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：US20240004043A1

公开(公告)日：2024-01-04

申请号：US18267762

申请日：2021-12-10

Applicant: THALES

Inventor： Patrick FENEYROU ,  Jérôme BOURDERIONNET ,  Daniel DOLFI

IPC: G01S7/4912 ,  G01S17/34 ,  G01S17/58 ,  G01S7/481

CPC classification number: G01S7/4917 ,  G01S17/34 ,  G01S17/58 ,  G01S7/4811

Abstract: A method for processing a signal from a coherent lidar comprising a periodically frequency-modulated coherent source (L), the method includes the following steps: A decomposing each modulation period indexed j into a plurality of intervals indexed i, and determining, for each interval Iij, an elementary power spectral density DSP(i,j) of the beat signal over the interval, B determining an average power spectral density over j DSP(i), C determining a lower frequency bound of the average power density DSP(i) and an upper frequency bound, D determining a distance dk(i) and a velocity of the fluid vk(i) from the lower and upper bounds.

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。