its orientation is needed to perform the method of the invention, while in some embodiments, it may be useful to send some information on the number of satellites in view in the open sky.