Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "radio," wg kryterium: Temat

  Lista filtrów
Wyrównaj
Wyświetlanie 1-15 z 49
Tytuł:
Survey of Radio Navigation Systems
Autorzy:
Gilski, P.
Stefański, J.
Powiązania:
https://bibliotekanauki.pl/articles/227025.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
radio navigation
radio communication
satellite navigation systems
radiofrequency identification
Opis:
At present, there is a growing demand for radio navigation systems, ranging from pedestrian navigation to consumer behavior analysis. These systems have been successfully used in many applications and have become very popular in recent years. In this paper we present a review of selected wireless positioning solutions operating in both indoor and outdoor environments. We describe different positioning techniques, methods, systems, as well as information processing mechanisms.
Źródło:
International Journal of Electronics and Telecommunications; 2015, 61, 1; 43-48
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Broadband Input Block of Radio Receiver for Software-Defined Radio Devices
Autorzy:
Magnuski, M.
Surma, M.
Wójcik, D.
Powiązania:
https://bibliotekanauki.pl/articles/225973.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
software defined radio
radio receiver
broadband
antenna
tuned filter
Opis:
In the paper a cost-effective input block of the SDR receiver for 0.9 - 2.4GHz frequency band built of capacitivetuned selective amplifier and broadband Vivaldi antenna is presented. The applied selective amplifier consists of three identical sections of tunable filters and two stages of monolithic broadband amplifiers. The single filter section proposed by the authors, due to its ability to absorb parasitic inductances of varicap diodes, simplifies usage of encapsulated varicap diodes in design of tunable in broad band selective filters dedicated to input stages of the receivers. Moreover, proposed filter section has small variation of in-band insertion loss in comparison to varicap-tuned filters built of coupled transmission lines which are commonly applied in input blocks of the microwave receivers. The described selective amplifier could be easily integrated on a single substrate with the Vivaldi antenna which is a cost effective way of fabrication of the tunable in broad band input block of a receiver that has desired gain, selectivity and directivity of the antenna.
Źródło:
International Journal of Electronics and Telecommunications; 2014, 60, 3; 233-238
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radio Environment Map for the Cognitive Radio Network Simulator
Autorzy:
Bednarek, P.
Bicki, D.
Lopatka, J.
Powiązania:
https://bibliotekanauki.pl/articles/226843.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cognitive radio
Radio Environment Maps
REM database
G-REM
L-REM
Opis:
Military wireless tactical systems has faced the problem of limited spectrum resources. This is a reason why Cognitive Radio (CR) is one of the most popular topic studied by research institutes in the field of mobile telecommunications. CR technology is based on cognitive cycle, used for making decisions based on observation and orientation. To support this activity, radios need also information on current position, electromagnetic situation, legal issues etc. These functions can be provided by Radio Environment Map (REM) database. It enables more flexible spectrum utilization and coexistence of Primary and Secondary Users (PUs, SUs) without harmful interferences. This paper presents a proposal of REM database structure and graphical user interface (GUI). It also describes GUI implementation in MATLAB and data structure. Database was implemented using the database engine - SQLite. The proposed REM database is a part of cognitive radio network simulator developed in the Institute of Telecommunications.
Źródło:
International Journal of Electronics and Telecommunications; 2018, 64, 1; 45-49
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trunked Radio Solutions for Special Applications
Autorzy:
Gajewski, S.
Gajewska, M.
Katulski, R. J.
Powiązania:
https://bibliotekanauki.pl/articles/226766.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
LTE
trunked radio
TETRA
DMR
Opis:
In the paper modern concepts of radio communication trunking-dispatch systems for special applications are presented. Basic standards of TETRA, DMR, and cdma2000 are mentioned. The aim of the paper is to present innovative trunking solutions based on the LTE system working both in FDD and TDD mode. The architecture of LTE trunked radio is shown as well as new services possible to implementation are described. The way of TETRA and LTE integration is characterized.
Źródło:
International Journal of Electronics and Telecommunications; 2014, 60, 4; 309-314
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Novel Tracing Algorithm vs Remcom Wireless InSite
Autorzy:
Gotszald, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/963894.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Ray Tracing
radio wave propagation modelling
Opis:
Results of comparison between a popular commercial software for radio wave propagation modeling versus prototype implementation of a novel algorithm proposed by the author of this paper is discussed. It is shown that both algorithms lead to very similar results while the new one is faster by a few orders of magnitude.
Źródło:
International Journal of Electronics and Telecommunications; 2015, 61, 3; 273-279
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
90 lat Polskiego Radia
Ninety years of the Polish Radio
Autorzy:
Myśliński, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/421731.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
radiofonia
Polskie Radio
historia polskiej radiofonii
Opis:
W formie na poły felietonowej autor snuje refleksje nasuwające się w związkuz 90. rocznicą powstania publicznej radiofoniiw Polsce. Przy okazji wspomina o swoichwrażeniach z obcowania z odbiornikamii programem Polskiego Radia od końcalat trzydziestych XX wieku.
In a personal contribution to markthe 90th anniversary of the Polish Radio,Poland’s public broadcaster,the author reminisces about his experienceswith receivers and programmessince the early days of radioin the late nineteen thirties
Źródło:
Rocznik Historii Prasy Polskiej; 2015, 18, 4(40); 103-111
1509-1074
Pojawia się w:
Rocznik Historii Prasy Polskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Multichannel Receiver of the Experimental FM Based Passive Radar Using Software Defined Radio Technology
Autorzy:
Szlachetko, B.
Lewandowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/226436.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
SDR
passive radar
GNU Radio
USRP
Opis:
In this paper we present results of research on multichannel receiver using Software Defined Radio technology. This receiver is a part of the experimental FM based passive radar being designed. The hardware platform of the receiver consists of the Universal Software Defined Radio Peripheral devices. In the paper we propose modifications of the USRP's FPGA configuration and GNU Radio code. These modifications allow for developing six/nine synchronous input channel receiver based on two/tree USRPs respectively. Issues of synchronization of separate USRP devices by assuring synchronous sampling were presented. We also propose the solution of the problem of the alignment of the data streams being sent from USRP devices via USB to the PC host.
Źródło:
International Journal of Electronics and Telecommunications; 2012, 58, 4; 301-306
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cryptographic Protection for Military Radio Communications
Autorzy:
Białas, Robert
Grzonkowski, Marcin
Wicik, Robert
Powiązania:
https://bibliotekanauki.pl/articles/1844479.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cryptography
cryptanalysis
radio communication
quantum computers
Opis:
Protecting the confidentiality, integrity and availability of information is very important in any telecommunications system. Information protection requires use of necessary physical, personal, information and communication technologies and above all – electromagnetic and cryptographic security measures. Equipment and tools for cryptographic protection should be examined and assessed in terms of resistance to known threats. Additional requirements are put on information protection for radio communication, especially military, where radio transmission is characterized by uncertainty of establishing and maintaining connections, bit rates are relatively low, often without full duplex. All this has an impact on the methods of cryptographic synchronization and implementation of cryptographic functions. A different approach to information protection is required by classic narrowband radio communications, a different one in time-division multi-access modes, and another one in broadband packet data transmission. Systems designed for information protection in radio communications implement appropriate operating modes of operation for cryptographic algorithms and protocols. Latest threats from quantum computers pose new challenges, especially in systems using public-key cryptography, because there are algorithms that can be used to attack these schemes with polynomial complexity.
Źródło:
International Journal of Electronics and Telecommunications; 2020, 66, 4; 687-693
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radio link measurement methodology for location service applications
Autorzy:
Stefanski, J.
Powiązania:
https://bibliotekanauki.pl/articles/220635.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
radio link measurements
location service
radiolocation
radionavigation
Opis:
The aim of this paper is the methodology of measurements executed in a radio link for the realization of radiolocation services in radiocommunication networks, particularly in cellular networks. The main results of the measurements obtained in the physical layer of the universal mobile telecommunications system (UMTS) are introduced. A new method for the utilization of the multipath propagation phenomenon to improve the estimation of the distance between the mobile station (MS) and the base station (BS) is outlined. This method significantly increases the quality of location services in systems which use a radio interface with direct sequence code division multiple access (DS CDMA).
Źródło:
Metrology and Measurement Systems; 2012, 19, 2; 333-342
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Statistical Estimation and Mathematical Modelling of Tropospheric Radio Refractivity Based on Meteorological Data
Autorzy:
Alimgeer, K. S.
Awais, M.
Ijaz, B.
Khan, S. A.
Subhan, F.
Ahmad, N.
Powiązania:
https://bibliotekanauki.pl/articles/221069.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
radio refractivity
statistical estimation
ITU
mathematical modelling
Opis:
To obtain optimal performance, estimation of radio refractivity is essential in planning and design of radio links/systems. The dependence of radio refractivity on different climatic parameters such as temperature, pressure, humidity and scale height is studied. The method proposed by International Telecommunication Union (ITU) is used in calculation of tropospheric radio refractivity. The main objective of this work is to formulate a mathematical equation/expression which can be used to predict/estimate the value of radio refractivity for an arbitrary day of any year, with a low error of estimation, in a local environment. Sensitivity of radio refractivity to temperature, pressure and humidity has been evaluated for a period of 5 years from 2008 to 2012, in a particular area under consideration. The results presented for tropospheric radio refractivity take into consideration both the location height and scale height parameters. The results are analysed in terms of statistical measures such as the moving averages, probability density function, monthly mean values, and their corresponding standard deviations. Finally, a mathematical model is formulated to calculate the radio refractivity for any day of a whole year. Reliability of error analysis in respect to accuracy is also shown. It was implemented in the industrial enterprise.
Źródło:
Metrology and Measurement Systems; 2018, 25, 1; 115-128
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Velocity measurement using the FDOA Method in ground-based radio navigation system
Autorzy:
Sadowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/221491.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
radio navigation
spread spectrum
velocity estimation
FDOA
Opis:
Velocity is one of the main navigation parameters of moving objects. However some systems of position estimation using radio wave measurements cannot provide velocity data due to limitation of their performance. In this paper a velocity measurement method for the DS-CDMA radio navigation system is proposed, which does not require full synchronization of reference stations carrier frequencies. The article presents basics of FDOA (frequency difference of arrival) velocity measurements together with application of this method to an experimental radio navigation system called AEGIR and with some suggestions about the possibility to implement such FDOA measurements in other kinds of asynchronous DS-CDMA radio networks. The main part of this paper present results of performance evaluation of the proposed method, based on laboratory measurements.
Źródło:
Metrology and Measurement Systems; 2014, 21, 2; 363-376
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectrum Awareness in Cognitive Radio Systems
Autorzy:
Suchański, M.
Kaniewski, P.
Kosmowski, K.
Kustra, M.
Romanik, J.
Powiązania:
https://bibliotekanauki.pl/articles/1844448.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
sensing
electromagnetic environment
radio environment maps
situational awareness
Opis:
The paper addresses the issue of the Electromagnetic Environment Situational Awareness techniques. The main focus is put on sensing and the Radio Environment Map. These two dynamic techniques are described in detail. The Radio Environment Map is considered the essential part of the spectrum management system. It is described how the density and deployment of sensors affect the quality of maps and it is analyzed which methods are the most suitable for map construction. Additionally, the paper characterizes several sensing methods.
Źródło:
International Journal of Electronics and Telecommunications; 2020, 66, 4; 665-670
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Object Location Accuracy for iBeacon Technology based on the RSSI Path Loss Model and Fingerprint Map
Autorzy:
Grzechca, D. E.
Pelczar, P.
Chruszczyk, L.
Powiązania:
https://bibliotekanauki.pl/articles/226970.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Bluetooth
indoor environment
navigation
radio links
radiowave propagation
Opis:
This paper presents analysis of object location accuracy of a mobile device on the basis of the iBeacon technology. The research starts with radio signal strength indicator analysis along the corridor in order to create a path loss model for iBeacon. Two cases are taken into account: line of sight and non-line of sight for model creation. For both cases two tests: Chi-square, Shapiro-Wilk have been performed. It has also been checked if the HCI (Host Controller Interface) is a source with a memory. Acquired data have been filtered with different type of filters, e.g. median, moving average and then compared. Next, the authors evaluated the indoor positioning trilateration algorithms with the use of created model for exemplary hall. The RSSI map (radiomap) was created and the logarithm propagation model was designed. The logarithmic model estimated distance with average error 1.09m for 1 – 9m and 1.75m for 1-20m and after trilateration, the positions with average error 2.45m was achieved. A statistical analysis for acquiring data led to the final conclusion which enhanced knowledge about positioning based on the popular iBeacon technology.
Źródło:
International Journal of Electronics and Telecommunications; 2016, 62, 4; 371-378
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enabling Wireless In-band Full-duplex
Autorzy:
Elmesbahi, Jelloul
Khaldoun, Mohammed
Errami, Ahmed
Khattabi, Mohammed El
Bouattane, Omar
Powiązania:
https://bibliotekanauki.pl/articles/226551.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
in-band full-duplex
wireless
USRP
SDR
GNU radio
Opis:
This paper presents a baseband model and an enhanced implementation of the wireless full duplex analog method introduced by [1].Unlike usual methods based on hardware and software self- interference cancelation, the proposed design relies on FSK modulation. The principle is when the transmitter of a local end is sending data by modulating the carrier with the appropriate frequency deviation, its own receiver is checking if the remote transmitter is using the opposite deviation. Instead of architectures often used by both non-coherent and coherent receivers that require one filter (matched filter for coherent detection) for each frequency deviation, our design uses one mixer and one single integrator-decimator filter. We test our design using Universal Software Radio Peripheral as radio frequency front end and computer that implements the signal processing methods under free and open source software. We validate our solution experimentally and we show that in-band full duplex is feasible and synthesizable for wireless communications.
Źródło:
International Journal of Electronics and Telecommunications; 2019, 65, 3; 429-434
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Power Allocation for Energy-Harvesting-based Fading Cognitive Multiple Access Channels : with or without Successive Interference Cancellation
Autorzy:
Li, Q.
Xu, D.
Powiązania:
https://bibliotekanauki.pl/articles/963855.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cognitive radio
power allocation
multiple access channels
energy harvesting
Opis:
This paper considers a fading cognitive multiple access channel (CMAC), where multiple secondary users (SUs), who share the spectrum with a primary user (PU), transmit to a cognitive base station (CBS). A power station is assumed to harvest energy from the nature and then provide power to the SUs. We investigate the power allocation problems for such a CMAC to maximize the SU sum rate under the interference power constraint, the sum transmit power constraint and the peak transmit power constraint of each individual SU. In particular, two scenarios are considered: with successive interference cancellation (SIC) and without SIC. For the first scenario, the optimal power allocation algorithm is derived. For the second scenario, a heuristic algorithm is proposed. We show that the proposed algorithm with SIC outperforms the algorithm without SIC in terms of the SU sum rate, while the algorithm without SIC outperforms the algorithm with SIC in terms of the number of admitted SUs for a high sum transmit power limit and a low peak transmit power limit of each individual SU.
Źródło:
International Journal of Electronics and Telecommunications; 2017, 63, 1; 65-72
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 49

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies