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The features of interference striations excited by a passing ship are strongly determined by the acoustic waveguide properties. These striation position and orientation have been used for environmental inverse problems. The ship noise spectrogram can be very noisy due to measurement conditions, i.e., high ambient noise level or transmission loss noise. It is necessary to enhance the underlying interference...
To the issues of high precision and delay of the opto-electronic tracking system, the method based on main system and subsystem with double detectors is proposed. Aiming to solve the problem of underestimation of interference signal, the DOB-based robust adaptive backstepping controller is introduced in the main system. The additional interference compensation improves the robust and adaptive ability...
Broad-band sound field excited by a moving source usually exhibit striations, whose structures are characterized by the propagation medium. Such relationship has been explored for underwater inverse problems, including sediment geoacoustic characterization, source localization and target recognition. The primary step for these applications is feature extraction by interference structure processing...
Due to the dispersive characteristics of acoustic propagation in shallow water, the broad-band sound field excited by a passing ship usually exhibits an interference structure with the form of striations in the space-frequency plane. Waveguide invariant theory is derived to interpret the striation slope and has been used for underwater inverse problems including sediment geoacoustic characterization,...
An uniform distribution often appears in the space-frequency plane for broad-band, low-frequency sound intensity generated by a moving source in a shallow water environment. Waveguide invariant theory is used to interpret this phenomenon, and it has been applied for inverse problems in underwater acoustics. A vector sensor has advantages in providing both pressure and particle velocity information...
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