Centre National Detudes Spatiales

Le Centre National De La Recherche Scientifique

L'universite De Rennes 1

Anywaves

Clix Industries

Centre National De La Recherche Scientifique

Universite Rennes 1

Nicolas Capet

François-Xavier Marmet

Lionel Ries

Ronan Sauleau

Mauro Ettorre

Jacques Sombrin

Geoffroy Soubercaze-Pun

Isabelle Albert

Francesco Foglia Manzillo

Karim Tekkouk

Richard Boudinot

The invention relates to a foldable/deployable structure () comprising: —a mast () which can be deployed along a longitudinal deployment axis, the mast being designed to be placed either in a folded state requiring little axial installation space, or in a deployed state having a predetermined shape, —a base () upon which the deployable mast () is rested, the structure () further comprising a bracing device, the bracing device: —having at least three points for attachment to the base () and at least three points for attachment to the mast (), the bracing device connecting the base to the mast; —being designed to limit the transverse movements of the mast relative to the base () at least when the mast () is in a deployed state, and; —comprising at least one connecting member () chosen from the group formed by fabrics, non-woven fabrics and ties, the ties being chosen from the group formed by monofilaments, cables, bundles and strips; the structure () being characterised in that it comprises a device () for tensioning each connecting member of the bracing device when the mast () is in the deployed state, the tensioning device () enabling a proximal end of the mast () to be maintained in the deployed state, at a distance from the base () greater than the distance separating the proximal end of the mast () from the base () when the mast is in the folded state.

Foldable/deployable structure comprising a deployable mast

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.

Relay platform for transmitting positioning signals to rovers with an optimized radiation pattern

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.

Positioning system

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.

GNSS antenna add-on

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.

Collaborative improvement of a vehicle's positioning

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.

Multilayer waveguide comprising at least one transition device between layers of this multilayer waveguide

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.

Multipath mitigation in a GNSS radio receiver

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.

Adaptative antenna assembly for improving precision of a GNSS receiver in a perturbated environment

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.

Relay vehicle for transmitting positioning signals to rovers with an optimized dilution of precision

A process and a device for measuring intermodulation products by wave reflection on a non-linear object (), including two electromagnetic sources () of distinct focal points emitting fundamental components, and a receiver (), the process includes a step in which the measuring device is in a configuration so that the receiver () produces a signal for a first composition of the enriched wave (), and a second step in which the measuring device is in a second configuration so that the receiver () produces a measuring signal for a second composition of the enriched wave ().

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Toulouse, France

Nicolas Capet