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    Wyświetlanie 1-9 z 9
    Tytuł:
    Influence of a real radio channel parameters on the quality of the OFDM signal in mobile applications. Estimation of parameters of the channel as an element of improvement of the transmission quality
    Autorzy:
    Bożek, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/385028.pdf
    Data publikacji:
    2007
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    OFDM
    radio transmission
    multi-path
    radio channel estimation
    Opis:
    The article deals with issues related to transmission of a signal with the OFDM multitude modulation in a real radio channel. Following short characteristics of the OFDM modulation, the article includes an analysis of typical radio channels from the angle of amplitude and phase on the basis of delay profiles referred to in the literature. The study contains results of simulated receipt of the OFDM signal in the multi-path conditions. On the basis of diagrams of constellation of the modulation symbols, the author presented differences in the quality of the signal before and after the phase correction and improvement in the quality due to application of cyclic prefix. Influence of noise as well as the fact that the terminals are non-stationary on operation of the frequency characteristics estimation algorithm was analyzed. At the end, an example was presented of application of a linear model of estimation of phase characteristics of a channel with the shift in frequency occurring in mobile systems as a consequence of the Doppler effect being compensated.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2007, 1, 3; 64-68
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A wireless data acquisition and processing system
    Autorzy:
    Matuszewski, Ł.
    Woźniak, W.
    Stołowski, P.
    Jessa, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/114722.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    metrology
    wireless sensor network
    microcomputers
    radio transmission
    Opis:
    The paper describes an idea and realization of a system for collecting and processing data from different types of wireless distributed sensors. The system consists of wireless sensor networks. Each network consists of a server connected to the Internet and theoretically unlimited number of clients. The described server has been built with two types of microcomputers. It provides tools for data collecting and processing. A client, described in Section 5, can be implemented on any PC (Personal Computer) with Windows or Linux including the Raspberry PI and any other microcomputer with HDMI joint. It allows providing an interactive signboard. The data coming from a wireless measuring unit is stored in the server. Two versions of the measuring unit (Section 6) were developed. They differ in wireless modules (compared in Section 2). The first solution uses XBee-PRO 868. The second one uses CC-2530 working in ISM 2.4GHz band. The coverage comparison of both solutions is presented in Section 7. The system can be adjusted to measure any environmental value starting with temperature, humidity and ending with more advanced like the chemical composition of air. There is also included comparison with existing commercial solutions.
    Źródło:
    Measurement Automation Monitoring; 2015, 61, 7; 330-332
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Measurement data acquisition system with mobile server
    Autorzy:
    Matuszewski, Ł.
    Woźniak, W.
    Stołowski, P.
    Jessa, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/114426.pdf
    Data publikacji:
    2017
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    metrology
    wireless sensor network
    radio transmission
    water meter
    Opis:
    The paper describes an idea and the realization of a remote reading water meters system with wireless pictures transmission to the mobile server. The system consists of various water meters with installed electronic devices for measurement capturing. The measurements are read by taking a picture of the analog number indicators from the front panel. The pictures are send wirelessly to the mobile server which stores them until the acknowledgement from the main server is received. The mobile server is constructed of the microcomputer Raspberry Pi 3 connected with the XBee_PRO through adapter. The pictures transmission from the mobile server to the main server is realized by the Internet connection. The main server application allows recognizing the numbers from received pictures. The measurement data is available as digital numbers in a data base of the main server. The designed system is dedicated to the work in a low population density area.
    Źródło:
    Measurement Automation Monitoring; 2017, 63, 5; 174-176
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Future generation of railway control systems for regional lines including new telematic solutions
    Autorzy:
    Lewiński, A.
    Łukasik, Z.
    Perzyński, T.
    Ukleja, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/393693.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Stowarzyszenie Telematyki Transportu
    Tematy:
    regional lines
    control system
    telematics
    open radio transmission
    efficiency
    safety
    Markov process
    time analysis
    probability analysis
    linie regionalne
    system sterowania
    telematyka
    otwarta transmisja bezprzewodowa
    wydajność
    proces Markova
    analiza czasowa
    analiza prawdopodobieństwa
    Opis:
    The paper deals with implementation problem of new generation of railway control and management systems dedicated for regional lines. The special infrastructure of such lines gives the possibility of application the new telematic technologies including the open radio transmission standards to control and monitoring the dissipated railway objects. In the paper the efficiency and safety analyses are presented based on stochastic process approach according to UE standards and recommendations.
    Źródło:
    Archives of Transport System Telematics; 2014, 7, 3; 13-16
    1899-8208
    Pojawia się w:
    Archives of Transport System Telematics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Intimate listening and sonic solidarity. Radio in the works of Radio Earth Hold collective as a way towards the sonic turn
    Autorzy:
    Wódz, Marta
    Powiązania:
    https://bibliotekanauki.pl/articles/1788541.pdf
    Data publikacji:
    2021-05-27
    Wydawca:
    Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego
    Tematy:
    radio
    Radio Earth Hold
    transmission art
    sonic turn
    sonic solidarity
    natural radio
    Opis:
    At first glance, radio may seem to be an example of dated technology, overturned by other, more contemporary media. However, the beginning of the 21st century brought an upsurge of radio-related artworks alongside an increased theoretical interest around the broader topic of sound in culture – in response to W. J. T Mitchell’s ‘pictorial turn,’ the ‘sonic turn’ was introduced in 2004 by Jim Drobnick. In this article, I specifically focus on radio as a tool used in visual arts on the example of works by artistic/curatorial collective Radio Earth Hold, observed through the lens of ‘transmission arts’ – a term coined at the end of the 1990s, which recognizes the issue of transmission as political at its core. REH’s works render apparent the potential of the radio voice to become authoritarian as well as to create an intimate experience of listening. By building upon the idea of ‘sonic solidarity’ REH touches upon political topics in a way that can profoundly challenge our thinking and encourage us to reexamine not only the role of radio but also the transmission and communication in or via art – which perhaps could be understood as a way towards the possible sonic turn.
    Źródło:
    Ikonotheka; 2020, 30; 191-207
    0860-5769
    Pojawia się w:
    Ikonotheka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on quality requirements of data transmission services in RSMAD
    Autorzy:
    Gajewska, M.
    Gajewski, S.
    Sokół, M.
    Staszkiewicz, L.
    Brewka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/393908.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Stowarzyszenie Telematyki Transportu
    Tematy:
    transmisja danych
    monitoring radiowy
    transmission data
    radio system monitoring
    Opis:
    The paper presents results and analysis of research of the quality of service requirements (defined by the QoS attributes) for imaging data transmission services using Radio System for Monitoring and Acquisition of Data from Traffic Enforcement Cameras (in short RSMAD). The paper also presents and discusses results of test on the impact of the size of photos from traffic enforcement cameras on the average transmission time. These tests were conducted under conditions of actual operation of the RSMAD system. Basing on the obtained results, an analysis of the capacity, to provide in the RSMAD system required quality of service by different wireless data transmission systems, was performed.
    Źródło:
    Archives of Transport System Telematics; 2011, 4, 1; 43-48
    1899-8208
    Pojawia się w:
    Archives of Transport System Telematics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radio planning and transmission network design of GSM-R system for the railway line
    Autorzy:
    Gruba, Ł.
    Siergiejczyk, M.
    Kochan, A.
    Gago, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/393559.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Stowarzyszenie Telematyki Transportu
    Tematy:
    ERTMS
    GSM-R
    radio planning
    transmission network
    planowanie radiowe
    sieć transmisyjna
    Opis:
    One of the biggest projects aimed at integration of the infrastructure of the European Union is the implementation of the European Rail Traffic Management System on the railway network of the Member States. Its goal is to unify the railway traffic control system in European countries, increase safety as well as ensure the interoperability of rail transport. One of its main components is ERTMS/GSM-R subsystem. This article presents the structure of the GSM-R system as well as associated systems. Services offered by the system are discussed. The rules of planning radio networks including the propagation model are described. The final part of the paper contains an example of radio planning for GSM-R system for selected railway line covering computations as well as simulation tests. The simulation of the radio coverage was prepared with the usage of ICS Telecom software.
    Źródło:
    Archives of Transport System Telematics; 2017, 10, 2; 3-7
    1899-8208
    Pojawia się w:
    Archives of Transport System Telematics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Transmission Quality Measurements in DAB+ Broadcast System
    Autorzy:
    Gilski, P.
    Stefański, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/221313.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    broadcast technology
    Digital Audio Broadcasting
    Quality of Service
    transmission quality
    radio communication
    Opis:
    In the age of digital media, delivering broadcast content to customers at an acceptable level of quality is one of the most challenging tasks. The most important factor is the efficient use of available resources, including bandwidth. An appropriate way of managing the digital multiplex is essential for both the economic and technical issues. In this paper we describe transmission quality measurements in the DAB+ broadcast system. We provide a methodology for analysing parameters and factors related with the efficiency and reliability of a digital radio link. We describe a laboratory stand that can be used for transmission quality assessment on a regional and national level.
    Źródło:
    Metrology and Measurement Systems; 2017, 24, 4; 675-683
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Key Management System in ETCS
    Autorzy:
    Franekova, M.
    Chrtiansky, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/393513.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Stowarzyszenie Telematyki Transportu
    Tematy:
    radiokomunikacja ruchoma
    otwarty system transmisji
    GSM-R
    KMS
    zarządzanie
    mobile communications
    open transmission system
    key management system
    radio block centre
    key management centre
    on board unit
    brute force attack
    birthday paradox
    Opis:
    Paper deals with problems of KMS (Key Management System), which is developed in mobile communications GSM-R (Global System Mobile for Railway) recommended within the European Train Control System (ETCS), through the Euroradio system. Th e main part is oriented to safety procedures description of off-line KMS system between communication entities of ETCS system. In the experimental part the results of computational safety of modifi ed DES algorithm are summarised using special brute force attack to key – birthday paradox.
    Źródło:
    Archives of Transport System Telematics; 2009, 2, 1; 12-16
    1899-8208
    Pojawia się w:
    Archives of Transport System Telematics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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