公开(公告)号：US11125879B2

公开(公告)日：2021-09-21

申请号：US16325705

申请日：2017-08-21

Applicant: THALES

Inventor： Patrick Feneyrou ,  Grégoire Pillet

IPC: G01C3/08 ,  G01S17/34 ,  G01S17/58 ,  G01S7/493 ,  G01S7/4912 ,  G01S7/481

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：US09441949B2

公开(公告)日：2016-09-13

申请号：US14698658

申请日：2015-04-28

Applicant: THALES

Inventor： Patrick Feneyrou ,  Grégoire Pillet ,  Jean Minet

IPC: G01B9/02 ,  G01S17/32 ,  G01S7/491 ,  G01S17/36 ,  G01S13/34

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 St,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定整数，第p个函数等于St，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。

公开(公告)号：US10317288B2

公开(公告)日：2019-06-11

申请号：US15561057

申请日：2016-03-16

Applicant: THALES

Inventor： Jean Minet ,  Grégoire Pillet ,  Patrick Feneyrou

IPC: G01J9/04 ,  G01S7/497 ,  G01S17/32 ,  G01S7/491 ,  H01S5/00 ,  H01S5/062

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：US20150346328A1

公开(公告)日：2015-12-03

申请号：US14721950

申请日：2015-05-26

Applicant: THALES

Inventor： Philippe Rondeau ,  Nicolas Bastien ,  Patrick Feneyrou

IPC: G01S7/481 ,  G01S17/08

CPC classification number: G01S7/4814 ,  G01P5/26 ,  G01S7/481 ,  G01S17/08 ,  G01S17/95 ,  Y02A90/19

Abstract: The general field of the invention is that of optical lidars comprising an optical porthole and operating at a first wavelength. The optical porthole of the lidar according to the invention comprises a layer or a sheet made of an optical material. The lidar comprises means for illuminating said layer or said sheet at a second wavelength different from the first wavelength, said material being transparent at the first wavelength and absorbent at the second wavelength, said second wavelength being located in the visible spectrum.

Abstract translation: 本发明的一般领域是包括光学孔并且以第一波长工作的光学激光雷达。 根据本发明的激光雷达的光学孔眼包括由光学材料制成的层或片。 激光雷达包括用于以不同于第一波长的第二波长照亮所述层或所述片材的装置，所述材料在第一波长是透明的，在第二波长处是吸收剂，所述第二波长位于可见光谱中。

公开(公告)号：US09588220B2

公开(公告)日：2017-03-07

申请号：US14721950

申请日：2015-05-26

Applicant: THALES

Inventor： Philippe Rondeau ,  Nicolas Bastien ,  Patrick Feneyrou ,  Jean-Pierre Schlotterbeck

IPC: G01S7/481 ,  G01S17/08 ,  G01P5/26 ,  G01S17/95

CPC classification number: G01S7/4814 ,  G01P5/26 ,  G01S7/481 ,  G01S17/08 ,  G01S17/95 ,  Y02A90/19

Abstract: The general field of the invention is that of optical lidars comprising an optical porthole and operating at a first wavelength. The optical porthole of the lidar according to the invention comprises a layer or a sheet made of an optical material. The lidar comprises means for illuminating said layer or said sheet at a second wavelength different from the first wavelength, said material being transparent at the first wavelength and absorbent at the second wavelength, said second wavelength being located in the visible spectrum.

Abstract translation: 本发明的一般领域是包括光学孔并且以第一波长工作的光学激光雷达。 根据本发明的激光雷达的光学孔眼包括由光学材料制成的层或片。 激光雷达包括用于以不同于第一波长的第二波长照亮所述层或所述片材的装置，所述材料在第一波长是透明的，在第二波长处是吸收剂，所述第二波长位于可见光谱中。

公开(公告)号：US11243307B2

公开(公告)日：2022-02-08

申请号：US16472890

申请日：2017-12-28

Applicant: THALES

Inventor： Grégoire Pillet ,  Patrick Feneyrou

IPC: G01C3/08 ,  G01S17/34 ,  G01S7/481 ,  G01S7/4913 ,  G01S7/4915

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.