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1

Dostęp do szerokopasmowych usług

Michalak J.

Elektronika : konstrukcje, technologie, zastosowania

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2017

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Vol. 58, nr 1

10--16

PL

W artykule przedstawiono analizę wpływu bezprzewodowych technologii teleinformatycznych na życie współczesnego człowieka w kontekście dostępu do szerokopasmowych usług. Po krótkim wprowadzeniu i zaprezentowaniu podstawowych definicji, omówiono wybrane usługi szerokopasmowe i przedstawiono szereg statystyk rynkowych obrazujących stopień rozpowszechnienia wybranych technik i rodzajów usług w poszczególnych rejonach Świata na przestrzeni lat. Obserwując rozwój tego rodzaju rozwiązań łatwo dostrzec fakt, że ludzie znacznie się od nich uzależniają. W odniesieniu do powyższego, pomijając problem zachowania prawa do prywatności, warto mieć na uwadze skutki możliwych do zrealizowania scenariuszy, w których moglibyśmy zostać choćby czasowo pozbawieni tego rodzaju udogodnień.

EN

The analysis of influence of broadband wireless data communications techniques on contemporary human being was presented in this article. Problems were described in the context of broadband services. After short introduction, chosen services as well as some statistical information related with broadband wireless access in the World were discussed. As a result, omitting our privacy rights problem, it is observed that people are becoming very dependent on such services. Therefore we have to be aware of possible to realize scenarios in which we can, even temporary, be deprived of such conveniences.

2

Antenna Arrays Focused on Broadband Signals

Vedenkin D. A., Sedelnikov Y. E., Nasybullin A. R.

Journal of Telecommunications and Information Technology

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2016

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nr 2

95--102

EN

Broadband and ultra-wideband signals are increasingly used in modern radio systems. Traditional performance of evaluation antennas operating with narrowband signals are not always adequately reflect the characteristics of broadband antennas, at least in view of the frequency dependence of the antenna pattern. Accounting for broadband signals the antennas becomes important in the low-frequency range of the spectrum. Systems using these types of signals may include control of the atmosphere and measuring its frequency-selective properties in the range meter and decameter wavelengths. Possibility of spatial selection based on focusing of broadband signals in this case promises to implement a number of additional features. Therefore, it is important to evaluate the properties of antennas based on the spectral content of the signal, as well as taking into account the ways of its processing in the receiving equipment. Consideration features of functioning the antenna array, focused on broadband signal is devoted to this article.

3

Ocena wpływu interferencji w postaci sygnału szerokopasmowego na dokładność wyznaczania pozycji obiektów BSP

Komorek A., Bieńczak R., Kowalik R.

Autobusy : technika, eksploatacja, systemy transportowe

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2016

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R. 17, nr 6

915--920

PL

W artykule omówiono analizę matematyczną wpływu sygnału szerokopasmowego na poprawne funkcjonowanie odbiornika nawigacji satelitarnej GNSS znajdującego się na wyposażeniu bezzałogowego statku powietrznego BSP. Zaprezentowane w artykule modele matematyczne poddano badaniom symulacyjnym, a uzyskane na tym etapie wyniki zaprezentowano w postaci charakterystyk szumowych (BER). Jakkolwiek przedstawione w referacie wyniki odnoszą się do konkretnego odbiornika GNSS, stąd mogą się one różnić w zależności o rodzajów radiowych urządzeń nawigacyjnych.

EN

The article discusses the mathematical analysis of the impact of broadband signal on the proper functioning of the GNSS receiver located supplied unmanned aircraft BSP. Presented in this paper mathematical models were tested simulation, and from this step results presented in the form of noise characteristics (BER). Although the results presented in this paper relate to specific GNSS receiver, so they can vary depending on the type of radio navigation equipment.

4

Tracking of the broadband source of the underwater noise in the very shallow water conditions

Grelowska G., Kozaczka E.

Hydroacoustics

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2015

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Vol. 18

77--86

EN

The paper contains the results, both theoretical and experimental, connected with the tracking of the underwater noise source as small ships, pontoon, diver and so on. The problem of security in the shallow water area is the challenge for underwater acousticians. In this paper there is taken into account the detection of the sources that move on the surface of the sea or underwater in shallow and very shallow water. The main goal deals with characterization of the sound propagation at the shallow water channel. The next problem is formulation of the sound propagation inside of this acoustic duct including normal mode creations and dispersion of the acoustic energy. When we take into account the small ships noise the two main sources are analyzed. The first one is the vibration energy produced by the mechanisms located inside of the ship hull. The acoustical energy is transformed through structural elements of the hull to surrounding water. This energy propagates as broadband underwater noise. The next source is the ship propeller. The sources of the underwater noise give the some deposit to the total acoustical energy that means the ambient noise. The problem that should be solved is to discover these acoustical disturbances along with their classification, identification and tracking.

5

Detection on broadband signals in the field of aperture and array systems

Mazurek R., Lasota H., Budzińska I.

Hydroacoustics

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2003

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Vol. 6

275--284

EN

Antennas and antenna arrays in low band underwater systems introduce significant linear distortions that affect the detection of broadband signals. The article gives an analysis of the distortions using the space-time impulse response method. The signal received at different directions is subjected to two types of filtration, one matched to the transmitted signal and another one matched to the distorted signal. For the purpose of the simulation the Matlab software was used. Detection performance can be greatly enhanced, if receiver design takes account of the distortions.