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Tytuł:
Estimation of UFMC Fading Channels Using H∞ Filter
Autorzy:
Jamoos, Ali
Powiązania:
https://bibliotekanauki.pl/articles/308699.pdf
Data publikacji:
2020
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
5G
autoregressive model
channel estimation
fading channel
H ∞ filter
Kalman filter
LMS filter
RLS filter
UFMC
Opis:
Universal filtered multi-carrier (UFMC) modulation is a very powerful candidate to be employed for future 5G mobile systems. It overcomes the limitations and restrictions in current modulation techniques employed in 4G mobile systems and supports future applications, such as machineto-machine (M2M), device-to-device (D2D), and vehicle-tovehicle (V2V) communications. In this paper, we address the estimation of UFMC fading channels based on the comb-type pilot arrangement in the frequency domain. The basic solution is to estimate the fading channel based on the mean square error (MSE) or least square (LS) criteria with adaptive implementation using least mean square (LMS) or recursive least square (RLS) algorithms. However, these adaptive filters seem not to be effective, as they cannot fully exploit fading channel statistics, particularly at high Doppler rates. To take advantage of these statistics, time-variations of the fading channel are modeled by an autoregressive process (AR), and are tracked by an H∞ filter. This, however, requires that AR model parameters be known, which are estimated by solving the Yule-Walker equation (YWE), based on the Bessel autocorrelation function (ACF) of the fading channel with a known Doppler rate. Results of Matlab simulations show that the proposed H∞ filter-based channel estimator is more effective when compared with existing estimators.
Źródło:
Journal of Telecommunications and Information Technology; 2020, 2; 28-35
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development of high dust capacity, high efficiency engine air filter with nanofibres
Autorzy:
Jaroszczyk, T.
Fallon, S. L.
Schwartz, S. W.
Powiązania:
https://bibliotekanauki.pl/articles/247590.pdf
Data publikacji:
2008
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
engine air filter
multi-media filter design
nanofiber filter media
air filter performance
filter efficiency
dust holding capacity
reentrainment
testing
Opis:
Although dust-holding capacity is the primary feature of engine air filters operating in dusty environments, efficiency becomes a major factor when selecting an engine air filter. Inertial separators and high porosity or fibrous prefilters are commonly used to decrease the dust load to the main filter while high efficiency is achieved by utilizing submicron or nanofiber fibers in the main filter. The patented multi-stage filter was designed to achieve ultra-high particle removal efficiency and dust holding capacity, and long life in dusty and on highway environments. The main (final) filter is located downstream of the prefilter. The main filter is made ofpleatedfilter media containing nanofibers with a diameter in the range of40 - 800 nanometers. The upstream in-line precleaner utilizing flow-through mini cyclones has separation efficiency of 95%. A high dust capacity, high efficiency prefilter can be used instead of the precleaner. The prefilter is made of vertically lapped nonwoven filter media made from synthetic fibers of different materials to fully utilize the tribological effect. The volume of the prefilter is determined by the performance required and space allotted. This paper discusses the filter performance of high dust holding capacity engine air filters. Filter specifications, design and performance are discussed in detail. Performance characteristics of the media and full size filters were determined using on-line particle counters and the gravimetric test method. Initial and final efficiency, and dust loading performance characteristics, are provided.
Źródło:
Journal of KONES; 2008, 15, 3; 215-224
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
FIR Filter Design Using Distributed Maximal Flatness Method
Autorzy:
Blok, M.
Powiązania:
https://bibliotekanauki.pl/articles/227316.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
digital filter design
fractional delay filter
distributed maximal flatness
differentiator
Nyquist filter
variable fractional delay
Opis:
In the paper a novel method for filter design based on the distributed maximal flatness method is presented. The proposed approach is based on the method used to design the most common FIR fractional delay filter - the maximally flat filter. The MF filter demonstrates excellent performance but only in a relatively narrow frequency range around zero frequency but its magnitude response is no greater than one. This "passiveness" is the reason why despite of its narrow band of accurate approximation, the maximally flat filter is widely used in applications in which the adjustable delay is required in feedback loop. In the proposed method the maximal flatness conditions forced in standard approach at zero frequency are spread over the desired band of interest. In the result FIR filters are designed with width of the approximation band adjusted according to needs of the designer. Moreover a weighting function can be applied to the error function allowing for designs differing in error characteristics. Apart from the design of fractional delay filters the method is presented on the example of differentiator, raised cosine and square root raised cosine FIR filters. Additionally, the proposed method can be readily adapted for variable fractional delay filter design regardless of the filter type.
Źródło:
International Journal of Electronics and Telecommunications; 2013, 59, 1; 59-66
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A study on the performance comparison of three optimal Alpha-Beta-Gamma filters and Alpha-Beta-Gamma-Eta filter for a high dynamic target
Autorzy:
Jeong, T.
Njonjo, A.W.
Pan, B.F.
Powiązania:
https://bibliotekanauki.pl/articles/116598.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
integrated navigation
Alpha-Beta-Gamma filter
Benedict-Bordner filter
Simpson filter
Gray-Murray filter
target dynamics
Alpha-Beta-Gamma-Eta filter
Kalman filter
Opis:
The Alpha-Beta-Gamma tracking filter is useful for tracking a constant acceleration target with zero lag error in the steady state. It, however, depicts a constant lag error for a maneuvering target. Various algorithms of the Alpha-Beta-Gamma tracking filter exist in literature and each one of them presents its own unique challenges and advantages depending on the design requirement. This study investigates the operation of three Alpha-Beta-Gamma tracking filter design methods which include Benedict-Bordner also known as the Simpson filter, Gray-Murray filter and the fading memory constant acceleration filter. These filters are then compared based on the ability to reduce noise and follow a maneuvering target with minimum lag error, against the jerky model Alpha-Beta-Gamma-Eta. Results obtained from simulations of the input model of the target dynamics under consideration indicate an improvement in performance of the jerky model in comparison with the constant acceleration models.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2017, 11, 1; 55-61
2083-6473
2083-6481
Pojawia się w:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Projekty aktywnych filtrów analogowych
Projects of analog active filters
Autorzy:
Kagankiewicz, F.
Powiązania:
https://bibliotekanauki.pl/articles/1366448.pdf
Data publikacji:
2018
Wydawca:
Centralny Ośrodek Badawczo-Rozwojowy Aparatury Badawczej i Dydaktycznej, COBRABiD
Tematy:
filtry
filtry analogowe
filtry aktywne
filtry dolnoprzepustowe
filtry górnoprzepustowe
filters
analog filter
active filter
lowpass filter
highpass filter
Opis:
Punktem wyjścia do artykułu był fakt, że nie w każdej aplikacji jest możliwe wykorzystanie filtrów cyfrowych, w związku z czym podjęto się wykonania projektów aktywnych filtrów analogowych. W pracy opisano metody projektowania aktywnych filtrów analogowych. Przedstawiono trzy główne metody projektowania takie jak Sallen-Key, Multiple Feedback oraz Linkwitz-Riley. W drugiej części pracy zostały przedstawione dwa projekty filtrów: dolnoprzepustowego oraz górnoprzepustowego, o częstotliwości granicznej 1 kHz, które miały za zadanie charakteryzować się wysokim tłumieniem w paśmie zaporowym.
The starting point for the article was the fact that it is not possible to use digital filters in every application, therefore active analogue filter designs have been made. The paper describes methods of designing active analog filters, three main design methods are presented, such as Sallen-Key, Multiple Feedback and Linkwitz-Riley. The second part of the work presents two designs of lowpass and highpass filters, which have 1 kHz limit frequency. The objective was that filters should have a high attenuation in the stop band.
Źródło:
Aparatura Badawcza i Dydaktyczna; 2018, 23, 3; 122-127
2392-1765
Pojawia się w:
Aparatura Badawcza i Dydaktyczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of transients in multiple power filter circuit comprising C-type filter
Autorzy:
Warecki, J.
Gajdzica, M.
Powiązania:
https://bibliotekanauki.pl/articles/377600.pdf
Data publikacji:
2018
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
capacitor
reactor
C–type filter
single-tuned passive filter
switching transient
transient overvoltage
transient overcurrent
Opis:
Passive filters are widely used to mitigate the effect of load harmonics on the supply power grid. Topology selection of the filters is based on the frequency bandwidth to be suppressed. Filter topologies comprising single-tuned filters and damped filters are the most popular in industrial power system applications. The article focuses on the influence of the damped C-type 2nd harmonic filter on the transients behavior under arc transformer energization in the arc furnace power supply system compensated by SVC. The examination results of transient currents and voltages across capacitors and reactors of the 3rd and 5th passive filters are compared for two topologies of the SVC filter circuits: with and without C-type filter. The Matlab/Simulink Software was used to modeling filter behavior during unload transformer switching-on.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2018, 95; 105-115
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Estimation of filter order for prescribed, reduced group delay FIR filter design
Autorzy:
Konopacki, J.
Mościńska, K.
Powiązania:
https://bibliotekanauki.pl/articles/199999.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
digital filters
FIR filter design
filter order estimation
filtry cyfrowe
projekt filtru FIR
filtr FIR
Opis:
FIR filters are often applied, as they possess many advantages, including linear-phase response and well elaborated design methods. However, group delay introduced by FIR filters is usually large. The reduction of group delay can be obtained by restriction of the linear phase requirement only to the passband. One of the problems that appear while designing FIR filters with a prescribed value of group delay is the choice of the filter order. In the paper a formula for filter order calculation for the given filter parameters and dedicated for equiripple or quasi-equiripple approximation of the magnitude response has been derived based on experiments. Numerous examples that explain how to use the derived formula have been included.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 1; 209--216
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Digital filter tuned according to spectral analysis of direct drive to reduce mechanical resonance effect
Autorzy:
Łuczak, D.
Powiązania:
https://bibliotekanauki.pl/articles/97189.pdf
Data publikacji:
2012
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
digital filter
mechanical resonance
filter
Opis:
Review of the filter structures and spectral analysis algorithms was done. Digital filters allow filtering the speed signal in control loop of direct drive with a mechanical resonance. The analogue filter equations were transformed into digital filters to enable tune them in real time. Spectral analysis with additional algorithm allows to determine the mechanical resonance frequency of multi-mass system. Determination of resonance frequencies allow for proper tune the digital filter. This paper presents selected algorithms of determine signal spectrum. In order to determine the mechanical resonance frequency from the whole spectrum, it is require to use an additional algorithm that was omitted from the consideration. Filters were tuned according to frequency characteristics of the object.
Źródło:
Computer Applications in Electrical Engineering; 2012, 10; 194-204
1508-4248
Pojawia się w:
Computer Applications in Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability analysis of hybrid active power filter
Autorzy:
Buła, D.
Pasko, M.
Powiązania:
https://bibliotekanauki.pl/articles/201452.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
active power filter
hybrid filter
power quality
higher harmonics
stability analysis
Opis:
In the paper the analysis of a three-phase hybrid active power filter stability has been presented. Configuration with a single tuned passive filter was used as an example. However, the analysis can be applied to similar configurations of hybrid filters with closed loop control. The article presents a model of the analyzed system in the frequency domain. The division of the model into two independent systems, for positive and negative components, allowed to apply the Nyquist criterion for the stability analysis in this case. As a part of the analysis, the effect of delays, control signal filter parameters, and passive filter parameters have been examined. Based on the presented stability analysis, system parameters for the experimental model of a hybrid power filter have been selected. Finally, experimental results confirming the validity of the analysis have been shown.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 2; 279-286
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wielokrotny filtr cząsteczkowy w estymacji stanu systemów dynamicznych
MultiPDF Particle Filter for State Estimation of Dynamical Systems
Autorzy:
Michalski, Jacek
Kozierski, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/274890.pdf
Data publikacji:
2019
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
estymacja stanu
systemy dynamiczne
filtr Bayesa
filtr cząsteczkowy
algorytm Bootstrap
wielokrotny filtr cząsteczkowy
state estimation
dynamical systems
Bayesian Filter
Particle Filter
Bootstrap Filter
MultiPDF Particle Filter
Opis:
W artykule poruszono problem estymacji stanu systemów dynamicznych oraz zaproponowano nową metodę jego rozwiązania – wielokrotny filtr cząsteczkowy. Jest to odmiana filtru cząsteczkowego pozwalająca na zrównoleglenie jego pracy przez podział na niezależne filtry tak, by umożliwić implementację algorytmu, także na urządzeniach o niedużej mocy obliczeniowej. Algorytm został zaimplementowany dla obiektu jedno- oraz wielowymiarowego, a jakość estymacji porównano dla różnej liczby cząsteczek. Do oceny działania algorytmu wykorzystano wskaźnik jakości aRMSE. Na podstawie badań stwierdzono, iż zrównoleglenie pracy filtru cząsteczkowego może poprawić działanie algorytmu.
In this paper the problem of state estimation of dynamical systems has been discussed and the new solution, named MultiPDF Particle Filter has been proposed. It is a modification of Particle Filter that allows to parallelize its work by dividing into independent filters in a way to enable the implementation of the algorithm also on devices with low computing power. The algorithm has been implemented for a one- and multi-dimensional object, and the quality of the estimation has been compared for a different number of particles. The quality index aRMSE has been used to evaluate the algorithm’s performance. Based on the simulation results it was found that the work parallelization of a Particle Filter can improve estimation quality of the algorithm.
Źródło:
Pomiary Automatyka Robotyka; 2019, 23, 1; 11-16
1427-9126
Pojawia się w:
Pomiary Automatyka Robotyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Compounding Objects
Autorzy:
Šikić, Zvonimir
Powiązania:
https://bibliotekanauki.pl/articles/749886.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
Łoś's theorem
converse of Łoś's theorem
filter
proper filter
ultrafilter
Opis:
We prove a characterization theorem for filters, proper filters and ultrafilters which is a kind of converse of Łoś's theorem. It is more natural than the usual intuition of these terms as large sets of coordinates, which is actually unconvincing in the case of ultrafilters. As a bonus, we get a very simple proof of Łoś's theorem.
Źródło:
Bulletin of the Section of Logic; 2020, 49, 2
0138-0680
2449-836X
Pojawia się w:
Bulletin of the Section of Logic
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Square Root Raised Cosine Fractionally Delaying Nyquist Filter : Design and Performance Evaluation
Autorzy:
Hermanowicz, E.
Rojewski, M.
Powiązania:
https://bibliotekanauki.pl/articles/226102.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
SRRC
Square Root Raised Cosine
Nyquist filter
special FIR
Finite Impulse Response
filter design
ISI
Intersymbol Interference
fractional delay filter
Opis:
In this paper we propose a discrete-time FIR (Finite Impulse Response) filter which is meant to be applied as a square root Nyquist filter and fractional delay filter simultaneously. The filter enables to substitute for a cascade of square root raised cosine (SRRC) Nyquist filter and fractional delay filter in one device/algorithm. The aim is to compensate for transmission delay in digital communication system. Performance of the filter in the role of a matched filter is evaluated using a newly defined energetic ISI (Intersymbol Interference) measure and ability of the filter to completely eliminate the ISI involved by fractional delay of symbol shaping filter in transmitter or by channel delay. Considerations and results of the contribution are documented by suitable eye-diagrams and the SRRC filter responses.
Źródło:
International Journal of Electronics and Telecommunications; 2014, 60, 3; 247-252
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recent development in heavy duty engine air filtration and the role of nanofiber filter media
Autorzy:
Jaroszczyk, T.
Petrik, S.
Donahue, K.
Powiązania:
https://bibliotekanauki.pl/articles/245716.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
engine air induction system
filtration process modelling
filtration mechanisms
filter development process
nanofiber filter media
air filter performance
filter efficiency
dust holding capacity
reentrainment
testing
Opis:
The development of an engine air filter is based on filter performance requirements, vehicle 's operational environment, available space, filter media properties, and production technology. The design process includes analyses of theoretical and empirical models describing filter media performance and aerosol flow in filter housings and through filter elements. Filter media are carefully selected based upon these models and simplified laboratory tests. The filter element design is evaluated in great detail through a series of laboratory and field experiments. The role of the engine air induction system has increased because of recent engine exhaust particulate and evaporative emission regulations. Engine lifetime, engine emission and fuel consumption depend on the air induction system design and its performance. Providing optimized solutions for these requirements dictates filter development trends. This drives the need for smaller, more compact filters and more efficient filter media with higher permeability. The efficiency can be drastically improved by applying a layer of nanofibers to a cellulose or synthetic substrate. The ISO fractional efficiency test method, that in its final stage of development, can clearly show the advantage of nanofiber filter media. This paper discusses air cleaner design including the newest in-line reduced volume air cleaners and the role of nanofiber filter media in engine air filtration.
Źródło:
Journal of KONES; 2009, 16, 4; 207-216
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Auxiliary and Rao-Blackwellised particle filters comparison
Autorzy:
Kozierski, P.
Lis, M.
Powiązania:
https://bibliotekanauki.pl/articles/376777.pdf
Data publikacji:
2013
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
particle filters
PF
SIR algorithm
Bootstrap Filter
Auxiliary Particle Filter
Rao-Blackwellised Particle Filter
Opis:
Particle filters are very popular - number of algorithms based on Sequential Monte Carlo methods is growing. Paper describes and compares the performance of two of them - Auxiliary and Rao-Blackwellised Particle Filters. Comparison includes also Bootstrap Filter and some variety of SIR algorithm.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2013, 76; 79-88
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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:
Comparison of estimation accuracy of EKF, UKF and PF filters
Autorzy:
Konatowski, S.
Kaniewski, P.
Matuszewski, J.
Powiązania:
https://bibliotekanauki.pl/articles/320725.pdf
Data publikacji:
2016
Wydawca:
Polskie Forum Nawigacyjne
Tematy:
non-linear filtering
extended Kalman filter
unscented Kalman filter
particle filter
Opis:
Several types of nonlinear filters (EKF — extended Kalman filter, UKF — unscented Kalman filter, PF — particle filter) are widely used for location estimation and their algorithms are described in this paper. In the article filtering accuracy for non-linear form of measurement equation is presented. The results of complex simulations that com-pare the quality of estimation of analyzed non-linear filters for complex non-linearities of state vector are presented. The moves of maneuvering object are described in two-dimensional Cartesian coordinates and the measurements are described in the polar coordinate system. The object dynamics is characterized by acceleration described by the univariate non-stationary growth model (UNGM) function. The filtering accuracy was evaluated not only by the root-mean-square errors (RMSE) but also by statistical testing of innovations through the expected value test, the whiteness test and the WSSR (weighted sum squared residual) test as well. The comparison of filtering quality was done in the MATLAB environment. The presented results provide a basis for designing more accurate algorithms for object location estimation.
W artykule opisane zostały algorytmy filtrów nieliniowych (rozszerzony EKF i bezśladowy UKF filtr Kalmana oraz filtr cząstkowy PF) stosowane powszechnie do estymacji położenia. Porównano dokładność estymacji tych filtrów dla nieliniowego równania pomiarowego. Zaprezentowane zostały rezultaty badań symulacyjnych porównujących jakość estymacji analizowanych rodzajów filtrów nieliniowych dla złożonej nieliniowości wektora stanu. Ruch obiektu manewrującego opisano w dwuwymiarowym układzie kartezjańskim, natomiast pomiary w polarnym układzie współrzędnych. Dynamikę obiektu charakteryzuje przyspieszenie opisane funkcją Univariate-Non-Stationary-Growth-Model. Efektywność badań, poza określaniem błędów średniokwadratowych RMSE, oceniano poprzez statystyczne testowanie innowacji za pomocą: testu wartości oczekiwanej, testu białości oraz testu WSSR (Weighted-Sum-Squared-Residual). Ocena jakości procesu filtracji została przeprowadzona w środowisku MATLAB. Przedstawione wyniki stanowią podstawę do projektowania dokładniejszych algorytmów estymacji położenia obiektu.
Źródło:
Annual of Navigation; 2016, 23; 69-87
1640-8632
Pojawia się w:
Annual of Navigation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Nearly Optimal Fractional Delay Filter Design Using an Asymmetric Window
Autorzy:
Sac, M.
Blok, M.
Powiązania:
https://bibliotekanauki.pl/articles/227063.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
asymmetric window
extracted window
fractional delay filter
nearly optimal filter
window method
Opis:
In this paper a numerically efficient filter design method suitable for variable fractional delay (VFD) filter implementation is investigated. We propose to use a well known window method with an asymmetric window extracted from optimal filter designed beforehand. As we will demonstrate, such an approach, if additional gain correction is applied, allows for nearly optimal VFD filter design. Thus, the proposed approach combines window method simplicity with performance comparable to that of optimal filters. Efficiency of the presented technique makes it suitable for designing filters with varying delay in real time
Źródło:
International Journal of Electronics and Telecommunications; 2011, 57, 4; 465-472
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance of Limestone as a Multi-Media Filter for Manganese Removal from Groundwater
Autorzy:
Ahmedi, Figene
Thaqi, Premton
Tosuni, Kaltrina
Powiązania:
https://bibliotekanauki.pl/articles/24202897.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
limestone
manganese
multi-media filter
single-media filter
Opis:
According to Council Directive 98/83/EC on the quality of water intended for human consumption, concentration of the manganese in the drinking water should not exceed 0.05 mg/l. However, this level of manganese concentration is higher ingroundwaterof a community (Vitia town) in Kosovo. Groundwater is used for drinking supply of some villages and is only chlorified continuing to the reservoir from where is gravitationallydisseminated to the villages. The manganese level of the water is at the range 0.3 to 0.6 mg/l. Limestone has been provenby many researchers to be a very effective filter material in manganese removal for groundwater.A miniature filtration unit was modeled to investigate the removal efficiency of manganese.The unit consists of local limestone, where a single materialis folded in three layers of different grainsizes. In fact, the aim of this paper was to assess whether limestone as a single material acting as a "multi-media filter" can reduce the manganese concentration in groundwater. On the basis of the analysis of the single snapshot sample,the removal of manganese achieved more than 95% in filtered water. Particularly, this study demonstrates that filtering the water through three layers of different grain sizes of limestone ("multi-media limestone filter") can be a good alternative for manganese removal in groundwater.
Źródło:
Journal of Ecological Engineering; 2023, 24, 6; 385--391
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The algorithm of adaptive determination of amplification of the PD filter estimating object state on the basis of signal measurable on-line
Autorzy:
Kwater, Tadeusz
Hawro, Przemysław
Bartman, Jacek
Mazur, Damian
Powiązania:
https://bibliotekanauki.pl/articles/1409165.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
estimation
Kalman filter
adaptive PD filter
filter amplification
Opis:
The article presents the algorithm that enables adaptive determination of the amplification coefficient in the filter equation provided by Kalman. The method makes use of an estimation error, which was defined for this purpose, and its derivative to determine the direction of correction changes of the gain vector. This eliminates the necessity to solve Riccati equation, which causes reduction of the method computational complexity. The experimental studies carried out using the proposed approach relate to the estimation of state coordinates describing river pollution using the BOD (biochemical oxygen demand) and DO (dissolved oxygen) indicators).The acquired results indicate that the suggested method does better estimations than the Kalman filter. Two indicators were used to measure the quality of estimates: the Root Mean Squared Error (RMSE) and the Mean Percentage Error (MPE).
Źródło:
Archives of Control Sciences; 2021, 31, 1; 129-143
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Jak Facebook zamyka nas w bańce informacyjnej. Algorytm filtrujący newsfeed a zjawisko filter bubble
How does Facebook traps us in a bubble. The Facebook’s content filter algorithm vs filter bubble effect
Autorzy:
Malinowski, Bartosz
Powiązania:
https://bibliotekanauki.pl/articles/1052687.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
Facebook
social media
filter bubble
Opis:
The aim of the article is to analyze the relations between the Facebook’s content filter algorithm system and the filter bubble effect – a digital bubble that surrounds a user with personalized content and information, also isolating him from the information that does not fir his viewpoint. The Facebook’s content filter algorithm – also known as EdgeRank – is controversial due to its mechanism that prevents certain amount of information from reaching user. This invisible selection system might significantly affect the way we perceive the world – it traps us in a peculiar information bubble. The presented conclusions are to help in understanding the way the EdgeRank works, how it results in creating filter bubbles and what are the main threats being posed by it as well as the methods of reducing its negative effects. The article is divided into five chapters: 1. Facebook as a source of information. 2. The Facebook’s content filter algorithm. 3. Filter bubble in theory and in reality. 4. The consequences of being trapped in a information bubble. 5. How to reduce the negative effects of filter bubble?
Źródło:
Zarządzanie Mediami; 2016, 4, 1; 15-22
2353-5938
Pojawia się w:
Zarządzanie Mediami
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative analysis of dynamic properties of parametric and fractional-order filters
Autorzy:
Jakubowska-Ciszek, Agnieszka
Piwowar, Anna
Powiązania:
https://bibliotekanauki.pl/articles/377115.pdf
Data publikacji:
2019
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
parametric filter
fractional-order filter
filter dynamic models
LTV filters
dynamic properties
Opis:
The paper presents transmission models of a parametric filter with non-periodically variable parameters and a fractional-order filter. The responses of these filters on a unit step excitation have been examined as well as the dependence of filters time responses on their parameters. The obtained results have been illustrated by examples.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2019, 97; 133-142
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design of a Dual-Band Rectangular Waveguide Filter based on Direct Coupled
Autorzy:
Slimane, Gouni
Mehdi, Damou
Mohammed, Chetioui
Abdelhakim, Boudkhil
Powiązania:
https://bibliotekanauki.pl/articles/2124748.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
simulation
waveguide filter
HFSS
bandpass filter
direct coupling
Opis:
This paper presents how to design and simulate a passband rectangular waveguide filters based on direct coupled resonators operating at 12 GHz. The modeled filters are characterized by a cross coupling that produces a single attenuation pole at finite frequency used to shape the bandpass response. Resonators provide bandpass filter designs with a pseudo-elliptic response using HFSS simulators. Transmission zeros are obtained through coupling between the fundamental mode and high mode. The filter structures are validated leading to obtain transmission zeros close to the passband. The simulated waveguide filters with a centre frequency exhibit an insertion loss of -0.4/0.3dB and a return loss of −20/23dB for a bandwidth ranging from 11.85GHz to 12.15GHz that shows good electromagnetic responses for the simulated filters.
Źródło:
International Journal of Electronics and Telecommunications; 2022, 68, 3; 483--488
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Power system stability with parallel active filter ensuring compensation of capacitive reactive power of a resonant LC circuit
Autorzy:
Płatek, T.
Powiązania:
https://bibliotekanauki.pl/articles/201301.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
parallel active filter
passive filter
system stability analysis
Opis:
This paper presents an analysis allowing for the determination of the differential equation describing the circuit of the active filter inverter output current control with an additional measurement of input voltage. The resulting equation allows to determine the conditions that ensure stable operation of the filter with the load in form of a resonant LC circuit. Analysis results were confirmed by computer simulation and experimental studies of commercial active filter.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 2; 353-361
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of a selectable multi-passband microwave photonic filter based on cascaded optical comb filters
Autorzy:
Wang, F.
Peng, M. M.
Powiązania:
https://bibliotekanauki.pl/articles/2033940.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
microwave photonic filter
multi-passband filter
microwave signal processing
Opis:
A multi-passband microwave photonic filter (MPF) with selectable passband frequency, spanning 0-20 GHz frequency range, is proposed, and experimentally demonstrated, in which passband frequency can be flexibly selected within a maximum passband number to four. The scheme is based on the generation of tunable optical comb lines using a broadband optical source sliced by cascaded optical comb filters, achieved by connecting an in-line birefringence fiber filter and a reconfigurable Lyot filter in series, such that various filter tap spacing and spectral combinations are obtained for the configuration of the MPF. The proposed MPF can operate with four different passband states, namely, single-, dual-, triple-, and quadruple-passband, only by adjusting polarization states of the cascaded optical comb filters. All these passbands are with a 3-dB bandwidth varying from 200 to 460 MHz and more than 20-dB sidelobe suppression.
Źródło:
Optica Applicata; 2021, 51, 3; 457-467
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design and Optimization of Rectangular Waveguide Filter based on Direct Coupled Resonators
Autorzy:
Damou, M.
Nouri, K.
Feham, M.
Chetioui, M.
Powiązania:
https://bibliotekanauki.pl/articles/963863.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
coupling matrix
filter
waveguide
technology
electromagnetic
band-pass filter
Opis:
The waveguide filter structure is treated by two softwares (HFSS (High Frequency Structure Simulator) and CST (Computer Simulation Technology)). Numerical example is given in this article to demonstrate, step by step, the application of the approach to the design of resonator, direct coupled waveguide and microstrip filters based on electromagnetic (EM) simulations. For this design procedure, the filter structure is simulated by successively adding one resonator at a time. To continue the work illustrates how to design a fourth order coupled resonator based rectangular waveguide circuit in the traditional way. With a large number of variables, such tuning work consumes a lot of time and the convergence of the final result is not guaranteed. A fourth order X-band bandpass filter with a center frequency of 11 GHz and a fractional bandwidth FBW = 0,0273 is designed using this procedure and presented here as an example. The simulated results by CST are presented and compared withthe results simulated by a high-frequency structure simulator. Good agreement between the simulated HFSSand simulated results by CST is observed.
Źródło:
International Journal of Electronics and Telecommunications; 2017, 63, 4; 375-380
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-25 z 997

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