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Wyszukujesz frazę "interference immunity" wg kryterium: Temat


Wyświetlanie 1-3 z 3
Tytuł:
Study of the GNSS Jamming in Real Environment
Autorzy:
Morong, Tomáš
Puričer, Pavel
Kovář, Pavel
Powiązania:
https://bibliotekanauki.pl/articles/963941.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
GNSS
GPS
jamming
test method
signal propagation
interference immunity
Opis:
GNSS systems are susceptible to radio interference despite then operating in a spread spectrum. The commerce jammers power up to 2 watts that can block the receiver function at a distance of up to 15 kilometers in free space. Two original methods for GNSS receiver testing were developed. The first method is based on the usage of a GNSS simulator for generation of the satellite signals and a vector signal RF generator for generating different types of interference signals. The second software radio method is based on a software GNSS simulator and a signal processing in Matlab. The receivers were tested for narrowband CW interference, FM modulated signal and chirp jamming signals, and scenarios. The signal to noise ratio usually drops down to 27 dBc-Hz while the jamming to signal ratio is different for different types of interference. The chirp signal is very effective. The jammer signal is well propagated in free space while in the real mobile urban and suburban environment it is usually strongly attenuated.
Źródło:
International Journal of Electronics and Telecommunications; 2019, 65, 1; 65-70
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods to improve interference immunity of tonal track circuits
Autorzy:
Honcharov, K.
Rybalka, R.
Powiązania:
https://bibliotekanauki.pl/articles/393890.pdf
Data publikacji:
2013
Wydawca:
Polskie Stowarzyszenie Telematyki Transportu
Tematy:
tonal track circuit
interference immunity
differential phase shift keying
correlation detector
tonowy obwód torowy
odporność na zakłócenia
detektor korelacji
Opis:
One of the ways to improve track circuits is associated with transfer of equipment to modern microelectronic element base and with using new more advanced signal processing techniques. In paper the various methods to improve interference immunity of tonal track circuits have been considered. It was proposed instead of periodic amplitude shift keying signals use the phase shift keying signals with six-bit Hamming code. This will allow to expand the number of selective marks and to increase the information redundancy of signal. As a result, the probability of correct detection of such signal under influence of interferences will increase. The expedience of using the correlation demodulation with receiving code combination by symbols also has been shown. The efficiency of proposed methods is confirmed by the results of simulation.
Źródło:
Archives of Transport System Telematics; 2013, 6, 1; 9-13
1899-8208
Pojawia się w:
Archives of Transport System Telematics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Increase of noise immunity of laser smoke fire detectors
Autorzy:
Kitsak, A.
Esipovich, D.
Poliakov, V.
Powiązania:
https://bibliotekanauki.pl/articles/136356.pdf
Data publikacji:
2011
Wydawca:
Szkoła Główna Służby Pożarniczej
Tematy:
noise immunity
laser radiation
external interference
differential scheme of smoke particles registration
Opis:
The article describes of the optical system of the proposed smoke detector construction, in which lightening of a smoke chamber is made by a focused laser beam having, according to the periodic law, a modulated spatial distribution of radiation intensity in the focal spot. This structure of the light field in the smoke flow allows to generate the algorithm of signals selection produced by the smoke particles with characteristic sizes and velocities. The result is increased stability of the smoke detector under the influence of external noise such as dust, vapor with different sizes of smoke particles and/or velocities. There are carried out model experiments on registration of time signals that are generated by particles of different sizes, crossing the plane of the beam focusing. The spectral characteristics of the recorded signals are researched. There are identificated possible algorithms for selection of signals generated by micro formations with specified medium size and speed of movement.
Źródło:
Zeszyty Naukowe SGSP / Szkoła Główna Służby Pożarniczej; 2011, 42; 123-126
0239-5223
Pojawia się w:
Zeszyty Naukowe SGSP / Szkoła Główna Służby Pożarniczej
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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