公开(公告)号：US20190331796A1

公开(公告)日：2019-10-31

申请号：US16472890

申请日：2017-12-28

Applicant: THALES

Inventor： Grégoire PILLET ,  Patrick FENEYROU

IPC: G01S17/32 ,  G01S7/481 ,  G01S7/491

Abstract: A method for processing a signal from a coherent lidar includes a coherent source, the method comprising steps consisting of: generating a first beat signal and a second beat signal, using respectively a first detection assembly and a second detection assembly for a plurality of n time intervals, determining n respective values of spectral density using a transform in the frequency domain of the cross-correlation between the first and second beat signals, determining a mean value of the spectral density using said n values of spectral density, determining a piece of location information on the target using the mean value of said spectral density.

公开(公告)号：US20220085515A1

公开(公告)日：2022-03-17

申请号：US17418237

申请日：2019-12-18

Applicant: THALES

Inventor： Adrien GLISE ,  Isabelle LE ROY-NANEIX ,  Stefan VARAULT ,  Grégoire PILLET ,  Christian RENARD

IPC: H01Q15/14 ,  H01Q1/52 ,  H01Q19/02 ,  H01Q17/00 ,  H01Q15/00

Abstract: An array antenna (A) in a medium (M) comprises a plurality of radiating elements (ERT) ensuring the transition between the antenna and the medium, the reflectivity of each element depending on a parameter, the reflectivity of a first element being close to that of the medium, the reflectivity of a last element being close to that of the antenna, the reflectivity parameter of the elements varying from one element to the next. A method comprises calculation of a path equal to the sum of the variations of the reflectivity from one element to the next element, optimization of the variation of the reflectivity parameter so that equivalent radar cross-section of the antenna is the lowest possible or the antenna best observes the radiation objectives, determination of the different elements as a function of said parameter, and simulation of the overall reflectivity and/or of the radiation of the antenna.

公开(公告)号：US20240014564A1

公开(公告)日：2024-01-11

申请号：US18348090

申请日：2023-07-06

Applicant: THALES ,  UNIVERSITÉ DE BORDEAUX ,  INSTITUT POLYTECHNIQUE DE BORDEAUX ,  Centre national de la recherche scientifique

Inventor： Timothée LE GALL ,  Anthony GHIOTTO ,  Gwenaël MORVAN ,  Stefan VARAULT ,  Bruno LOUIS ,  Grégoire PILLET

IPC: H01Q9/04 ,  H01Q1/48 ,  H01Q21/24

CPC classification number: H01Q9/045 ,  H01Q1/48 ,  H01Q21/24

Abstract: The elementary antenna 1 includes: two cross-shaped slots 32, 33 defining four half-slots; for each half-slot, excitation striplines 41, 42, the first stripline 41 being connected to a first via 61 and the second stripline 42 being connected to a second via 62; an integrated circuit 70 delivering a plurality of ports; for each half-slot, tracks for feeding the strips, the first track 51 running from a first port 71 to the first via 61 and the second track 52 running from a second port 72 to the second via 62, the first and second ports being two successive ports of the integrated circuit, differentially connected to a transmitter/receiver channel by first and second power lines situated inside the integrated circuit, the lines and tracks running so that there is no crossing of the respective routes thereof.

公开(公告)号：US20190204441A1

公开(公告)日：2019-07-04

申请号：US16325705

申请日：2017-08-21

Applicant: THALES

Inventor： Patrick FENEYROU ,  Grégoire PILLET

IPC: G01S17/32 ,  G01S17/58 ,  G01S7/491 ,  G01S7/493

CPC classification number: G01S17/325 ,  G01S7/4818 ,  G01S7/4917 ,  G01S7/493 ,  G01S17/58

Abstract: A method for processing a signal arising from coherent lidar includes a coherent source that is periodically frequency-modulated; a beat signal being generated by photodetector on the basis of the interference between an optical signal that is referred to as the local oscillator having a local oscillator frequency (fOL(t)) and an optical signal that is backscattered by a target illuminated by the lidar, said beat signal being digitized; the local oscillator frequency (fOL(t)) being made up of the sum of a mean value (f0) and of a modulation frequency (fmod(t)) arising from the modulation of the source, the modulation frequency being periodic according to a modulation period (TFO), each period comprising n linear portions having n frequency slopes (αi), respectively, where n is greater than or equal to 2, the method comprising the steps consisting in: complexly modulating the beat signal; complexly demodulating the modulated signal (Smod) by n demodulation frequencies (fdemod(i)) each having a single slope that is equal to the respective frequency slope (αi) of the modulation frequency (fmod), in order to obtain n demodulated signals (Sdemod(i)); determining n spectral densities (SP(i)) of the n demodulated signals (SdemodO)); determining n characteristic frequencies (ναi) determining information on the velocity and information on the distance of the target on the basis of said n characteristic frequencies (ναi).

公开(公告)号：US20180073932A1

公开(公告)日：2018-03-15

申请号：US15561057

申请日：2016-03-16

Applicant: THALES

Inventor： Jean MINET ,  Grégoire PILLET ,  Patrick FENEYROU

IPC: G01J9/04 ,  G01S7/497

CPC classification number: G01J9/04 ,  G01S7/4911 ,  G01S7/497 ,  G01S17/325 ,  H01S5/0014 ,  H01S5/0622

Abstract: A method for reducing the peak factor of a signal transmitted in a frequency band comprising several channels, the signal using a plurality of channels in the band comprises: a step of clipping the signal, a step of subtracting the clipped signal from the signal, so as to obtain a peak signal, a step of filtering the peak signal with the aid of a multichannel filter configured to comply with a predetermined spectral mask for each of the channels used by the signal, and a step of subtracting the filtered peak signal from the signal. A device for emitting a multichannel signal implementing the method for reducing the peak factor is also provided.

公开(公告)号：US20150308811A1

公开(公告)日：2015-10-29

申请号：US14698658

申请日：2015-04-28

Applicant: THALES

Inventor： Patrick FENEYROU ,  Grégoire PILLET ,  Jean MINET

IPC: G01B9/02 ,  G01S13/86 ,  G01S17/06

CPC classification number: G01B9/02083 ,  G01S7/4915 ,  G01S13/343 ,  G01S17/325 ,  G01S17/36

Abstract: A method for generating M demodulation signals is disclosed. In one aspect, the method includes: providing M input signals, injecting each input signal into at least one first interferometer, and detecting M demodulation signals. The method also includes choosing M positive integers that are not all equal to zero and computing M demodulation signals. The ith demodulation signal being the product of Ri+1 functions, Ri being the chosen integer that corresponds to the first delay of the ith first interferometer, and the pth function being equal to Si,p(t)=S(t−pτi), where p is an integer between 0 and Ri, τi is the first delay introduced by the delay line of the ith first interferometer, and S is a transform of the signal at the output of the ith first interferometer.

Abstract translation: 公开了一种用于产生M个解调信号的方法。 一方面，该方法包括：提供M个输入信号，将每个输入信号注入到至少一个第一干涉仪中，以及检测M个解调信号。 该方法还包括选择不等于零并且计算M个解调信号的M个正整数。 第i个解调信号是Ri + 1函数的乘积，Ri是对应于第i个第一干涉仪的第一个延迟的选择整数，第p个函数等于Si，p（t）= S（t-pτi） 其中p是0和Ri之间的整数，τi是由第i个第一干涉仪的延迟线引入的第一延迟，S是第i个第一干涉仪的输出处的信号的变换。