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    Wyświetlanie 1-5 z 5
    Tytuł:
    Modification of robust filtering of stratified surface topography
    Autorzy:
    Dobrzański, P.
    Pawlus, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/220827.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    two-process surfaces
    digital filtering
    robust filter
    valley suppression filter
    modification of filter
    Opis:
    Various components of surface texture are identified, namely form, waviness and roughness. Separation of these components is done by digital filtering. Several problems exist during analysis of two-process surfaces. Therefore the Gaussian robust profile filtering technique was established and has been studied here. The computer generated 2D profiles and 3D surface topographies having triangular scratches as well as measured stratified surfaces were subjected to filtration. However even robust filter applications cause distortion of profiles having valleys wider than 100 ěm. In order to minimize the distortion associated with wide and deep valleys, the robust filter should be modified. A special procedure was elaborated for minimizing distortion of roughness profiles caused by filtration. Application of this method to analyses of several profiles was presented. The difference between 1-D and 2-D filtering of surface topography using the same kind of filter was discussed. As a result we found that modification of a 2-D surface topography filter was not necessary.
    Źródło:
    Metrology and Measurement Systems; 2013, 20, 1; 107-118
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of Improved Robust Kalman Filter in Data Fusion for PPP/INS Tightly Coupled Positioning System
    Autorzy:
    Li, Z.
    Yao, Y.
    Wang, J.
    Gao, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/221374.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    PPP/INS tightly coupled positioning
    robust filter
    IGG scheme
    Mahalanobis distance
    Opis:
    A robust Kalman filter improved with IGG (Institute of Geodesy and Geophysics) scheme is proposed and used to resist the harmful effect of gross error from GPS observation in PPP/INS (precise point positioning/inertial navigation system) tightly coupled positioning. A new robust filter factor is constructed as a three-section function to increase the computational efficiency based on the IGG principle. The results of simulation analysis show that the robust Kalman filter with IGG scheme is able to reduce the filter iteration number and increase efficiency. The effectiveness of new robust filter is demonstrated by a real experiment. The results support our conclusion that the improved robust Kalman filter with IGG scheme used in PPP/INS tightly coupled positioning is able to remove the ill effect of gross error in GPS pseudorange observation. It clearly illustrates that the improved robust Kalman filter is very effective, and all simulated gross errors added to GPS pseudorange observation are successfully detected and modified.
    Źródło:
    Metrology and Measurement Systems; 2017, 24, 2; 289-301
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improved classification robust Kalman filtering method for precise point positioning
    Autorzy:
    Zhang, Qieqie
    Zhao, Long
    Zhou, Jianhua
    Powiązania:
    https://bibliotekanauki.pl/articles/220468.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Kalman filter
    classification robust
    equivalent weight function
    precise point positioning
    Opis:
    The accuracy and reliability of Kalman filter are easily affected by the gross errors in observations. Although robust Kalman filter based on equivalent weight function models can reduce the impact of gross errors on filtering results, the conventional equivalent weight function models are more suitable for the observations with the same noise level. For Precise Point Positioning (PPP) with multiple types of observations that have different measuring accuracy and noise levels, the filtering results obtained with conventional robust equivalent weight function models are not the best ones. For this problem, a classification robust equivalent weight function model based on the t-inspection statistics is proposed, which has better performance than the conventional equivalent weight function models in the case of no more than one gross error in a certain type of observations. However, in the case of multiple gross errors in a certain type of observations, the performance of the conventional robust Kalman filter based on the two kinds of equivalent weight function models are barely satisfactory due to the interaction between gross errors. To address this problem, an improved classification robust Kalman filtering method is further proposed in this paper. To verify and evaluate the performance of the proposed method, simulation tests were carried out based on the GPS/BDS data and their results were compared with those obtained with the conventional robust Kalman filtering method. The results show that the improved classification robust Kalman filtering method can effectively reduce the impact of multiple gross errors on the positioning results and significantly improve the positioning accuracy and reliability of PPP.
    Źródło:
    Metrology and Measurement Systems; 2019, 26, 2; 267-281
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelowanie zakłóceń impulsowych w przetwarzaniu sygnałów biomedycznych
    Impulsive noise modeling in biomedical signal processing
    Autorzy:
    Pander, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/158197.pdf
    Data publikacji:
    2007
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    zakłócenia impulsowe
    filtr miriadowy
    filtr medianowy
    rozkłady α-stabilne
    metody odporne
    impulsive noise
    myriad filter
    median filter
    SαS distribution
    robust methods
    Opis:
    Literatura cyfrowego przetwarzania sygnałów jest zdominowana przez założenie o gaussowskim charakterze zakłóceń. Jednak w rzeczywistych warunkach zakłócenia charakteryzują się rozkładami innymi niż gaussowskie. Często zakłócenia mają charakter impulsowy. Z uwagi na dużą liczbę sygnałów elektrofizjologicznych, do badań został wybrany sygnał EKG. Podczas przeprowadzania prób wysiłkowych zakłócenia mięśniowe wykazują charakter impulsowy. Celem pracy jest przedstawienie różnych modeli zakłóceń impulsowych stosowanych do zakłócania sygnałów biomedycznych. W pracy zostaną przedstawione następujące modele zakłóceń: Gaussa-Bernoulliego, Gaussa-Laplace'a, Gaussa-Cauchy'ego oraz model wykorzystujący symetryczne rozkłady alfa-stabilne. Symulowane zakłócenia są dodawane do sygnału o zadanej wartości SNR. Następnie wykorzystując filtrację liniową oraz nieliniową zostaną zmierzone zniekształcenia resztowe w sygnale po filtracji.
    A literature of digital signal processing is dominated by the assumption of Gaussian distribution of disturbances. But in a real world of signals such statement is too optimistic. Some noises distributions differ from the idealistic Gaussian model. Noises are often impulsive in their nature. There exists many different electrophysiological signals, but for the purpose of this work the electrocardiogram (ECG signal) was chosen. This signal is almost always disturbed by a noise. A noise that appears in ECG signals during the stress test (mainly a muscle noise) has an impulsive nature. The main aim of this work is to present different models of an impulsive noise. In this paper the following models of impulsive disturbances are introduced: a Gaussian-Bernoulli, a Gaussian-Laplace, a Gaussian-Cauchy and a symmetric alpha-stable model. Simulated noise is added to signal with known values of SNR. Then the linear and nonlinear filtering methods are applied and the rest distortions in a filtered signal are measured.
    Źródło:
    Pomiary Automatyka Kontrola; 2007, R. 53, nr 9 bis, 9 bis; 429-432
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An unscented Kalman filter in designing dynamic GMDH neural networks for robust fault detection
    Autorzy:
    Mrugalski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/331364.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    robust fault detection
    nonlinear system identification
    dynamic GMDH neural network
    unscented Kalman filter
    detekcja uszkodzeń
    identyfikacja nieliniowa
    sieć neuronowa dynamiczna
    filtr Kalmana bezśladowy
    Opis:
    This paper presents an identification method of dynamic systems based on a group method of data handling approach. In particular, a new structure of the dynamic multi-input multi-output neuron in a state-space representation is proposed. Moreover, a new training algorithm of the neural network based on the unscented Kalman filter is presented. The final part of the work contains an illustrative example regarding the application of the proposed approach to robust fault detection of a tunnel furnace.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2013, 23, 1; 157-169
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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