Valentin Félix

Groupe de Recherches sur l'Energétique des Milieux Ionisés

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Rémi Dussart

Groupe de Recherches sur l'Energétique des Milieux Ionisés

Philippe Lefaucheux

Groupe de Recherches sur l'Energétique des Milieux Ionisés

Lawrence Overzet

The University of Texas at Dallas

Volker Schulz-von der Gathen

Ruhr University Bochum

Judith Golda

Ruhr University Bochum

Mukesh Kulsreshath

University of Bristol

Olivier Aubry

Université d'Orléans

Thomas Tillocher

Groupe de Recherches sur l'Energétique des Milieux Ionisés

Laurent Schwaederlé

Groupe de Recherches sur l'Energétique des Milieux Ionisés

Arnaud Stolz

Centre National de la Recherche Scientifique

Cooperative Institutions

Naval Physical & Oceanographic Laboratory

Centre National de la Recherche Scientifique

Groupe de Recherches sur l'Energétique des Milieux Ionisés

Université d'Orléans

Ruhr University Bochum

Plasma (Russia)

Institute of Experimental Physics of the Slovak Academy of Sciences

Indian Institute of Science Bangalore

The University of Texas at Dallas

Indian Institute of Technology Bombay

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Passive Sonar Detection in Presence of Non Gaussian Noise

IETE Technical Review (1993)

Valentin Félix S P Pillai

In ocean acoustics two important characteristics of the background noise that are variable are the type of noise distribution and the noise power. Signal detectors for a sonar operating in such diverse conditions should be designed for optimum performance, irrespective of the variation in noise statistics. Unlike parametric detectors, Non parametric (NP) detectors maintain a constant level of performance in Gaussian as well as non Gaussian noise and are immune to noise power fluctuation. An analysis of performance of the detectors show that NP detector is better in non Gaussian noise but parametric detector is better in Gaussian noise.

Gaussian Noise

Noise power

10.1080/02564602.1993.11437307

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A comparative study on quiescent beam pattern design techniques

G.R Anupama R. Pradeepa Valentin Félix

This paper discusses a number of beam pattern design algorithms for non adaptive beamforming, compares them and assesses their performances for different array geometries. Three techniques for designing a beam pattern are considered of which, the Dolph-Chebychev shading belongs to the traditional class and the Griffiths and Tseng's iterative algorithm as well as the Bell and Van Trees' algorithm belong to adaptive array approach. The comparative study brings out the advantages and limitations of these techniques, aiding the selection of an appropriate pattern synthesis algorithm.

Adaptive beamformer

Beam pattern

10.1109/indcon.2012.6420709

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Development of microdicharge arrays in silicon operating in DC and AC

HAL (Le Centre pour la Communication Scientifique Directe) (2012)

Mukesh Kulsreshath Laurent Schwaederlé Lawrence Overzet Thomas Tillocher Sébastien Dozias

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Ignition and operation of microdischarge arrays on silicon wafers

HAL (Le Centre pour la Communication Scientifique Directe) (2017)

Rémi Dussart Ronan Michaud Valentin Félix Olivier Aubry Arnaud Stolz

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A study of numerical linear algebra library in the context of adaptive array beamforming

V. P. Sreekanth Sooraj K. Ambat Valentin Félix

Sonar system is an embodiment of sensor signal processing, designed to extract information from the real world, which shares much embedded computing application. The complexity of the most modern computing platforms has made it extremely difficult to write numerical code that achieves the best possible performance. In this paper, we discuss Intel Math Kernel Library (MKL) as a mathematical software package for scientific and technical computation for ease of use in Intel-architecture based COTS (commercial off- the-shelf) systems that can vary greatly. Here we discuss how the advances in computing platform can advantage the sonar signal processing system. We have taken adaptive beamforming as the case study for the comparison of improvements from direct implementation to implementation using linear algebra library for COTS systems.

Kernel (algebra)

Linear algebra

Adaptive beamformer

Sonar signal processing

10.1109/sympol.2009.5664124

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Microhollow cathode discharges on silicon devices

HAL (Le Centre pour la Communication Scientifique Directe) (2017)

Rémi Dussart Ronan Michaud Valentin Félix Olivier Aubry Arnaud Stolz

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Perceptually optimum gray-scale transformation of multibin time history data

IEEE Journal of Oceanic Engineering (1997)

Valentin Félix R. Narasimman R.C. Agarwal

Gray-scale displays of a time history of data in multiple channels are encountered in various applications. The signal tracks in a noisy display often have to be detected by a human operator. To exploit the pattern-recognition capability of the human "receiver", the perceptual factors influencing visual discrimination needs to be incorporated into the gray-scale transformation scheme of the data. To this end, an objective function, viz. the total perceived entropy, is proposed in this paper for optimum gray-scale quantizer design. Two types of quantizers, one designed with unconstrained maximization of the objective function and another which maximizes the objective function with the constraint enforced by Weber's law, are proposed. It is demonstrated, using simulated spectrogram data, that these quantizers provide better signal track discrimination than Lloyd-Max quantization.

Spectrogram

Maximization

10.1109/48.557552

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Caractérisation de matrices de micro plasmas sur silicium

HAL (Le Centre pour la Communication Scientifique Directe) (2012)

Mukesh Kulsreshath Laurent Schwaederlé Valentin Félix Philippe Lefaucheux Thomas Tillocher

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Ignition phase of a silicon-based microdischarge array with excitation by burst waveforms