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Wyszukujesz frazę "Dzunda, M." wg kryterium: Autor

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    Wyświetlanie 1-12 z 12
    Tytuł:
    Accuracy of Relative Navigation in Automated Systems of Data Communication
    Autorzy:
    Dzunda, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/116977.pdf
    Data publikacji:
    2008
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Accuracy
    Automated Systems
    Relative Navigation
    Data Communication
    Air Navigation
    Flying Object
    positioning system
    Wide-Band Synchronous Automated Systems of Data Communication (ASDC)
    Opis:
    The architecture of wide-band synchronous automated systems of data communication (ASDC) enables utilization of high accuracy measurement of the signal reception times to relative navigation in the network. In this contribution an operation analysis of such systems in the relative navigation mode is conducted. The accuracy and possibilities of the utilization of these systems were examined by modeling in air navigation.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2008, 2, 2; 161-163
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Impact of Windmills on the Operation of Radar Systems
    Autorzy:
    Dzunda, M.
    Humenansky, V.
    Draxler, D.
    Csefalvay, Z.
    Bajusz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/117642.pdf
    Data publikacji:
    2009
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    radar
    Windmill
    Radar System
    Radar Equipment
    Wind Power Station
    Radiolocation System (RLS)
    Radiolocation
    Terminal Control Area (TMA)
    Opis:
    The contribution provides solutions to the impact of planned building of windmills exerted on the operation of radar equipment. The major negative factors involved have been determined and considered as to how the planned building of wind power stations influences the operation of radar systems developing a procedure of evaluating their effects.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2009, 3, 3; 315-317
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Imaging of Magnetic Domain Structure in $FeSi/Mn_{0.8}Zn_{0.2}Fe_2O_4$ Composite using Magnetic Force Microscopy
    Autorzy:
    Streckova, M.
    Batko, I.
    Batkova, M.
    Bures, R.
    Faberova, M.
    Dzunda, R.
    Hadraba, H.
    Kubena, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398262.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.80.Tm
    75.50.Bb
    75.60.-d
    81.20.-n
    81.20.Ev
    81.20.Fw
    Opis:
    Soft magnetic composite was prepared by coating the commercial FeSi powder by $Mn_{0.8}Zn_{0.2}Fe_2O_4$ (MnZn) ferrite, which serves as a potential dielectric phase. MnZn ferrite was prepared by the sol-gel method followed by the auto-self combustion process. The spinel structure of MnZn ferrite was analyzed by X-ray diffraction technique. The composite material was prepared by uniaxial compaction technique and sintered either by conventional or unconventional microwave method. The microwave sintering was applied in order to reduce a grain growth and decrease the overall sintering time. The microstructure of FeSi powder is formed by grains of different diameter. Magnetic force microscopy and scanning electron microscopy were used for an investigation of the correlation between the grain size, grain boundaries and magnetic domains. Magnetic force microscopy visualization of magnetic domains in the prepared soft magnetic composite brings insight into how the magnetically active coating (MnZn ferrite) influences the soft magnetic (FeSi) powder under the influence of the external magnetic field.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 714-716
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Fiber Laser Pulse Processing on Coercivity and Nanohardness of Fe-3.2Si Grain-Oriented Electrical Steel in relation with its Surface Changes and Magnetic Domains Modifications
    Autorzy:
    Puchý, V.
    Falat, L.
    Kováč, F.
    Petryshynets, I.
    Džunda, R.
    Šebek, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032305.pdf
    Data publikacji:
    2017-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.80.Ba
    81.05.Bx
    81.40.Rs
    81.40.-z
    75.60.Ch
    79.20.Eb
    Opis:
    Fiber laser scribing of Fe-3.2Si grain-oriented electrical steel was carried out using three different laser pulse regimes, namely a single pulse laser regime, multipulse laser regime and multipulse laser regime with modulation of laser pulses. The samples were tested for coercivity and nanohardness before and after laser processing. Clear improvements in soft magnetic characteristics were observed for all the regimes using the lowest single pulse energy of 0.6 mJ. The best improvement i.e. the most significant decrease in coercivity was obtained after the regime with 5 pulses. Further increasing in both pulse energy and pulse number resulted only in detrimental effects on both magnetic and mechanical characteristics. Introduction of 50 kHz pulse modulation within 100-pulse laser regimes resulted in lower coercivity values in comparison with the same regimes without modulation. The major effects responsible for the observed improvement are related to optimal refinement and rearrangement of magnetic domains determined by the balance of laser-induced residual stresses and plastic deformation at the surface of the treated material. Thus the fiber laser pulse processing has been recognised as a useful and energy efficient tool in obtaining electrical steels for power transformers with lower core losses.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 6; 1445-1449
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Protection against high-frequency radiation of aviation electronic support systems used in air transport
    Autorzy:
    Dzunda, M.
    Cekanova, D.
    Cobirka, L.
    Zak, P.
    Dzurovcin, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/116582.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    air transport
    aviation electronic support systems
    high-frequency radiation
    radiation
    electromagnetic radiation
    arport radars
    air electronic safety technology
    radar electric field
    Opis:
    The aim of the article is to analyze the impact of electromagnetic radiation of aviation electronic support systems on environmental segments and a human organism. We were looking for effects of electromagnetic radiation on inhabitants and environment in the vicinity of airport radars. We accomplished measuring and found out the level of radiation harmfulness of electromagnetic radiation sources. In the conclusion we suggest to eliminate the negative impact of electromagnetic radiation on the human organism. At the same time we present the ways how workers, performing their jobs in the vicinity of strong electromagnetic radiation source, can protect themselves in compliance with legislative of the Slovak Republic. We have proposed some possibilities of protection for workers who work close to a strong source of electromagnetic radiation.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 1; 183-186
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of flying objects position
    Autorzy:
    Dzunda, M.
    Dzurovcin, P.
    Melniková, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/116434.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Electronic Chart Systems
    flying objects (FO)
    flying objects position
    Matlab
    non-flying objects
    positioning
    Global Navigation Satellite System (GNSS)
    dilution of precision (DOP)
    Opis:
    This paper describes various methods of flying object positioning with the emphasis on their accuracy. Based on the accomplished analysis, we will select the most appropriate method to determine the position of a flying object for relative navigation purposes. The primary criterion for choosing a positioning method is the accuracy of distance measurement within users working in the aviation communications network. The results presented in the paper have been based on mathematical modelling and computer simulation performed in the Matlab programming environment. The results obtained can be used to navigate flying or non-flying objects that work in the air communications network.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2019, 13, 2; 423-428
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of mutual position of communication network users on accuracy of positioning by telemetry method
    Autorzy:
    Džunda, M.
    Dzurovčin, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1841445.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    e-Navigation
    mutual position
    telemetry method
    Matlab
    accuracy of position
    communication networks
    Opis:
    In this paper we solve the problem of the influence of the mutual position of the users of the communication network on the accuracy of the telemetric navigation system. We present the principle of operation of a telemetry navigation system and examine the accuracy of determining the position of users of the communication network depending on their mutual position. The telemetric method of determining the position of users of a communication network can be used in shipping or air transport. The simulation of the telemetry system will be performed in the Matlab software environment.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2021, 15, 2; 299-306
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model of the Motion of a Navigation Object in a Geocentric Coordinate System
    Autorzy:
    Džunda, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2063984.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    earth-centered
    earth-fixed
    Matlab
    model of the motion
    navigation object
    geocentric coordinate system
    air navigation
    flight trajectory
    flying objects
    Opis:
    In this paper we describe the creation of a model of the motion of a flying object in a geocentric coordinate system (ECEF - Earth-Centered, Earth-Fixed). Such a model can be used to investigate the accuracy and resistance of radio navigation systems to interference. The essence of the design of the model lies in the mathematical description of the motion of a flying object in a geocentric coordinate system. The flight trajectory of a flying object consists of one straight section and two turns. When creating a model, we assume a flight at a constant altitude. In this paper, we present one of the possible procedures for modelling the motion of a flying object in a geocentric coordinate system. We chose the initial coordinates of the flying object according to flightradar 24. We used the Matlab software for computer simulation.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2021, 15, 3; 791--794
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model of the random phase of signal E6 of the Galileo Satellite Navigation System
    Autorzy:
    Džunda, M.
    Čikovský, S.
    Melniková, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/24201441.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    model
    simulation
    random phase
    signal E6
    satellite navigation system
    Galileo
    random phase model
    useful signal
    Opis:
    The aim of this paper was to describe the random phase of the E6 signal, the Galileo satellite navigation system. Based on the available information, mathematical models of the measurement signals of the Galileo system were created. The frequencies of individual signals were determined and their structure visualized. A block diagram of the generation of individual signals is also shown. The main contribution of the paper is the creation of a random phase model of the E6 signal from the Galileo system. In accordance with the technical data of the Galileo system, the parameters of the random phase model were determined. The simulation results confirmed that the frequency instability of the continuous signal E6 n received from the satellite is a stationary process. The short-term stability of the frequency ranges from 10-13 to 10-14. The simulation results confirmed that the Doppler effect significantly affects the random phase of the E6 signal. This phenomenon can affect the results of navigation measurements using the E6 signal. The modeling and simulation results of the random phase of the E6 signal presented in the paper can be used to evaluate the immunity of the Galileo navigation system to interference.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 1; 61--68
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model of the signal of the Galileo Satellite Navigation System
    Autorzy:
    Džunda, M.
    Čikovský, S.
    Melniková, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/24201440.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    Global Navigation Satellite System
    navigation system
    Galileo
    E1 signal
    interference
    chaotic impulse interference
    narrowband interference
    simulation method
    Opis:
    This article presents an analysis of the Galileo E1 signal and its sensitivity to different types of interference. The research involved modeling white noise, chaotic impulse interference, and narrowband interference and the effects of these interfering signals on the E1 signal. Based on the available information, spectral structures were created for the mentioned types of interference, and subsequently, these interferences were integrated into the E1 signal in the Matlab program environment. A Kallman filter was used to filter out white noise from the additive mixture of the E1 signal and white noise. The research aimed to analyze the influence of white noise, chaotic impulse interference, and narrowband interference on the spectral power density of the E1 signal. The results of this work can be used in the design of robust receivers and signal structures capable of withstanding these types of interference.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 1; 51--59
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selected aspects of sudent education in the field of air transport
    Autorzy:
    Džunda, M.
    Melniková, L.
    Dzurovčin, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/24201427.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    air transport
    teaching-learning process
    professional aviation subjects
    aviation personnel
    the teacher
    the student
    ddactics
    the teaching
    Opis:
    In this paper, the issue of teaching professional aviation subjects in the field of higher education air transport was ad‐dressed. We present some research results in the field of didactics of professional aviation subjects, teaching effectiveness, motivation and evaluation of students in education. In this work we present some approaches to the development of didactics of professional subjects in Slovakia. We state that the subject of didactics is the student, teacher and knowledge forming the didactic tri‐angle. Didactics of professional subjects examines the possibilities of transforming the knowledge of technical scientific disciplines into the content of education, didactic systems, teaching projects and the studentʹs knowledge. We researched the area of didactics of professional aviation subjects with a focus on motivating students to study. We managed to involve a large sample of students in the research, which helped us in‐crease the objectivity of the results. Based on the research results, we recommend some measures to increase the quality of higher education of students in the field of air transport. The motivating goal for our research is to support the quality of education at the Faculty of Aeronautics of the Technical University of Košice.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 3; 653--664
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The navigation infrastructure of airports and new trends in ATM
    Autorzy:
    Džunda, M.
    Gédrová, N.
    Melniková, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/24201428.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    costs of transport
    airport
    navigation Infrastructure
    navigation systems
    satelite navigation systems
    air traffic control
    revenues
    ILS
    Opis:
    Aim of publication is to introduce reader with general need and current situation of development of air traffic management systems and evaluation of actual operating network of aviation electronic support systems. The theme of the contribution is actual because there is currently an increase in the volume of the air traffic, which places increased demands on the safety level of air transport. Attempting to find new answers related to insufficient navigation systems has led aviation authorities to develop progressive systems based on cooperation with satellite navigation systems. Solution for capacity limited airports is development of system GBAS – Ground Based Augmentation System. The main purpose of publication is to present drafts of possible rationalization of navigation infrastructure of M.R. Stefanik airport. The effort to use the maximum potential of airspace consisted in the search for new concepts and trends in air traffic management based on the development of the technical pillar and new ways of managing the entire ATM system.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 3; 665--671
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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