François Auger - Academia.edu (original) (raw)

Papers by François Auger

2023 31st European Signal Processing Conference (EUSIPCO)

HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific re... more HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

HAL (Le Centre pour la Communication Scientifique Directe), Jul 1, 2017

HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific re... more HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

HAL (Le Centre pour la Communication Scientifique Directe), Dec 31, 2015

HAL (Le Centre pour la Communication Scientifique Directe), May 16, 2022

Proceedings of SPIE, Jan 17, 2010

This paper presents a novel approach for the multi-oriented text line extraction from historical ... more This paper presents a novel approach for the multi-oriented text line extraction from historical handwritten Arabic documents. Because of the multi-orientation of lines and their dispersion in the page, we use an image paving allowing us to progressively and locally determine the lines. The paving is initialized with a small window and then its size is corrected by extension until enough lines and connected components were found. We use the Snake for line extraction. Once the paving is established, the orientation is determined using the Wigner-Ville distribution on the histogram projection profile. This local orientation is then enlarged to limit the orientation in the neighborhood. Afterwards, the text lines are extracted locally in each zone basing on the follow-up of the baselines and the proximity of connected components. Finally, the connected components that overlap and touch in adjacent lines are separated. The morphology analysis of the terminal letters of Arabic words is here considered. The proposed approach has been experimented on 100 documents reaching an accuracy of about 98.6%.

IEEE Transactions on Signal Processing, 2018

Singular Spectrum Analysis (SSA) is a signal decomposition technique that aims at expanding signa... more Singular Spectrum Analysis (SSA) is a signal decomposition technique that aims at expanding signals into interpretable and physically meaningful components (e.g. sinusoids, noise, etc.). This article presents new theoretical and practical results about the separability of the SSA and introduces a new method called sliding SSA. First, the SSA is combined with an unsupervised classification algorithm to provide a fully automatic data-driven component extraction method for which we investigate the limitations for components separation in a theoretical study. Second, the detailed automatic SSA method is used to design an approach based on a sliding analysis window which provides better results than the classical SSA method when analyzing non-stationary signals with a time-varying number of components. Finally, the proposed sliding SSA method is compared to the Empirical Mode Decomposition (EMD) and to the synchrosqueezed Short-Time Fourier Transform (STFT), applied on both synthetic and real-world signals.

arXiv (Cornell University), Oct 11, 2022

The zeros of the spectrogram have proven to be a relevant feature to describe the time-frequency ... more The zeros of the spectrogram have proven to be a relevant feature to describe the time-frequency structure of a signal, originated by the destructive interference between components in the time-frequency plane. In this work, a classification of these zeros in three types is introduced, based on the nature of the components that interfere to produce them. Echoing noiseassisted methods, a classification algorithm is proposed based on the addition of independent noise realizations to build a 2D histogram describing the stability of zeros. Features extracted from this histogram are later used to classify the zeros using a non-supervised clusterization algorithm. A denoising approach based on the classification of the spectrogram zeros is also introduced. Examples of the classification of zeros are given for synthetic and real signals, as well as a performance comparison of the proposed denoising algorithm with another zero-based approach.

arXiv (Cornell University), Mar 30, 2021

In the last few years, Motor Current Signature Analysis (MCSA) has proven to be an effective meth... more In the last few years, Motor Current Signature Analysis (MCSA) has proven to be an effective method for electrical machines condition monitoring. Indeed, compared to vibration and temperature analysis, current measurement proves to be a convenient and non-invasive alternative. Moreover, it has proven to be a reliable method since many mechanical and electrical faults manifest as side-band spectral components generated around the fundamental frequency component of the motor's current. These components are called interharmonics and they are a major focus of fault detection using MCSA. However, the main drawback of this approach is that the interference of other more prevalent components such as the fundamental and noise components can obstruct the effect of interharmonics in the spectrum and may therefore affect fault detection accuracy. Thus, we propose in this paper an alternative approach that aims to decompose the different current components using a model based on a Vandermonde matrix, in order to monitor each component independently. Then, the tracking of each distinct component in time and spectral domains is implemented. This is achieved by estimating their respective relevant parameters using the Gradient Descent algorithm. This method has been favorably compared to an existing estimation algorithm (MUSIC) and its efficiency has been validated. The results of this work prove to be promising and establish the parametric tracking of the electrical current components using the Gradient Descent algorithm as a reliable monitoring approach.

arXiv (Cornell University), Mar 30, 2021

In the last few years, Motor Current Signature Analysis (MCSA) has proven to be an effective meth... more In the last few years, Motor Current Signature Analysis (MCSA) has proven to be an effective method for electrical machines condition monitoring. Indeed, compared to vibration and temperature analysis, current measurement proves to be a convenient and non-invasive alternative. Moreover, it has proven to be a reliable method since many mechanical and electrical faults manifest as side-band spectral components generated around the fundamental frequency component of the motor's current. These components are called interharmonics and they are a major focus of fault detection using MCSA. However, the main drawback of this approach is that the interference of other more prevalent components such as the fundamental and noise components can obstruct the effect of interharmonics in the spectrum and may therefore affect fault detection accuracy. Thus, we propose in this paper an alternative approach that aims to decompose the different current components using a model based on a Vandermonde matrix, in order to monitor each component independently. Then, the tracking of each distinct component in time and spectral domains is implemented. This is achieved by estimating their respective relevant parameters using the Gradient Descent algorithm. This method has been favorably compared to an existing estimation algorithm (MUSIC) and its efficiency has been validated. The results of this work prove to be promising and establish the parametric tracking of the electrical current components using the Gradient Descent algorithm as a reliable monitoring approach.

HAL (Le Centre pour la Communication Scientifique Directe), Jul 3, 2018

RESUME-L'un des plus grands défis de la production d'énergie éolienne est de lisser la fluctuatio... more RESUME-L'un des plus grands défis de la production d'énergie éolienne est de lisser la fluctuation de la puissance de sortie du générateur éolien dû à la variation aléatoire de la vitesse du vent. La fluctuation de la puissance éolienne se produit généralement sur une échelle de temps de quelques secondes à plusieurs heures. Ce travail traite de la fluctuation de la puissance éolienne sur des échelles de temps de l'ordre de la minute puisqu'elle est la plus souvent rencontrée et elle peut affecter la qualité de puissance du réseau électrique. Nous avons trouvé que le système de stockage d'énergie par supercondensateurs (SSES) est un moyen très utile pour compenser la puissance fluctuante puisqu'il est capable de contrôler les puissances active et réactive simultanément. Le vent est intermittent et aléatoire, donc une méthode appropriée a été choisie pour déterminer la puissance de référence du système de contrôle en minimisant le dimensionnement du système de stockage d'énergie requis.

RESUME-L'un des plus grands défis de la production d'énergie éolienne est de lisser la fluctuatio... more RESUME-L'un des plus grands défis de la production d'énergie éolienne est de lisser la fluctuation de la puissance de sortie du générateur éolien dû à la variation aléatoire de la vitesse du vent. La fluctuation de la puissance éolienne se produit généralement sur une échelle de temps de quelques secondes à plusieurs heures. Ce travail traite de la fluctuation de la puissance éolienne sur des échelles de temps de l'ordre de la minute puisqu'elle est la plus souvent rencontrée et elle peut affecter la qualité de puissance du réseau électrique. Nous avons trouvé que le système de stockage d'énergie par supercondensateurs (SSES) est un moyen très utile pour compenser la puissance fluctuante puisqu'il est capable de contrôler les puissances active et réactive simultanément. Le vent est intermittent et aléatoire, donc une méthode appropriée a été choisie pour déterminer la puissance de référence du système de contrôle en minimisant le dimensionnement du système de stockage d'énergie requis.

HAL (Le Centre pour la Communication Scientifique Directe), Jul 3, 2018

L'alimentation en électricité des sites isolés en mer tels que des îles ou des systèmes flottants... more L'alimentation en électricité des sites isolés en mer tels que des îles ou des systèmes flottants présente de nombreuses contraintes. Les sources d'énergie renouvelable les plus couramment utilisées sont les sources photovoltaïques et éoliennes. Cependant, leur intermittence et leur variabilité nécessitent l'utilisation de groupes électrogènes pour permettre la satisfaction de la demande. Avec le développement récent des énergies marines renouvelables, un système multi-sources intégrant des énergies marines est proposé dans cet article. Le potentiel énergétique des océans étant considérable, il s'avère en effet judicieux d'envisager l'exploitation des sources photovoltaïques, éoliennes, hydroliennes et houlomotrices pour alimenter des sites isolés en mer. Les ressources disponibles et les complémentarités potentielles pour l'île d'Ouessant sont d'abord présentées. Différentes configurations sont ensuite étudiées, permettant d'aboutir à un concept fiable en termes de satisfaction de la charge tout en considérant l'aspect économique.

2018 IEEE International Conference on Industrial Technology (ICIT), 2018

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific r... more HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. Multivariate abrupt change detectors Sarra Houidi, F. Auger, Houda Ben Attia Sethom, Laurence Miègeville, Dominique Fourer

Energies, 2020

Energy efficiency and low-carbon energy systems are increasingly taken into account in seaports, ... more Energy efficiency and low-carbon energy systems are increasingly taken into account in seaports, due to climate change challenges and the evolution of environmental regulations. Thus, technological breakthroughs must be brought to numerous systems in harbors, such as harbor cranes, seaport vehicles, or the power supply of berthed vessels. These aspects may require the establishment of a microgrid in the harbor area. Microgrids have been subjected to a wide development on the mainland and islands, mostly for domestic loads. However, these are still scarce in harbor areas. Their development in such places faces several challenges, such as high power requirements, monitoring and management of a wide range of loads, energy policy framework, etc. Moreover, the establishment of a microgrid involves a study of sizing and of energy management, to avoid prohibitive costs and to verify load requirements. This paper provides a literature survey related to the development of microgrids in seapo...

Zenodo (CERN European Organization for Nuclear Research), Jan 25, 2018

In this paper, we introduce the ASTRES * toolbox which offers a set of Matlab functions for non-s... more In this paper, we introduce the ASTRES * toolbox which offers a set of Matlab functions for non-stationary multicomponent signal processing. The main purposes of this proposal is to offer efficient tools for analysis, synthesis and transformation of any signal made of physically meaningful components (e.g. sinusoid, trend or noise). The proposed techniques contain some recent and new contributions, which are now unified and theoretically strengthened. They can provide efficient time-frequency or timescale representations and they allow elementary components extraction. Usage and description of each method are then detailed and numerically illustrated.

IEEE Signal Processing Letters, Oct 1, 1997

A geometrical description is given for reassignment vector fields of spectrograms. These vector f... more A geometrical description is given for reassignment vector fields of spectrograms. These vector fields are shown to be connected with both an intrinsic phase characterization and a scalar potential. This allows for the generalization of the original reassignment process to a differential version based on a dynamical evolution of time-frequency particles.

HAL (Le Centre pour la Communication Scientifique Directe), Aug 23, 2017

This paper introduces a new class of mother wavelet functions, based on a specific analysis windo... more This paper introduces a new class of mother wavelet functions, based on a specific analysis window which allows a recursive implementation of the Continuous Wavelet Transform (CWT). Using this new transform, we propose to compute a sharpened time-frequency representation by rewording the reassigned scalogram and the (first and second-order) synchrosqueezed CWT. We also propose an extension of the CWT reassignment operators, using the Levenberg-Marquardt algorithm, which can control the energy concentration of a reassigned scalogram through a damping parameter. Thus, our methods provide tools which pave the way of the real-time computation of reversible and almost-ideal time-frequency representations.

HAL (Le Centre pour la Communication Scientifique Directe), Sep 5, 2017

Dans cet article, plusieurs nouveaux estimateurs de modulation d'amplitude (AM) et de fréquence (... more Dans cet article, plusieurs nouveaux estimateurs de modulation d'amplitude (AM) et de fréquence (FM), dédiés aux signaux linéairement modulés sont étudiés. Premièrement, ces estimateurs sont comparés entre eux, puis avec d'autres méthodes issues de l'état de l'art en termes d'efficacité statistique. Deuxièmement, nous proposons d'appliquer ces nouveaux estimateurs à la modélisation sinusoïdale des signaux audio. Enfin, une nouvelle technique de séparation de sources s'appuyant sur les modulations cohérentes d'amplitude et de fréquence est proposée et évaluée sur des signaux musicaux.

HAL (Le Centre pour la Communication Scientifique Directe), Aug 26, 2019

-Cet article a pour thématique la représentation des signaux non-stationaires et multicomposantes... more -Cet article a pour thématique la représentation des signaux non-stationaires et multicomposantes conjointement en temps et en fréquence. Dans ce but, nous introduisons une nouvelle méthode reposant sur le synchrosqueezing temporel qui permet de calculer des représentations inversibles plus précises pour des signaux impulsionnels ou fortement modulés en fréquence. Dans un premier temps, nous proposons un estimateur amélioré de retard de groupe pour lequel nous établissons des liens théoriques avec un estimateur de modulation linéaire de fréquence. Ensuite, nous illustrons par des représentations discrétisées en temps et en fréquence les améliorations apportées par notre méthode lorsqu'elle est appliquée sur des signaux synthétiques.

2023 31st European Signal Processing Conference (EUSIPCO)

HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific re... more HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

HAL (Le Centre pour la Communication Scientifique Directe), Jul 1, 2017

HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific re... more HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

HAL (Le Centre pour la Communication Scientifique Directe), Dec 31, 2015

HAL (Le Centre pour la Communication Scientifique Directe), May 16, 2022

Proceedings of SPIE, Jan 17, 2010

This paper presents a novel approach for the multi-oriented text line extraction from historical ... more This paper presents a novel approach for the multi-oriented text line extraction from historical handwritten Arabic documents. Because of the multi-orientation of lines and their dispersion in the page, we use an image paving allowing us to progressively and locally determine the lines. The paving is initialized with a small window and then its size is corrected by extension until enough lines and connected components were found. We use the Snake for line extraction. Once the paving is established, the orientation is determined using the Wigner-Ville distribution on the histogram projection profile. This local orientation is then enlarged to limit the orientation in the neighborhood. Afterwards, the text lines are extracted locally in each zone basing on the follow-up of the baselines and the proximity of connected components. Finally, the connected components that overlap and touch in adjacent lines are separated. The morphology analysis of the terminal letters of Arabic words is here considered. The proposed approach has been experimented on 100 documents reaching an accuracy of about 98.6%.

IEEE Transactions on Signal Processing, 2018

Singular Spectrum Analysis (SSA) is a signal decomposition technique that aims at expanding signa... more Singular Spectrum Analysis (SSA) is a signal decomposition technique that aims at expanding signals into interpretable and physically meaningful components (e.g. sinusoids, noise, etc.). This article presents new theoretical and practical results about the separability of the SSA and introduces a new method called sliding SSA. First, the SSA is combined with an unsupervised classification algorithm to provide a fully automatic data-driven component extraction method for which we investigate the limitations for components separation in a theoretical study. Second, the detailed automatic SSA method is used to design an approach based on a sliding analysis window which provides better results than the classical SSA method when analyzing non-stationary signals with a time-varying number of components. Finally, the proposed sliding SSA method is compared to the Empirical Mode Decomposition (EMD) and to the synchrosqueezed Short-Time Fourier Transform (STFT), applied on both synthetic and real-world signals.

arXiv (Cornell University), Oct 11, 2022

The zeros of the spectrogram have proven to be a relevant feature to describe the time-frequency ... more The zeros of the spectrogram have proven to be a relevant feature to describe the time-frequency structure of a signal, originated by the destructive interference between components in the time-frequency plane. In this work, a classification of these zeros in three types is introduced, based on the nature of the components that interfere to produce them. Echoing noiseassisted methods, a classification algorithm is proposed based on the addition of independent noise realizations to build a 2D histogram describing the stability of zeros. Features extracted from this histogram are later used to classify the zeros using a non-supervised clusterization algorithm. A denoising approach based on the classification of the spectrogram zeros is also introduced. Examples of the classification of zeros are given for synthetic and real signals, as well as a performance comparison of the proposed denoising algorithm with another zero-based approach.

arXiv (Cornell University), Mar 30, 2021

In the last few years, Motor Current Signature Analysis (MCSA) has proven to be an effective meth... more In the last few years, Motor Current Signature Analysis (MCSA) has proven to be an effective method for electrical machines condition monitoring. Indeed, compared to vibration and temperature analysis, current measurement proves to be a convenient and non-invasive alternative. Moreover, it has proven to be a reliable method since many mechanical and electrical faults manifest as side-band spectral components generated around the fundamental frequency component of the motor's current. These components are called interharmonics and they are a major focus of fault detection using MCSA. However, the main drawback of this approach is that the interference of other more prevalent components such as the fundamental and noise components can obstruct the effect of interharmonics in the spectrum and may therefore affect fault detection accuracy. Thus, we propose in this paper an alternative approach that aims to decompose the different current components using a model based on a Vandermonde matrix, in order to monitor each component independently. Then, the tracking of each distinct component in time and spectral domains is implemented. This is achieved by estimating their respective relevant parameters using the Gradient Descent algorithm. This method has been favorably compared to an existing estimation algorithm (MUSIC) and its efficiency has been validated. The results of this work prove to be promising and establish the parametric tracking of the electrical current components using the Gradient Descent algorithm as a reliable monitoring approach.

arXiv (Cornell University), Mar 30, 2021

In the last few years, Motor Current Signature Analysis (MCSA) has proven to be an effective meth... more In the last few years, Motor Current Signature Analysis (MCSA) has proven to be an effective method for electrical machines condition monitoring. Indeed, compared to vibration and temperature analysis, current measurement proves to be a convenient and non-invasive alternative. Moreover, it has proven to be a reliable method since many mechanical and electrical faults manifest as side-band spectral components generated around the fundamental frequency component of the motor's current. These components are called interharmonics and they are a major focus of fault detection using MCSA. However, the main drawback of this approach is that the interference of other more prevalent components such as the fundamental and noise components can obstruct the effect of interharmonics in the spectrum and may therefore affect fault detection accuracy. Thus, we propose in this paper an alternative approach that aims to decompose the different current components using a model based on a Vandermonde matrix, in order to monitor each component independently. Then, the tracking of each distinct component in time and spectral domains is implemented. This is achieved by estimating their respective relevant parameters using the Gradient Descent algorithm. This method has been favorably compared to an existing estimation algorithm (MUSIC) and its efficiency has been validated. The results of this work prove to be promising and establish the parametric tracking of the electrical current components using the Gradient Descent algorithm as a reliable monitoring approach.

HAL (Le Centre pour la Communication Scientifique Directe), Jul 3, 2018

RESUME-L'un des plus grands défis de la production d'énergie éolienne est de lisser la fluctuatio... more RESUME-L'un des plus grands défis de la production d'énergie éolienne est de lisser la fluctuation de la puissance de sortie du générateur éolien dû à la variation aléatoire de la vitesse du vent. La fluctuation de la puissance éolienne se produit généralement sur une échelle de temps de quelques secondes à plusieurs heures. Ce travail traite de la fluctuation de la puissance éolienne sur des échelles de temps de l'ordre de la minute puisqu'elle est la plus souvent rencontrée et elle peut affecter la qualité de puissance du réseau électrique. Nous avons trouvé que le système de stockage d'énergie par supercondensateurs (SSES) est un moyen très utile pour compenser la puissance fluctuante puisqu'il est capable de contrôler les puissances active et réactive simultanément. Le vent est intermittent et aléatoire, donc une méthode appropriée a été choisie pour déterminer la puissance de référence du système de contrôle en minimisant le dimensionnement du système de stockage d'énergie requis.

RESUME-L'un des plus grands défis de la production d'énergie éolienne est de lisser la fluctuatio... more RESUME-L'un des plus grands défis de la production d'énergie éolienne est de lisser la fluctuation de la puissance de sortie du générateur éolien dû à la variation aléatoire de la vitesse du vent. La fluctuation de la puissance éolienne se produit généralement sur une échelle de temps de quelques secondes à plusieurs heures. Ce travail traite de la fluctuation de la puissance éolienne sur des échelles de temps de l'ordre de la minute puisqu'elle est la plus souvent rencontrée et elle peut affecter la qualité de puissance du réseau électrique. Nous avons trouvé que le système de stockage d'énergie par supercondensateurs (SSES) est un moyen très utile pour compenser la puissance fluctuante puisqu'il est capable de contrôler les puissances active et réactive simultanément. Le vent est intermittent et aléatoire, donc une méthode appropriée a été choisie pour déterminer la puissance de référence du système de contrôle en minimisant le dimensionnement du système de stockage d'énergie requis.

HAL (Le Centre pour la Communication Scientifique Directe), Jul 3, 2018

L'alimentation en électricité des sites isolés en mer tels que des îles ou des systèmes flottants... more L'alimentation en électricité des sites isolés en mer tels que des îles ou des systèmes flottants présente de nombreuses contraintes. Les sources d'énergie renouvelable les plus couramment utilisées sont les sources photovoltaïques et éoliennes. Cependant, leur intermittence et leur variabilité nécessitent l'utilisation de groupes électrogènes pour permettre la satisfaction de la demande. Avec le développement récent des énergies marines renouvelables, un système multi-sources intégrant des énergies marines est proposé dans cet article. Le potentiel énergétique des océans étant considérable, il s'avère en effet judicieux d'envisager l'exploitation des sources photovoltaïques, éoliennes, hydroliennes et houlomotrices pour alimenter des sites isolés en mer. Les ressources disponibles et les complémentarités potentielles pour l'île d'Ouessant sont d'abord présentées. Différentes configurations sont ensuite étudiées, permettant d'aboutir à un concept fiable en termes de satisfaction de la charge tout en considérant l'aspect économique.

2018 IEEE International Conference on Industrial Technology (ICIT), 2018

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific r... more HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. Multivariate abrupt change detectors Sarra Houidi, F. Auger, Houda Ben Attia Sethom, Laurence Miègeville, Dominique Fourer

Energies, 2020

Energy efficiency and low-carbon energy systems are increasingly taken into account in seaports, ... more Energy efficiency and low-carbon energy systems are increasingly taken into account in seaports, due to climate change challenges and the evolution of environmental regulations. Thus, technological breakthroughs must be brought to numerous systems in harbors, such as harbor cranes, seaport vehicles, or the power supply of berthed vessels. These aspects may require the establishment of a microgrid in the harbor area. Microgrids have been subjected to a wide development on the mainland and islands, mostly for domestic loads. However, these are still scarce in harbor areas. Their development in such places faces several challenges, such as high power requirements, monitoring and management of a wide range of loads, energy policy framework, etc. Moreover, the establishment of a microgrid involves a study of sizing and of energy management, to avoid prohibitive costs and to verify load requirements. This paper provides a literature survey related to the development of microgrids in seapo...

Zenodo (CERN European Organization for Nuclear Research), Jan 25, 2018

In this paper, we introduce the ASTRES * toolbox which offers a set of Matlab functions for non-s... more In this paper, we introduce the ASTRES * toolbox which offers a set of Matlab functions for non-stationary multicomponent signal processing. The main purposes of this proposal is to offer efficient tools for analysis, synthesis and transformation of any signal made of physically meaningful components (e.g. sinusoid, trend or noise). The proposed techniques contain some recent and new contributions, which are now unified and theoretically strengthened. They can provide efficient time-frequency or timescale representations and they allow elementary components extraction. Usage and description of each method are then detailed and numerically illustrated.

IEEE Signal Processing Letters, Oct 1, 1997

A geometrical description is given for reassignment vector fields of spectrograms. These vector f... more A geometrical description is given for reassignment vector fields of spectrograms. These vector fields are shown to be connected with both an intrinsic phase characterization and a scalar potential. This allows for the generalization of the original reassignment process to a differential version based on a dynamical evolution of time-frequency particles.

HAL (Le Centre pour la Communication Scientifique Directe), Aug 23, 2017

This paper introduces a new class of mother wavelet functions, based on a specific analysis windo... more This paper introduces a new class of mother wavelet functions, based on a specific analysis window which allows a recursive implementation of the Continuous Wavelet Transform (CWT). Using this new transform, we propose to compute a sharpened time-frequency representation by rewording the reassigned scalogram and the (first and second-order) synchrosqueezed CWT. We also propose an extension of the CWT reassignment operators, using the Levenberg-Marquardt algorithm, which can control the energy concentration of a reassigned scalogram through a damping parameter. Thus, our methods provide tools which pave the way of the real-time computation of reversible and almost-ideal time-frequency representations.

HAL (Le Centre pour la Communication Scientifique Directe), Sep 5, 2017

Dans cet article, plusieurs nouveaux estimateurs de modulation d'amplitude (AM) et de fréquence (... more Dans cet article, plusieurs nouveaux estimateurs de modulation d'amplitude (AM) et de fréquence (FM), dédiés aux signaux linéairement modulés sont étudiés. Premièrement, ces estimateurs sont comparés entre eux, puis avec d'autres méthodes issues de l'état de l'art en termes d'efficacité statistique. Deuxièmement, nous proposons d'appliquer ces nouveaux estimateurs à la modélisation sinusoïdale des signaux audio. Enfin, une nouvelle technique de séparation de sources s'appuyant sur les modulations cohérentes d'amplitude et de fréquence est proposée et évaluée sur des signaux musicaux.

HAL (Le Centre pour la Communication Scientifique Directe), Aug 26, 2019

-Cet article a pour thématique la représentation des signaux non-stationaires et multicomposantes... more -Cet article a pour thématique la représentation des signaux non-stationaires et multicomposantes conjointement en temps et en fréquence. Dans ce but, nous introduisons une nouvelle méthode reposant sur le synchrosqueezing temporel qui permet de calculer des représentations inversibles plus précises pour des signaux impulsionnels ou fortement modulés en fréquence. Dans un premier temps, nous proposons un estimateur amélioré de retard de groupe pour lequel nous établissons des liens théoriques avec un estimateur de modulation linéaire de fréquence. Ensuite, nous illustrons par des représentations discrétisées en temps et en fréquence les améliorations apportées par notre méthode lorsqu'elle est appliquée sur des signaux synthétiques.