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Source : I-revues

3 - Conception d'antennes à faisceau constant sur une large bande à partir du vecteur covariance

LARDIES (J.) (1988)

A broadband constant beamwidth array technique is presented in this paper . It is shown that the number and the position of the sidelobes and the beamwidth of the processor are controlled by an operator who consider the covariance vector, formed from sensor data, with a weighting matrix which is a ...

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Source : I-revues

1 - Résolution particulaire et traitement non-linéaire du signal : applications RADAR/SONAR

DEL MORAL (P.) et al. (1995)

This paper introduces a general method for a particle solution to optimal nonlinear estimation in signal processing . We deal here with the class of discrete time Markov processes, to which the estimation problems of RADAR/SONAR signal processing belong. The main feature of particle resolution is ...

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Source : I-revues

3 - Estimation de paramètres à l'aide d'une antenne. Limites de précision

DEBART, Hubert (1985)

The present article investigates some applications of the very general "Cramer-Rao" inequality in the form of theoretical limitations for the measurements of quantities whose evaluation is difficult . In particular, an approach is developed to derive the resolving power of an antenna observing two ...

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Source : I-revues

3 - Système interactif pour la construction de questionnaires non arborescents

TERRENOIRE, Michel et al. (1987)

Various statistically-based classification methods use an arborescent structure . In order to optimize the use of the information given by the training set, it may be more efficient to build a non-arborescent structure . According to that approach, a "user friendly software is presented; this ...

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Source : I-revues

4 - Proposition d'un cadre probabiliste de fusion de croyances

PIAT (E.) et al. (1997)

This paper presents a methodology to achieve the fusion of believes associated to logical propositions . The belief concept is introduced within the framework of logic and probability theory and the problem dealt with is the following : if different experts give their advice about a membership ...

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Source : I-revues

8 - Un système multi-agents pour la fusion de données en analyse d'images

LEFEVRE (V.) et al. (1996)

The data fusion of results in image processing poses many problems of modelling and representation of knowledge, among whic h one can mention : o the difficulty to define, exhaustively, the conditions of utilization of processings in function of the context , the difficulty to evaluate the results ...

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Source : I-revues

07 - Une nouvelle méthode de décodage des codes de Reed-Solomon

DORNSTETTER, Jean-Louis (1984)

We show that a basic property of the parity check matrix of Reed-Solomon codes yields a new key-equation for the decoding problem that is different from the classical one given by Berlekamp . We present an efficient algorithm for solving this new key-equation . On montre qu'une propriété ...

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Source : I-revues

1 - Détection-estimation récursive rapide de séquences Bernoulli-gaussiennes

GOUSSARD (Y.) et al. (1987)

This article deals with the problem of deconvolution of Bernoulli-Gaussian random processes observed through linear systems . This corresponds to situations that occur frequently in areas like geophysics, ultrasonic imaging or nondestructive inspection . Deconvolution of such signais is a detection- ...

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Source : I-revues

8 - Caractérisation d'un système d'injection par analyse temps-fréquence

COURBEBAISSE (G.) (1995)

The aim of this study is to provide a better understanding while the injectio n system of Diesel engine is running, by measuring the forward movement of the nozzle inside a testing fence system . As a matter of fact, one use non parametric methods of signal processing are used, such as the Wigner– ...

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