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Study on the Echo Recognition Method of Bottomed Shell Column with Ball Sphere Head

Author: LiRan
Tutor: SunHui
School: Harbin Engineering University
Course: Underwater Acoustics
Keywords: Sink to the bottom target Pattern Recognition STFT Wegener - Wiener distribution Fuzzy fusion classifier
CLC: U666.7
Type: Master's thesis
Year: 2007
Downloads: 81
Quote: 0
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Abstract


Due to the interface introduced in the end of the reverb and add echo , sink to the bottom of the target echo signal has letters mixed complex than low and structure , its detection and identification extremely difficult . Target echo signal and reverb signal characteristics of the chirp signal , the short-time Fourier (STFT) filtering and Wigner-Ville cross term filtering are two ways to improve letter to sink to the bottom target echo signal mixed ratio. On this basis , given the target feature extraction method , and with fuzzy fusion classifier (FFC) network used in combination to achieve the classification and recognition to sink to the bottom ball crown-shaped head cylindrical shell target echo . Distribution of the target echo signal in the time-frequency domain , the chirp signal is a slash , and the reverberation of the chirp signal distribution along the timeline clutter distributed in the transmitted signal frequency along the time-varying long between the frequency and the minimum frequency band , based on this characteristic , proposed frequency domain filtering method . A chirp signal and its after copy signal frequency shift added Wigner-Ville distribution , cross terms will have an interaction generated in this cross - item reverb role weaken , based on the characteristics of Wigner-Ville cross term filtering methods . Finally, a recognition system using the FFC the network as a sorter . In order to verify the identification system proposed in this paper , the pond sink to the bottom of the target echo experiment . Processing analysis of experimental data using the identification system .

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CLC: > Transportation > Waterway transport > Marine Engineering > Navigation equipment, acoustic equipment > Acoustic equipment
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