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Tytuł:
Using stealth technologies in mobile robotic complexes and methods of detection of low-sighted objects
Wykorzystanie technologii stealth w mobilnych zespołach robotycznychoraz metody wykrywania niewidocznych obiektów
Autorzy:
Rudyk, Andrii
Semenov, Andriy
Semenova, Olena
Kakovkin, Sergey
Powiązania:
https://bibliotekanauki.pl/articles/2033294.pdf
Data publikacji:
2021
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
stealth technologies
mobile robotic complex
low-observable object
radar station
detection methods
signal-to-noise ratio
technologia stealth
mobilny kompleks robotów
obiekt niepozorny
stacja radiolokacyjna
metody detekcji
stosunek sygnału do szumu
Opis:
The paper outlines the latest technologies used by the world's leading manufacturers in the development of mobile low-observable robotic systems and promising measures to improve the quality of components and design of such objects. Methods of detecting objects using stealth technologies are considered, and it is shown that only due to a system approach it is possible to compensate for the reduction of the effective scattering surface of low-observable objects by technical means of radar stations. It is shown that the main method of increasing the range to the radio horizont is the use of an air-based radar. Methods of detecting objects on the traces of their interaction with the environment are promising for organization of cooperation of several radars in the detection of low-observable objects.
W artykule przedstawiono najnowsze technologie stosowane przez wiodących światowych producentów w rozwoju mobilnych systemów robotycznych o niskiej obserwowalności oraz obiecujące działania mające na celu poprawę jakości komponentów i konstrukcji takich obiektów. Rozważono metody wykrywania obiektów wykorzystujące technologie stealth i wykazano, że tylko dzięki podejściu systemowemu możliwa jest kompensacja zmniejszenia efektywnej powierzchni rozpraszania obiektów słabo obserwowalnych przez stacje radarowe. Wykazano, że główną metodą zwiększenia zasięgu do poziomu radiowego jest użycie radaru lotniczego. Metody wykrywania obiektów na podstawie śladów ich interakcji z otoczeniem są obiecujące w wykrywaniu obiektów słabo obserwowalnych przy współpracy kilku radarów.
Źródło:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2021, 11, 3; 4-8
2083-0157
2391-6761
Pojawia się w:
Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The optimal power control method in multiuser cellular networks
Autorzy:
Yaremko, O.
Stryhalyuk, B.
Maksymyuk, T.
Lavriv, O.
Kozhurov, D.
Powiązania:
https://bibliotekanauki.pl/articles/411155.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Oddział w Lublinie PAN
Tematy:
WCDMA
MIMO
power control policy
signal-to-noise ratio
traffic localization
Opis:
In this paper a method of power control policies optimization in radiointerface of mobile network with code-division multiplexing is proposed. It allows reducing the interference level in downlink and uplink channels. The optimum SNR is provided in the cell based on this power control method. The SNR is enough to ensure capacity requirements and service quality parameters.
Źródło:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes; 2013, 2, 1; 63-67
2084-5715
Pojawia się w:
ECONTECHMOD : An International Quarterly Journal on Economics of Technology and Modelling Processes
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effects of the Noise and Reverberation on the Working Memory Span of Children
Autorzy:
Jianxin, P.
Peng, J.
Powiązania:
https://bibliotekanauki.pl/articles/176546.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
reverberation time
signal-to-noise ratio
working memory span
children
Opis:
Three different reverberation time (RT) conditions were obtained by room acoustical simulation. The working memory span of grades 3 (8 to 9 years old) and 6 children (11 to 12 years old) was tested under these reverberation conditions with different signal-to-noise ratio (SNR) by headphone reproduction in a quiet classroom. The working memory span scores (WMSSs) were obtained under the different RTs and SNRs conditions. The results demonstrated that children’s age, RT and SNR had significant effect on children’s WMSSs. With the increase of SNR and the decrease of RT, the WMSSs increased gradually. Under the same SNR and RT condition, the children’s WMSSs were increased with the increase of their age. Multiple linear regression analysis shows that children’s WMSSs are related to age, RT and SNR, and the correlation coefficient is 0.99.
Źródło:
Archives of Acoustics; 2018, 43, 1; 123-128
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Development of Iteration Method for Optimization of Pair "Signal-filter"
Autorzy:
Koshevyy, V.M.
Gorishna, I.
Powiązania:
https://bibliotekanauki.pl/articles/116953.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:
iteration method for optimization
iteration method
method for optimization
Matlab
radar signals
signal-to-noise ratio
signal processing
pair signal-filter
Opis:
This paper is devoted to the improvement of the working methods of the "signal-filter" pair using an iterative procedure to maximize the signal-to-noise ratio, namely, to highlight the useful signals to provide information about the environment during the adaptive radar sensing in the conditions of obstacles. An algorithm for determining the optimal filter for suppressing undesired side lobes is proposed, which allows improving the process of detection and identification the target objects. Qualitative characteristics and the stages of space-time signal processing in the radar were justified under correlation conditions (ССF) between the received and expected signals. The using of probing radar signals, shortened in their duration were proposed in order to reduce the power of reflections from the underlying surface and increase the contrast of the radar image. A simulation test of the developed methodology was carried out in order to confirm the reliability of the proposed algebraic expressions using a mathematical model implemented in the Matlab programming environment, and a conclusion is drawn about the practical quality of the technical solutions developed on the basis of the iteration method.
Źródło:
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 3; 541-544
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 calculation of received optical power during airborne laser scanning of water object
Autorzy:
Babushka, A.
Burshtynska, K.
Babiy, L.
Powiązania:
https://bibliotekanauki.pl/articles/100274.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Rolniczy im. Hugona Kołłątaja w Krakowie
Tematy:
specular reflection
water surface
avalanche photodiode
signal-to-noise ratio
ranging
ranging standard deviation
odbicie lustrzane
powierzchnia wody
stosunek sygnału do szumu
zasięg
Opis:
In this paper calculation of some physical parameters of the receiver of laser scanning system is presented. Basic physical principles of laser scanning of water objects are considered. Ranging standard deviation for typical parameters of laser scanning system are calculated. Formula for calculation of reflected optical power for specular reflective objects is proposed.
Źródło:
Geomatics, Landmanagement and Landscape; 2014, 3; 7-15
2300-1496
Pojawia się w:
Geomatics, Landmanagement and Landscape
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface Hardness Prediction Model of Turning Duplex Stainless Steel under Different Cutting Variables
Autorzy:
Abdulateef, Osamah Fadhil
Ali, Abduljabar H.
Al Kareem, Salah Sabeeh Abed
Powiązania:
https://bibliotekanauki.pl/articles/2201899.pdf
Data publikacji:
2023
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
CNC turning
orthogonal array
ANN
signal-to-noise ratio
Opis:
The quality of machine components surfaces plays an important impact on their functional performance. Product performance may be restricted by changes to surface integrity, which includes changes to roughness, hardness, and microstructure. In this research, the impact of cutting variables in CNC turning under the conventional cooling condition on surface hardness of Duplex Stainless Steel. Cutting variables under conventional cooling, including cutting speed, feed, and depth of cut, have been optimized utilizing Taguchi’s L9 orthogonal array designed with three stages of turning variables. The optimal variable stages and the degree of significance of the cutting variables, respectively, were determined utilizing the analysis of means (ANOM) and analysis of variance (ANOVA). Effectiveness tests with optimum stages of variables were done to prove the viability of optimization by utilizing Taguchi. It has been found that the maximum surface hardness is most strongly affected by the feed 71.29%, followed by the depth of cut 12.1%, and finally the cutting speed 11.61%.
Źródło:
Advances in Science and Technology. Research Journal; 2023, 17, 1; 1--7
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Signal-to-noise analysis in a counter-pumped fiber Raman amplifier
Autorzy:
Felinskyi, G
Dyriv, M
Powiązania:
https://bibliotekanauki.pl/articles/173582.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
amplified spontaneous emission
fiber Raman amplifier
optical signal-to-noise ratio
single-mode fiber
Raman gain
Opis:
The light gain efficiency due to Raman scattering in a distributed fiber Raman amplifier is a subject of our investigation. The detailed analysis of noise properties at one-wave optical signal amplification in a single-mode fiber in the scheme of counter-pumped fiber Raman amplifier is realized in the paper. Experimental results of the amplified spontaneous emission with backward pumping as a base of optical noise evaluation are presented. Raman gain spectrum for a coherent Stokes low-powered signal is calculated and it is compared with the observed spectrum of non-coherent amplified spontaneous emission noise. It is shown that an output optical signal has higher gain than the amplified spontaneous emission and it results in the appreciable growth in the output optical signal-to-noise ratio.
Źródło:
Optica Applicata; 2014, 44, 4; 493-501
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sensor Hop-based Energy Efficient Networking Approach for Routing in Underwater Acoustic Communication
Autorzy:
Kohli, S.
Bhattacharya, P. P.
Powiązania:
https://bibliotekanauki.pl/articles/309397.pdf
Data publikacji:
2017
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
attenuation
clustering
multi-hop routing
signal-to-noise ratio
transmission loss
Opis:
Underwater Wireless Sensor Networks are deployed to explore the world under the water, measure different parameters and communicate the data to the surface, in the widespread applications. The main operating technology of these networks is the acoustic communication. The communication among the sensors and finally to the surface station requires a routing protocol. The sensors being battery limited and unfeasible to be replaced under the water requires an energy efficient routing protocol. Clustering imparted in routing is an energy saving technique in sensor networks. The routing may involve single or multi hop communication in the sensor networks. The paper gives a comparative study of the benchmark protocol multi-hop LEACH with the proposed Sensor Hop-based Energy Efficient Networking Approach (SHEENA) for the shallow as well as deep water in three dimensional Underwater Wireless Sensor Networks. The network energy model for the Underwater Wireless Sensor Networks is based among the different acoustic channel characteristics. The proposed approach is found to give better response.
Źródło:
Journal of Telecommunications and Information Technology; 2017, 1; 44-49
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sampling Jitter in Audio A/D Converters
Autorzy:
Kulka, Z.
Powiązania:
https://bibliotekanauki.pl/articles/177046.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
analog-to-digital converter
ADC
successive approximation register (SAR)
sigma-delta ADC
sample-and-hold circuit
DT sigma delta modulator
CT sigma delta modulator
time jitter
aperture jitter
clock jitter
periodic clock jitter
signal-to-noise ratio (SNR)
Opis:
This paper provides an overview of the effects of timing jitter in audio sampling analog-to-digital converters (ADCs), i.e. PCM (conventional or Nyquist sampling) ADCs and sigma-delta (ΣΔ) ADCs. Jitter in a digital audio is often defined as short- term fluctuations of the sampling instants of a digital signal from their ideal positions in time. The influence of the jitter increases particularly with the improvements in both resolution and sampling rate of today’s audio ADCs. At higher frequencies of the input signals the sampling jitter becomes a dominant factor in limiting the ADCs performance in terms of signal-to-noise ratio (SNR) and dynamic range (DR).
Źródło:
Archives of Acoustics; 2011, 36, 4; 831-849
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Relationship Between Chinese Speech Intelligibility of Elderly and Speech Transmission Index
Autorzy:
Peng, Jianxin
Zeng, Jiazhong
Zhao, Yuezhe
Powiązania:
https://bibliotekanauki.pl/articles/1953494.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
speech intelligibility
speech transmission index
signal-to-noise ratio
background noise level
speech sound pressure level
reverberation time
Opis:
In this paper, the relationship between Chinese speech intelligibility (CSI) scores of the elderly aged 60-69 and over 70 years old, and speech transmission index (STI) were investigated through the auralization method under different reverberation time and background noise levels (BNL, 40 dBA and 55 dBA). The results show that the CSI scores of the elderly are significantly worse than those of young adults. For the elderly over 70, the CSI scores become much lower than those of young adults. To be able to achieve the same CSI, the elderly, especially those over 70, need much higher STI and greater SNR than the young. The elderly aged 60-69 and over 70 need to improve their STI by 0.419 and 0.058 respectively under BNL 40 dBA, as well as 0.282 and 0.072 respectively under BNL 55 dBA, so as to obtain the same CSI scores as the young adults.
Źródło:
Archives of Acoustics; 2021, 46, 2; 229-235
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oszacowanie stosunku sygnału do szumu w asynchronicznych przetwornikach analogowo-cyfrowych
Signal-to-Noise Ratio for asynchronous analog-to-digital converters
Autorzy:
Jabłeka, M.
Powiązania:
https://bibliotekanauki.pl/articles/156639.pdf
Data publikacji:
2011
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
przetworniki analogowo-cyfrowe
stosunek sygnału do szumu
próbkowanie
kwantyzacja
analog-to-digital converters
signal-to-noise ratio
sampling
quantization
Opis:
W artykule przedstawiono porównanie współczynnika stosunku sygnału do szumu (SNR) dla synchronicznych oraz asynchronicznych przetworników analogowo-cyfrowych. Badania wykonano dla trzech modeli stochastycznych sygnałów wejściowych o rozkładach Gaussa, równomiernym oraz sygnału sinusoidalnego. Oszacowano spadek wartości współczynnika SNR dla asynchronicznego przetwornika analogowo-cyfrowego typu Sigma-Delta w porównaniu z klasycznym przetwornikiem synchronicznym, wywołany odpowiednio nieliniowością bloku próbkującego (-10dB) oraz niejednoznacznością procesu kwantyzacji (-3dB).
This paper shows the difference between the SNR level for classical synchronous analog-to-digital converters (ADC) and asynchronous Sigma-Delta analog-to-digital converters (ASD ADC) (Fig. 2) [4, 5]. Simulative evaluation shows that the conversion quality for ASD ADCs is about 2 bit worse than for classical synchronous ADCs (Tabs. 1 and 2). The reason for such a difference is firstly the nonlinearity of an ASD ADC sampling block (ASDM) (-10dB in SNR value) and secondly the quantization noise whose variance value is two times bigger than in case of classical ADCs ( 3dB in SNR). Such big quantization noise is caused by the need of measuring the time position of two independent pulse edges with uniform probability density function (pdf) for the quantization error [8]. The difference for these two measurements yields a triangular distribution which overlaps consecutive quantization intervals (Fig. 1b) and is the source of uncertainty of the digital word at the ASD ADC output [8]. Simulations were performed for four configurations of sampling and quantization blocks, the classical ADC and three other sets of linear/nonlinear sampling blocks and certain/uncertain quantization blocks. Such simulation methodology shows the influence of properties of each element of the signal path in the ASD-ADC on the quantization noise pdf (Fig. 3). The SNR is evaluated for three stochastic models of input signals: Gauss, uniform and sinusoidal signal. Comparison requires assuming the proper amplitude and frequency domain, because of balance between the dynamic range and bandwidth of the ASD ADC.
Źródło:
Pomiary Automatyka Kontrola; 2011, R. 57, nr 1, 1; 30-32
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of Mechanical Characteristics of Rice Husk Particle Reinforced Polymer Composites Using Taguchi Experimental Technique
Autorzy:
Jena, Dayanidhi
Mohapatra, Ramesh Chandra
Das, Alok Kumar
Powiązania:
https://bibliotekanauki.pl/articles/1062954.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Analysis of Variance (ANOVA)
Analysis of means (ANOM)
Polymer resin
Rice husk particles
Signal to noise (S/N) ratio
Taguchi design
Opis:
In this study a successful fabrication of rice husk filled polymer composites with different filler content was possible by hand lay-up technique. An experimental approach was used to determine the tensile strength & flexural rigidity of rice husk filled polymer composites using Instron Model 1122 testing machine (Instron Corp. Canton, MA). At last, Optimization of mechanical properties of rice husk filled polymer composites was done using Taguchi Technique. The analysis of means (ANOM) was done to find out the optimal parameter level & analysis of variance (ANOVA) was employed to identify the level of importance on the parameters on each of the properties. In the present work the ANOM results showed that the combination of rice husk particle size of 150 µm with volume fraction of filler material (15%) with Epoxy as the matrix material is beneficial for maximizing the mechanical properties of rice husk particles reinforced polymer composite materials. From ANOVA results, it was found out that the polymer resin has major influence (80.344% & 84.17%) on maximizing tensile and flexural strength. Finally, the results revealed that using rice husk particles as reinforcement for polymer matrix could successfully develop beneficial composites and can be used for the mechanical applications.
Źródło:
World Scientific News; 2019, 124, 2; 155-170
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Noise effect on parameters of quiet sonar with code modulation
Autorzy:
Salamon, Roman
Marszal, Jacek
Jedel, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/24201997.pdf
Data publikacji:
2023
Wydawca:
Politechnika Poznańska. Instytut Mechaniki Stosowanej
Tematy:
silent sonar
maximum length sequence
signal-to-noise ratio
frequency modulation
cichy sonar
sekwencje o maksymalnej długości
stosunek sygnału do szumu
modulacja częstotliwości
Opis:
Earlier publications of the paper authors have shown that the use of code keying mixed with the CW FM sound signal allows the significant reduction in the distance measurement error, compared to classic silent CW FM sonar. In addition to the code modulation parameters, the magnitude of this error is influenced by the received input acoustic noise. The article shows the dependence of the input signal-to-noise ratio and the sound signal parameters on the target distance measurement error and the detection conditions, such as the output signal-to-noise ratio and the side lobe level. The results of the analysis were compared to the same parameters of the CW FM silent sonar without code modulation.
Źródło:
Vibrations in Physical Systems; 2023, 34, 1; art. no. 2023109
0860-6897
Pojawia się w:
Vibrations in Physical Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
NEW THROUGHPUT OPTIONS IN 802.11AX STANDARD
Nowe opcje przepływności w standardzie 802.11ax
Autorzy:
Masiukiewicz, Antoni
Piórczyński, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/439811.pdf
Data publikacji:
2019
Wydawca:
Akademia Finansów i Biznesu Vistula
Tematy:
throughput, 802.11ax standard
signal to noise and interference ratio
przepustowość standard 802.11ax
stosunek sygnał do szumu i zakłóceń
Opis:
The throughput offered in the 802.11 standard are now similar to those offered in wired solutions. The newly developed 802.11ax standard also offers new operation opportunities in an environment with high density of users. The author, using the theoretical dependencies and the ns-3.27 version of the NS simulator, compared the throughput in the 802.11n / ac / ax standards and determined the throughput for selected configurations of the radio channel parameters. The throughput of 802.11ax is usually higher then in older standards however there are some exceptions.
Przepustowość oferowana w standardzie 802.11 jest obecnie podobna do przepustowości oferowanej w rozwiązaniach przewodowych. Nowo opracowany standard 802.11ax oferuje także nowe możliwości działania w środowisku o dużej gęstości użytkowników. Autor, wykorzystując teoretyczne zależności i wersję ns-3.27 symulatora NS, porównał przepustowość w standardach 802.11n / ac / ax i określił przepustowość dla wybranych konfiguracji parametrów kanału radiowego. Przepustowość 802.11ax jest zwykle wyższa niż w starszych standardach, jednak są pewne wyjątki.
Źródło:
Kwartalnik Naukowy Uczelni Vistula; 2019, 3(61); 43-56
2084-4689
Pojawia się w:
Kwartalnik Naukowy Uczelni Vistula
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Low-noise Wideband Circuit for Closed-loop RF CNT-NEMS Sensors
Autorzy:
Kauth, C.
Pastre, M.
Kayal, M.
Powiązania:
https://bibliotekanauki.pl/articles/397979.pdf
Data publikacji:
2012
Wydawca:
Politechnika Łódzka. Wydział Mikroelektroniki i Informatyki
Tematy:
stosunek sygnału do szumu
detekcja sygnałów
współczynnik szumu
wzmacniacze niskoszumowe
szerokie pasmo
piezooporność
system nanoelektromechaniczny
oscylator
signal-to-noise ratio
signal detection
noise figure
low-noise amplifiers
wideband
piezoresistance
nanoelectromechanical systems
oscillators
Opis:
Hybrid NEMS interfaces are the key to systems combining the benefits of highly sensitive miniaturized mechanical sensors with the vast functionalities available in electronics. In this context, a phase-locked loop, locking on a suspended resonating carbon nanotube NEMS, is implemented and characterized, able to start, track, amplify and sustain NEMS oscillation up to 100MHz in a sensing environment. Detection of the signals out of the NEMS has been found most challenging and diverse RF front-ends meant for interfacing high-impedance carbon nanotube based NEMS are analyzed. Given the feeble signals from the NEMS, their high output impedance and non-negligible interconnect parasitics, front-end design must imperatively focus on minimal noise figure. Limits on minimal detectable signal are extracted via design, simulation and characterization of a 3-stage common-emitter front-end.
Źródło:
International Journal of Microelectronics and Computer Science; 2012, 3, 2; 67-72
2080-8755
2353-9607
Pojawia się w:
International Journal of Microelectronics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł

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