Authors A.I. Мashoshin
Month, Year 11, 2016 @en
Index UDC 681.883.77
DOI 10.18522/2311-3103-2016-11-121132
Abstract As known, the main peculiarity of hydro acoustic field is a complicated dependence of signal propagation law on hydro acoustic conditions in the region. That is why the algorithms solving the majority of the practical problems, which as a rule are the inverse, must consider the current hydro acoustic conditions or in other words they must be matched with signal propagation medium. The distinctive peculiarity of matched field algorithms structure is that their input receives not only the signal parameters measured at the hydro acoustic antenna output but so it receives the model of the transmission characteristic of the propagation channel which has been formed using current condition parameters. The classification of the sea objects on background of processing their radiated noise is one of the most complicated practical hydro acoustic problems. Its solution must consider the current hydro acoustic conditions because the decision about the object class must be adopted on the background of parameters analyses of the signal which had traveled through the oceanic waveguide and had been transformed by it in accordance with the hydro acoustic conditions in the waveguide. The target of the work is to discuss the approach to consideration of the hydro acoustic conditions when developing and realizing noisy sea objects classification algorithms. The work contains the brief description of the methodology of the syntheses of classification algorithm and its species, namely the algorithm of simultaneous object classification and ranging. The computing circuit of implementation of the synthesized algorithm which assumes 2 cyclic processes, namely the process of formation of working models of classification features and the process of object classification and ranging, is brought and discussed. Both processes are asynchronous: computation is launched when obtaining new input data that for the first process occur once in 1–2 hours, and once in 1–20 seconds for the second. On each cycle of both processes the same computation differing only in input data is implemented. The computation executed on each cycle is well parallelized as includes a large number of the same computations. The processes demand different requirements for the calculator speed: tens Mflops for the first process and some Gflops for the second process.

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Keywords Hydro acoustics; sea object classification; hydro acoustic conditions; algorithm computa-tional scheme.
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