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1. 发明专利

FR3080920A1 PROCÉDÉS D'ANALYSE ET DE CORRÉLATION SPECTRALE LARGE BANDE SANS CALCUL 未知
公开(公告)号：FR3080920A1
公开(公告)日：2019-11-08
申请号：FR1904624
申请日：2019-05-02
申请人： RAM PHOTONICS LLC
发明人： VAHID ATAIE
IPC分类号： G01R23/165 , H04B1/06
摘要： Un dispositif de génération d'un ensemble de coefficients de corrélation spectrale d'un signal d'entrée inclut : un laser maître configuré pour générer un signal de peigne de fréquences optiques ; un premier modulateur optique configuré pour moduler le signal de peigne de fréquences optiques avec un signal d'entrée pour générer une pluralité de copies spectrales du signal d'entrée ; un élément dispersif configuré pour retarder la pluralité de copies spectrales du signal d'entrée d'un retard dépendant de la longueur d'onde ; un deuxième modulateur optique configuré pour moduler la pluralité retardée de copies spectrales avec un conjugué du signal d'entrée ; et un filtre en peigne optique configuré pour intégrer la pluralité modulée par conjugué de copies spectrales du signal d'entrée pour générer un ensemble de coefficients d'autocorrélation cyclique. Figure à publier avec l’abrégé : figure 2

2. 发明专利

GB2570213A Method and system for spread spectrum code acquisition 未知
公开(公告)号：GB2570213A
公开(公告)日：2019-07-17
申请号：GB201819562
申请日：2018-11-30
申请人： RAM PHOTONICS LLC
发明人： VAHID ATAIE , STOJAN RADIC
IPC分类号： H04B1/7075 , H04B1/7073
摘要： A direct sequence spread spectrum (DSSS) signal (300, Fig. 3) is prepended with a preamble (310, Fig. 3). The preamble is generated in a DSSS transmitter by first generating a preamble-codeword in a frequency domain and then transforming the preamble-codeword into the time domain. The preamble codeword comprises a plurality of non-uniformly distributed frequencies. In one embodiment a code acquisition module 520 for a DSSS receiver includes a Sparse Discrete Fourier transform (SDFT) module 522 configured to perform an SDFT on a preamble of a received DSSS frame 510 to calculate Fourier coefficients 523 for the plurality of distributed frequencies. The Fourier coefficients are multiplied 524 by the complex conjugates of reference Fourier coefficients 525 of a reference preamble-codeword which corresponds to the preamble-codeword used by the transmitter. The multiplier output can be regarded as time-domain cross-correlation signal 527. A delay estimation 528 for the received DSSS frame is generated from the cross-correlation signal. In an alternative embodiment (Fig. 7) the code acquisition module uses optical frequency combs 710, 720, a wavelength demultiplexer, 750, and a plurality of balanced detectors 760.

3. 发明专利

DE102018130696A1 Verfahren und System zur Frequenzspreizcodeerfassung 未知
公开(公告)号：DE102018130696A1
公开(公告)日：2019-06-06
申请号：DE102018130696
申请日：2018-12-03
申请人： RAM PHOTONICS LLC
发明人： ATAIE VAHID
IPC分类号： H04B1/7073
摘要： Ein Codeerfassungsmodul für einen Direct-Sequence-Spread-Spectrum-Empfänger (DSSS-Empfänger) umfasst: ein Sparse-Discrete-Fourier-Transform-Modul (SDFT-Modul), das ausgebildet ist, eine SDFT an einer endlichen Anzahl ungleichmäßig verteilter Frequenzen durchzuführen, die eine Präambel eines empfangenen DSSS-Rahmens umfassen, um Fourier-Koeffizienten für die endliche Anzahl ungleichmäßig verteilter Frequenzen zu berechnen, einen Multiplizierer, der ausgebildet ist, die Fourier-Koeffizienten für die endliche Anzahl ungleichmäßig verteilter Frequenzen des empfangenen DSSS-Rahmens mit konjugiert komplexen Fourier-Koeffizienten für die endliche Anzahl ungleichmäßig verteilter Frequenzen zu multiplizieren, um eine Kreuzkorrelation des empfangenen DSSS-Rahmens und der konjugiert komplexen Fourier-Koeffizienten zu erzeugen, und ein Filtermodul, das zur Eingabe der Kreuzkorrelation und zur Ausgabe einer Verzögerungsabschätzung für den empfangenen DSSS-Rahmen ausgebildet ist.

4. 发明专利

DE102016012185A1 Verfahren und System zum Charakterisieren optischer Wellenfronten 未知
公开(公告)号：DE102016012185A1
公开(公告)日：2017-04-13
申请号：DE102016012185
申请日：2016-10-12
申请人： RAM PHOTONICS LLC
发明人： BAHK SEUNG-WHAN
IPC分类号： G01B9/02 , G01B9/021
摘要： Ein Verfahren zur Messung von Charakteristiken der Wellenfront eines einfallenden Strahls umfasst das Erhalten eines dem einfallenden, durch eine Transmissionsmaske mit einer Anti-Reflexionsbeschichtung tretenden Strahl zugeordneten Interferogramms und Fourier-Transformieren des Interferogramms, um ein Frequenzdomänen-Interferogramm bereitzustellen. Das Verfahren umfasst auch das Auswählen einer Teilmenge von Harmonischen aus dem Frequenzdomänen-Interferogramm, individuell invers Fourier-Transformieren jeder der Harmonischen der Teilmenge, um eine Menge von Raumdomänen-Harmonischen bereitzustellen, und Extrahieren eines Phasenprofils aus jeder Raumdomänen-Harmonischen der Menge. Das Verfahren umfasst ferner das Beseitigen von Phasen-Diskontinuitäten in dem Phasenprofil, Rotieren des Phasenprofils, und Rekonstruieren der Phasenfront der Wellenfront des einfallenden Strahls.

5. 发明专利

GB2570213B Method and system for spread spectrum code acquisition 未知
公开(公告)号：GB2570213B
公开(公告)日：2022-07-13
申请号：GB201819562
申请日：2018-11-30
申请人： RAM PHOTONICS LLC
发明人： VAHID ATAIE
IPC分类号： H04B1/7075 , H04B1/7073
摘要： A code acquisition module for a direct sequence spread spectrum (DSSS) receiver includes: a Sparse Discrete Fourier transform (SDFT) module configured to perform an SDFT on a finite number of non-uniformly distributed frequencies comprising a preamble of a received DSSS frame to calculate Fourier coefficients for the finite number of non-uniformly distributed frequencies; a multiplier configured to multiply the Fourier coefficients for the finite number of non-uniformly distributed frequencies of the received DSSS frame by complex conjugate Fourier coefficients for the finite number of non-uniformly distributed frequencies to generate a cross-correlation of the received DSSS frame and the complex conjugate Fourier coefficients; and a filter module configured to input the cross-correlation and output a delay estimation for the received DSSS frame.

6. 发明专利

GB2570213A8 Method and system for spread spectrum code acquisition 未知
公开(公告)号：GB2570213A8
公开(公告)日：2020-02-12
申请号：GB201819562
申请日：2018-11-30
申请人： RAM PHOTONICS LLC
发明人： VAHID ATAIE
IPC分类号： H04B1/7075 , H04B1/7073
摘要： A direct sequence spread spectrum (DSSS) signal (300, Fig. 3) is prepended with a preamble (310, Fig. 3). The preamble is generated in a DSSS transmitter by first generating a preamble-codeword in a frequency domain and then transforming the preamble-codeword into the time domain. The preamble codeword comprises a plurality of non-uniformly distributed frequencies. In one embodiment a code acquisition module 520 for a DSSS receiver includes a Sparse Discrete Fourier transform (SDFT) module 522 configured to perform an SDFT on a preamble of a received DSSS frame 510 to calculate Fourier coefficients 523 for the plurality of distributed frequencies. The Fourier coefficients are multiplied 524 by the complex conjugates of reference Fourier coefficients 525 of a reference preamble-codeword which corresponds to the preamble-codeword used by the transmitter. The multiplier output can be regarded as time-domain cross-correlation signal 527. A delay estimation 528 for the received DSSS frame is generated from the cross-correlation signal. In an alternative embodiment (Fig. 7) the code acquisition module uses optical frequency combs 710, 720, a wavelength demultiplexer, 750, and a plurality of balanced detectors 760.

7. 发明专利

GB201819562D0 Method and system for spread spectrum code acquisition 未知
公开(公告)号：GB201819562D0
公开(公告)日：2019-01-16
申请号：GB201819562
申请日：2018-11-30
申请人： RAM PHOTONICS LLC
摘要： A code acquisition module for a direct sequence spread spectrum (DSSS) receiver includes: a Sparse Discrete Fourier transform (SDFT) module configured to perform an SDFT on a finite number of non-uniformly distributed frequencies comprising a preamble of a received DSSS frame to calculate Fourier coefficients for the finite number of non-uniformly distributed frequencies; a multiplier configured to multiply the Fourier coefficients for the finite number of non-uniformly distributed frequencies of the received DSSS frame by complex conjugate Fourier coefficients for the finite number of non-uniformly distributed frequencies to generate a cross-correlation of the received DSSS frame and the complex conjugate Fourier coefficients; and a filter module configured to input the cross-correlation and output a delay estimation for the received DSSS frame.

8. 发明专利

FR3080920B1 PROCÉDÉS D'ANALYSE ET DE CORRÉLATION SPECTRALE LARGE BANDE SANS CALCUL 未知
公开(公告)号：FR3080920B1
公开(公告)日：2021-06-18
申请号：FR1904624
申请日：2019-05-02
申请人： RAM PHOTONICS LLC
发明人： VAHID ATAIE
IPC分类号： G01R23/165 , H04B1/06
摘要： Un dispositif de génération d'un ensemble de coefficients de corrélation spectrale d'un signal d'entrée inclut : un laser maître configuré pour générer un signal de peigne de fréquences optiques ; un premier modulateur optique configuré pour moduler le signal de peigne de fréquences optiques avec un signal d'entrée pour générer une pluralité de copies spectrales du signal d'entrée ; un élément dispersif configuré pour retarder la pluralité de copies spectrales du signal d'entrée d'un retard dépendant de la longueur d'onde ; un deuxième modulateur optique configuré pour moduler la pluralité retardée de copies spectrales avec un conjugué du signal d'entrée ; et un filtre en peigne optique configuré pour intégrer la pluralité modulée par conjugué de copies spectrales du signal d'entrée pour générer un ensemble de coefficients d'autocorrélation cyclique. Figure à publier avec l’abrégé : figure 2

9. 发明专利

GB2574933B Methods for computation-free wideband spectral correlation and analysis 未知
公开(公告)号：GB2574933B
公开(公告)日：2020-08-12
申请号：GB201906240
申请日：2019-05-03
申请人： RAM PHOTONICS LLC
发明人： VAHID ATAIE
IPC分类号： G06E3/00
摘要： An apparatus for generating a set of spectral correlation coefficients of an input signal includes: a master laser configured to generate an optical frequency comb signal; a first optical modulator configured to modulate the optical frequency comb signal with an input signal to generate a plurality of spectral copies of the input signal; a dispersive element configured to delay the plurality of spectral copies of the input signal by a wavelength-dependent time delay; a second optical modulator configured to modulate the delayed plurality of spectral copies with a conjugate of the input signal; and an optical comb filter configured to integrate the conjugate modulated plurality of spectral copies of the input signal to generate a set of cyclic autocorrelation coefficients.

10. 发明专利

GB2574933A Methods for computation-free wideband special correlation and analysis 未知
公开(公告)号：GB2574933A
公开(公告)日：2019-12-25
申请号：GB201906240
申请日：2019-05-03
申请人： RAM PHOTONICS LLC
发明人： VAHID ATAIE
IPC分类号： G06E3/00
摘要： Optically generating Wigner function coefficients uses a master laser 210 to produce an optical frequency comb signal 220. The frequency comb is optically modulated 230 with a first signal 225 to generate spectral copies 235 of the first signal on the frequency comb. A dispersive element 240 delays the spectral copies by a wavelength-dependent delay. The delayed spectral copies are modulated 250 with a second signal 227 and integrated by an optical comb filter 260 to generate the set of Wigner function coefficients. The optical modulators may be amplitude modulators. The second signal may be a conjugate of the first signal, and the Wigner function may be a cyclic autocorrelation function. Alternatively, the second signal may be a conjugate of a signal other than the first signal and the Wigner function may be a cross-ambiguity function. A wavelength demultiplexer may combine the comb filter’s output with a swept sampling signal so that each swept sampling signal samples a corresponding integrated modulated delayed spectral copy of the first signal. Detectors may output the Wigner function coefficients for all time delays of an associated tone from the integrated modulated delayed spectral copies of the first signal.

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