Nonlinear Filters
Mostrando 1-12 de 33 artigos, teses e dissertações.
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1. IDENTIFICAÇÃO DE UM SISTEMA DE LODO ATIVADO DE PEQUENA ESCALA DESENVOLVIDO EM LABORATÓRIO / IDENTIFICATION OF A ACTIVATED SLUDGE SYSTEM ON SCALE SMALL DEVELOPED IN THE LABORATORY
In activated sludge systems, the dissolved oxygen is used by microorganisms to decompose organic matter and treatment of wastewater. In these systems the dynamics of dissolved oxygen has been seen as the main source of information to obtain online information about the treatment process. Thus, the development of an appropriate model for the dynamics of disso
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/07/2011
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2. Navegação terrestre usando unidade de medição inercial de baixo desempenho e fusão sensorial com filtro de Kalman adaptativo suavizado. / Terrestrial navigation using low-grade inertial measurement unit and sensor fusion with smoothed adaptive Kalman filter.
This work presents the development of the mathematical models and the algorithms of a sensor fusion system for terrestrial navigation using a low-grade inertial measurement unit (IMU) and the Extended Kalman Filter. The models were developed on the basis of the strapdown inertial navigation systems (SINS). Low-grade designates an IMU that is not able to perf
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 01/06/2011
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3. Desconvolução não supervisionada por filtros de erro de predição não lineares e recorrentes e sistemas imunologicos artificiais / Unsupervised deconvolution by nonlinear recurrent prediction-error filters and artificial immune systems
When data is transmitted trough a channel, it may be subject to several sorts of distortion that might cause unacceptable level of degradation. A very usual type of distortion is the intersymbol interference ,which is a consequence of the temporal spread of the information-bearing signal .To mitigate this interference ,it is usual to employ an equalizer ,whi
Publicado em: 2010
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4. Design of a multi-model observer-based estimator for Fault Detection and Isolation (FDI) strategy: application to a chemical reactor
This study presents a FDI strategy for nonlinear dynamic systems. It shows a methodology of tackling the fault detection and isolation issue by combining a technique based on the residuals signal and a technique using the multiple Kalman filters. The usefulness of this combination is the on-line implementation of the set of models, which represents the norma
Brazilian Journal of Chemical Engineering. Publicado em: 2008-12
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5. Estabilidade e síntese de controladores e filtros robustos para sistemas com retardo no tempo: novas fronteiras
This thesis is dedicated to the study of some inherent problems in continuous-time systems with time delay. The thesis is divided into two parts; the first one shows that to study the stability of an autonomous linear system with constant time delay is equivalent to assess the roots of a rational function of appopriate degree. The second part deals with a se
Publicado em: 2008
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6. Proposal of blind source separation methods for convolutive and nonlinear mixtures / Proposta de metodos de separação cega de fontes para misturas convolutivas e não-lineares
The problem of blind source separation (BSS) has attracted the attention of agrowing number of researchers, mostly due to its potential applications in a significant number of different areas. The objective of the present work is to propose new methods to solve the problem of BSS in the cases of convolutive mixtures and nonlinear mixtures. For the first case
Publicado em: 2007
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7. Determinação do conteúdo harmônico de corrente baseada em redes neurais artificiais para cargas não-lineares monofásicas / Determination of the current harmonic content based on artificial neural networks for single-phase non-linear loads
In this thesis artificial neural networks are employed in a novel approach to identifying harmonic components of the single-phase nonlinear load current, whose amplitudes and phase angles are subject to unpredictable changes in steady-state. An identified harmonics number is previously selected. These harmonics are present in the non-linear loads current of
Publicado em: 2007
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8. Amplificadores Ãpticos, estudos de polarizaÃÃo e geraÃÃo de pulso usando processos paramÃtricos em fibras Ãpticas
The recent telecommunication development can be, to a large extent, attributed to the capacity of transmitting information (video, sound and data) at high transmission rates (Tbits/s) through the optical fiber. The constant advances in the technological development of active and passive devices based on optical fibers have enabled a steady increase in commun
Publicado em: 2007
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9. Analise de componentes ciclicas em series temporais uni e multivariadas via filtros HP modificados e outros metodos / Cycle components analysis for uni and multivariate time throug modified Hodrick-Prescott filters and other methods
The analysis of cycles in time series is considered in this investigation through four methodologies, of which three were more recently developed in literature. The first method, proposed in Kaiser and Maravall (2001), is based on a modification of the unidimensional Hodrick-Prescot filter (HP) through ARIMA models approach. The second method, developed in M
Publicado em: 2007
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10. Detecção de descontinuidades e reconstrução de funções a partir de dados espectrais : filtros splines e metodos iterativos / Detection of discontinuities and reconstruction of functions from spectral data : splines filters and iterative methods
Detecting discontinuities from Fourier coefficients is a problem that arises in several areas of application. Important examples are Fourier methods in Computed Tomography, Nuclear Magnetic Resonance Inversion and Conservation Law Differential Equations. Also, the knowledge of the precise location of the discontinuity points is essential to obtain exponentia
Publicado em: 2006
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11. Monte Carlo methods in nonlinear filtering theory.
This thesis is focused on two basic aspects of the Control Problem: the stochastic modelling of physical systems, and Monte Carlo-based numerical approximation of the nonlinear filtering problem solution. In the first topic this thesis concerns about clarifying some issues in the mathematical modeling of continuous-time systems with Brownian motion. The hypo
Publicado em: 2006
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12. EqualizaÃÃo adaptativa e autodidata de canais lineares e nÃo-lineares utilizando o algoritmo do mÃdulo constante / Autodidact and adaptive equalization of the nonlinear and linear channels using the constant module algorithm
Este trabalho trata da proposiÃÃo de algoritmos para equalizaÃÃo cega de canais lineares e nÃao-lineares inspirados no Algoritmo do MÃdulo Constante (CMA). O CMA funciona de maneira bastante eficiente com constelaÃÃes nas quais todos os pontos possuem a mesma amplitude, como em modulaÃÃes do tipo Phase Shift Keying (PSK). Entretanto, quando os pont
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 05/08/2005