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    Wyświetlanie 1-4 z 4
    Tytuł:
    Influence of chirp signal parameters on windowed matching filtration resolution
    Autorzy:
    Pogribny, W.
    Leszczyński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/332600.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    In this work we studied the proposed effective methods of increasing of a resolution of a matched filtration in time domain of the short broadband signals with the use of linear modulation of frequency (the so-called chirp signals) which product BT does not exceed 50 and initial frequency is not zero. The choice of matched filter pulse response parameters as smoothing window and matched to it an initial phase and a sampling rate as well as the influence of non linear operations on the matching filtration results have been investigated in order to essentially narrow the output signal main lobe as well as increase the chirp compression. The best results of the recognition resolution and compression improvement occur when at the same time there are used the non linear operations on the convolutions and the pulse response parameters are matched to the chosen window.
    Źródło:
    Hydroacoustics; 2007, 10; 157-162
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of noisy signals on base of differential correlation algorithms
    Autorzy:
    Pogribny, W.
    Rozhankivsky, I.
    Leszczyński, T.
    Lutowski, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/332673.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The study was conducted in Lake Lansk (surface area - 1042 ha, maximum depth - 53 m), in which the former dominant was vendace. Commercial catch results from the past decade indicate that there has been a seventy-two-fold decreased in vendace stocks. Hydroacoustic estimates indicate that there are 7.9 million fish in the pelagic zone. Approximately 93% of these inhabit the epilimnion (6.8 thousand fishźha-1), which is 7.6 times larger than that in the hypolimnion. There were 2.5 times fewer fish in a similarly sized southern region of the lake in 2004 than in 2001. Using the numbers, species structure, and individual weight, the biomass of the fish inhabiting the pelagic zone was calculated at 194.7 kgźha-1. The largest share was of vendace at 45.7% (89.0 kgźha-1), followed by roach at 18% (35.0 kgźha-1) and bleak at 13.1% (25.5 kgźha-1). The share of 0+ age group vendace was determined to be 70%. This might explain the decrease in commercial vendace catches caused by poor environmental conditions and overfishing. It also forecasts an improvement in resources of this species in the coming years.
    Źródło:
    Hydroacoustics; 2005, 8; 155-162
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Studying the exactitucle of digital matching filtration of widepass location signals
    Autorzy:
    Pogribny, W.
    Rozhankivsky, I.
    Milewski, A.
    Lozynsky, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/332493.pdf
    Data publikacji:
    2001
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The resolution of matching digital filtration of wide pass location signals in time domain is studied in this work. The advantages of this kind of processing in comparison to the processing on fast convolutions in frequency domain are demonstrated. A choice of parameters of the long and short chirp signals and smoothing window have been studied to increase the ratio of the main lobe to side lobes of convolutions. This choice has carried out with the use of computer simulation and result has shown in this paper.
    Źródło:
    Hydroacoustics; 2001, 4; 209-212
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The use of fast convolution and correlation analysis to increase the resistance of digital location
    Autorzy:
    Pogribny, W.
    Rożankiwsky, I.
    Milewski, A.
    Drzycimski, Z.
    Leszczyński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/332268.pdf
    Data publikacji:
    1999
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The method of analog location with the use of devices with SAW that is now being used in our country is fast, however it is nof accurate enough and has insufficient resistance to bofh natural and artificial noise. In the paper is proposed to increase the resistance of the digital location system by means of using a location system manipulated with noise-like code, and additional signal compression, filtration based on fast convolution and correlation analysis to isolate noise-like codes. The system proposed here easily adjusts to the changes in the code of the signal generated by the radar, and it also works in real time.
    Źródło:
    Hydroacoustics; 1999, 2; 167-170
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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