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Wyświetlanie 1-15 z 49
Tytuł:
Nonlinear Frequency Modulated Signal Design
Autorzy:
Leśnik, C.
Powiązania:
https://bibliotekanauki.pl/articles/1807736.pdf
Data publikacji:
2009-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
84.40.Ua
84.40.Xb
Opis:
The signal time-frequency structure designing is the important problem of radar system solution optimisation. The radar ambiguity function is the very useful signal characteristic that enables to know the signal potential possibilities. The effective numerical methods of the radar ambiguity function calculation give possibility for synthesis of the radar signal having expected features. The synthesis method concerning the nonlinear frequency modulation radar signal is presented in the paper. For the radar ambiguity function calculation the Zak transform is used in the method. The nonlinear frequency modulation signal model was described in which application limitations were taken into account. Examples of simulation research results are presented as a comment of the considerations.
Źródło:
Acta Physica Polonica A; 2009, 116, 3; 351-354
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure Optimization of Phase-Coded Sounding Signals
Autorzy:
Szczegielniak, D.
Milewski, A.
Powiązania:
https://bibliotekanauki.pl/articles/1537555.pdf
Data publikacji:
2010-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
84.40.Ua
84.40.Xb
Opis:
Pulse compression with a small sidelobe level is one of challenges in designing of modern radar, sonar or ultrasound imaging systems. It may be performed by means of matched filter, that is by correlating the received sounding signal with a stored replica of the transmitted signal. The advantage of the pulse compression method is the increase of the average transmission power while retaining the range resolution corresponding to a short pulse. Phase coding is one of the early techniques for pulse compression of radar signals. Polyphase sequences, which have low sidelobe levels, ensure an easily detectable peak in the output of a matched filter, in other words an easy detection of a received sounding signal. In this paper, an evolutionary algorithm combined with a local optimizer is used to search for polyphase codes with a small sidelobe level of an aperiodic autocorrelation function. The evolutionary algorithm is based on a floating-point representation and the Gaussian mutation is used to produce offspring for the next generation. The self-adaptation mechanism is used to control the mutation operator during the evolutionary process. This research demonstrates that optimization methods can effectively find polyphase sequences with low autocorrelation and seems to be very promising for the future research in area of computer optimization for polyphase codes synthesis.
Źródło:
Acta Physica Polonica A; 2010, 118, 1; 164-167
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Matched Filtration of LFM Signals with Non-Zero Initial Frequency
Autorzy:
Leszczynski, T.
Powiązania:
https://bibliotekanauki.pl/articles/1399382.pdf
Data publikacji:
2013-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
84.40.Xb
84.40.Ua
Opis:
This paper presents the results of the research considering the influence of the initial frequency on linear frequency modulation signal compression. The signal compression has been performed using the digital matched filtration in the time domain. The ratio of peak to side lobe ratio with the width of the main lobe equaling one sampling period is the measure of the quality of compression. In general, a lower value of peak to side lobe ratio is obtained for linear frequency modulation signals with a non-zero initial frequency than with a zero initial frequency. The peak to side lobe ratio is systematically decreasing with the increase of the initial frequency f_1. The existing methods of band signals sampling, where the spectrum of the signals is transferred by means of the carrier signal $f_0$ of a significantly higher frequency than the band B ($f_0$ ≫ B) may be effectively used for sampling signals considered in this study, which do not have a carrier. As a result, for the linear frequency modulation signals with a non-zero initial frequency $f_1$ = nB and a final frequency $f_2$ = (n + 1) B, n = 1, 2, ..., the same peak to side lobe ratio values will be obtained as for linear frequency modulation signals with a zero initial frequency and the identical band and time duration. The results of this research could be implemented in sonar and radiolocation techniques and medicine.
Źródło:
Acta Physica Polonica A; 2013, 124, 3; 494-497
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simon H./ Funk-Baker G. (2017), Deutsche Rechtssprache. Ein Studien- und Arbeitsbuch mit Einführung in das deutsche Recht, 6., neubearbeitete Auflage, C.H. Beck u.a. München u.a., S. 334. ISBN 978-3-406-69256-7, 978-3-7190-3819-9, 978-3-7007-7105-0
Autorzy:
Księżyk, Felicja
Powiązania:
https://bibliotekanauki.pl/articles/973347.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Warszawski. Wydział Lingwistyki Stosowanej
Źródło:
Applied Linguistics Papers; 2018, 25/4; 235-239
2544-9354
Pojawia się w:
Applied Linguistics Papers
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Performance Enhancement of Telemedicine Network by Free Space Optics Links Provisioning
Autorzy:
Siraj, M.
Shoaib, M.
Memon, I.
Powiązania:
https://bibliotekanauki.pl/articles/1033389.pdf
Data publikacji:
2017-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
84.40.Ua
Opis:
Health care has benefited immensely with the implementation of fast moving information technology. It is a challenging assignment for the researchers to implement the present day technologies such as wireless mesh networks. Wireless mesh networks are deployed to guarantee a reliable and stable network infrastructure backbone to telemedicine systems. They are preferred to other wireless networks, as the solution which they provide is robust for broadband services. They are robust because if routing is not possible due to some mesh nodes failure, routing can be done by the other mesh nodes present. Wireless mesh network cannot only spread coverage but also save both cabling cost and human resource. However, their performance is degraded due to interference and varying load. Interference is a critical issue in wireless mesh networks. The interference occurs because of the congested unlicensed radio frequency spectrum. This problem can be addressed by applying free space optics technology for transmission instead of radio frequency technology in the unlicensed spectrum. Network capacity issue is addressed by provisioning free space optics links to generate the much needed throughput and to minimize interference. Telemedicine network is a network, which requires a high capacity bandwidth to cater for a large number of remote patients. It is observed that free space optics links provisioning results in a significant performance enhancement for the telemedicine network.
Źródło:
Acta Physica Polonica A; 2017, 131, 1; 43-45
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Video on Demand Over Optical Wireless Communication Links
Autorzy:
Siraj, M.
Memon, M.
Khan, M.
Powiązania:
https://bibliotekanauki.pl/articles/1191713.pdf
Data publikacji:
2016-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
84.40.Ua
42.15.Eq
Opis:
Video on demand technology is a modern wireless communication application which requires a large bandwidth. Optical wireless networks, as a potential alternative to radio frequency, is an emerging technology that is easier to set up and provides a cost effective solution, where a physical network is difficult to deploy. Optical wireless networks can be used as a backbone to provide the much needed bandwidth for video on demand application. In this paper, Wavelength Division Multiplexing modulation scheme is proposed for the optical wireless networks due to its significance of transmitting distinct data channels at different wavelengths. Wavelength Division Multiplexing can be easily integrated with optical wireless networks, consequently resulting in an increased data rate. This paper presents a novel approach of integrating video on demand with the state of art Wavelength Division Multiplexing based optical wireless networks. Furthermore, the paper discusses the challenges and advantages over the convention modulation schemes.
Źródło:
Acta Physica Polonica A; 2016, 129, 4; 826-828
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modification of a Weighting Function for NLFM Radar Signal Designing
Autorzy:
Leśnik, C.
Kawalec, A.
Powiązania:
https://bibliotekanauki.pl/articles/1811542.pdf
Data publikacji:
2008-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
84.40.Ua
84.40.Xb
Opis:
Modification of the weighting raised cosine with a power n function by time convolution with auxiliary changeable time duration uniform rectangular window is presented in this paper. The analytical form of the modified weighting raised cosine function for fixed power in frequency domain was derived. Proposed method was applied to fine tuning of properties of the nonlinear frequency modulation of radar signals. Synthesis of nonlinear frequency modulation radar signals problem was solved using the well-known principle of stationary phase. The selected testing results are shown and some final conclusions are formulated.
Źródło:
Acta Physica Polonica A; 2008, 114, 6A; A-143-A-149
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Antenna Beam Broadening in Multifunction Phased Array Radar
Autorzy:
Fatemi Mofrad, R.
Sadeghzadeh, R.
Powiązania:
https://bibliotekanauki.pl/articles/1505195.pdf
Data publikacji:
2011-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
84.40.Ba
84.40.Xb
84.40.Ua
Opis:
A phased array antenna is designed for multifunction phased array radar simulation test bed. Effect of element pattern, mutual coupling between elements, phase quantization, amplitude and phase error and elements failure rates on array pattern are discussed. Target angle measurement and side lobe cancelling, in order to reduce jamming power through side lobes, is illustrated in this antenna. Also antenna beam width is broadened with different methods and compared with narrow beam characteristics. It is shown that, for special broadening factors, beam broadening may lead to a better coverage and power efficiency relative to narrow beam antenna.
Źródło:
Acta Physica Polonica A; 2011, 119, 4; 461-466
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechthild Habermann, Gabriele Diewald, Maria Thurmair (Hrsg.). Fit für das Bachelorstudium. Grundwissen Grammatik. Dudenverlag: Mannheim u.a. 2009, 211 S.
Autorzy:
Aptacy, Jarosław
Powiązania:
https://bibliotekanauki.pl/articles/919744.pdf
Data publikacji:
2011-01-01
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Źródło:
Glottodidactica. An International Journal of Applied Linguistics; 2011, 38, 1; 110-112
0072-4769
Pojawia się w:
Glottodidactica. An International Journal of Applied Linguistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
“Questa è parte, che ua incatenando, et ordinando il parlamento”. Le congiunzioni nella tradizione grammaticale italiana
Autorzy:
Consales, Ilde
Powiązania:
https://bibliotekanauki.pl/articles/2083489.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conjunctions
Italian grammatography
Latin grammatography
Opis:
“Questa è parte, che ua incatenando, et ordinando il parlamento”. Conjunctions in Italian grammatography – The present essay examines how conjunctions are discussed in Italian grammatography from the 15th to the 20th Century.
Źródło:
Kwartalnik Neofilologiczny; 2019, 2; 330-340
0023-5911
Pojawia się w:
Kwartalnik Neofilologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Joanna Drynda: Spiegel-Frauen. Zum Spiegelmotiv in Prosatexten zeitgenössischer österreichischer Autorinnen. Frankfurt a.M. u.a.: Lang, 2012, 357 S.
Autorzy:
Torzewska-Nowak, Kamila
Powiązania:
https://bibliotekanauki.pl/articles/1178780.pdf
Data publikacji:
2013-01-01
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Źródło:
Studia Germanica Posnaniensia; 2013, 34; 194-199
0137-2467
Pojawia się w:
Studia Germanica Posnaniensia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Automatic Classification of LFM Signals for Radar Emitter Recognition Using Wavelet Decomposition and LVQ Classifier
Autorzy:
Świercz, E.
Powiązania:
https://bibliotekanauki.pl/articles/1505216.pdf
Data publikacji:
2011-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
84.40.Ua
84.35.+i
Opis:
The paper presents a novel approach, based on the wavelet decomposition and the learning vector quantisation algorithm, to automatic classification of signals with linear frequency modulation, generated by radar emitters. The goal of radar transmitter classification is to determine the particular transmitter, from which a signal originated, using only the just received waveform. To categorise a current linear frequency modulation signal to the particular transmitter, the discrete wavelet decomposition of the received signal is accomplished in order to get a representative set of features with good classification properties. The learning vector quantisation algorithm with a previously defined set of features as an input of the learning vector quantisation neural net is proposed as the intelligent classification algorithm, which combines competitive learning with supervision. After the learning process, the learning vector quantisation algorithm is ready to perform the classification process for different data than data used in the learning stage. Simulation results show the high classification accuracy for experimentally chosen wavelets and suggested architecture of the learning vector quantisation classifier.
Źródło:
Acta Physica Polonica A; 2011, 119, 4; 488-494
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Book review: María José Domínguez Vázquez (hg.) 2013: Trends in der Deutsch-Spanischen Lexikographie. Frankfurt a.m. [u.a.]: Peter Lang.
Autorzy:
Bielińska, Monika
Powiązania:
https://bibliotekanauki.pl/articles/2049924.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Źródło:
Linguistica Silesiana; 2015, 36; 295-296
0208-4228
Pojawia się w:
Linguistica Silesiana
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Integration of OPC UA information models into Enterprise Knowledge Graphs
Autorzy:
Weiss, Arno
Ihlenfeldt, Steffen
Powiązania:
https://bibliotekanauki.pl/articles/2086280.pdf
Data publikacji:
2022
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
digital twin
manufacturing system
machining 4.0
machine tool
intelligent function
Opis:
Building repositories of data relevant for enterprise operations requires harmonization of formats and semantics. OPC UA’s nodes-and-references data model shares basic elements with well-established semantic modeling technologies like RDF. This paper suggests the use of transformed OPC UA information models on the higher level of Enterprise Knowledge Graphs. It proposes good practice to integrate the separate domains by representing OPC UA servers as RDF-graphs and subsequently attaching them to Digital Twins embedded in Enterprise Knowledge Graph structures. The developed practice is implemented, applied to combine a server’s structure with an existing knowledge graph containing an Asset Administration Shell and released open source.
Źródło:
Journal of Machine Engineering; 2022, 22, 2; 138--147
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 49

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