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Analysis reveals the effectiveness of a synchronous filter for distance determination in hydro acoustic systems, suggesting improvements over traditional methods.
The problem of simultaneous receiving of hydro acoustic signals with small frequency spacing is discussed in the paper. The use of usual band pass filter is impossible due to the known dependence of its phase characteristics from the working frequency. The building of the phase radio engineering system of distance determination is quite problematic in this case. The opportunity of the use of the synchronous filter appears due to the use of the additional reference electromagnetic (or optic) channel in radioengineering system. The phase distortions of the synchronous filter at central frequency are equal to zero. The modeling of the synchronous filter is presented in the paper. Main conclusions are drawn.
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Azarov et al. (2025) studied this question.
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