A comparative analysis of matched field processors for underwater acoustic source localization

Download
2010
Sarıkaya, Tevfik Bahadır
In this thesis, localization of the underwater sound sources using matched field processing technique is considered. Localization of the underwater sound sources is one of the most important problems encountered in underwater acoustics and signal processing. Many techniques were developed to localize sources in range, depth and bearing angle. However, most of these techniques do not consider or only slightly takes into account the environmental factors that dramatically effect the propagation of underwater sound. Matched field processing has been developed as a technique that fully considers the environmental factors. Matched field processing has proven to be successful in many applications such as localization of sources in range and depth, the determination of environmental parameters, and the evaluation of model accuracies. In this study, first a comparative analysis of narrowband matched field processors is given. Namely four main processors: Bartlett processor, Minimum Variance Distortionless Response (MVDR) processor, MVDR with neighboring location constraints and MVDR with environmental perturbation constraints are compared in terms of their probability of correct localization under certain environmental conditions. Secondly, a performance assesment for the most common broadband matched field processors is made. The correct localization performances for incoherent broadband matched field processor, Tolstoy/Michalopoulo's coherent matched field processor and broadband matched field processor with environmental perturbation constraints is given for certain environmental conditions. Finally, a new weighting approach to combine data for broadband matched field processing is introduced. The fact that information from different frequencies may have different reliability depending on the environmental conditions is considered to develop a weighting scheme. It is shown that a performance gain compared to existing processors can be achieved by using the weighting scheme introduced in this study.

Suggestions

3D perceptual soundfield reconstruction via sound field extrapolation
Erdem, Eg; Hacıhabiboğlui Hüseyin.; Department of Multimedia Informatics (2020)
Perceptual sound field reconstruction (PSR) is a spatial audio recording and reproduction method based on the application of stereophonic panning laws in microphone array design. PSR allows rendering a perceptually veridical and stable auditory perspective in the horizontal plane of the listener, and involves recording using nearcoincident microphone arrays. This thesis extends the two dimensional PSR concept to three dimensions and allows reconstructing an arbitrary sound field based on measurements with a...
An experimental study on off-design performance and noise in small pumps
Şahin, Fatma Ceyhun; Eralp, O. Cahit; Department of Mechanical Engineering (2007)
This thesis study is focused on experimentally investigating pump noise at design and off-design operations and its relations with pressure fluctuations. Small size pumps are placed in a semi-anechoic chamber and operated at various system conditions and various rotational pump speeds. Pump operational data, noise data and time dependent pressure data are recorded. Fast Fourier Transform spectra of noise and pressure data are compared. Coherence spectrum between sound pressure level and hydraulic pressures ...
The influence of sound properties on the semantic associations of product sounds
Verviers, Claire Juliette; Pedgley, Owaın Francıs; Özcan, Elif; Department of Industrial Design (2010)
To be able to design product sounds that elicit a predetermined expression a study was performed to find how sound properties influence the experience of their expression. Two explorative studies using figurative against abstract visual stimuli were performed to create insight in how people experience sounds and to create a list of usable semantic associations. This list was ordered in 25 expression categories each under one descriptive semantic association. A third study using mind mapping was conducted to...
The role of pore structure in sound absorption performance of lime based plasters
Meric Nursal, Işın; Tavukçuoğlu, Ayşe; Çalışkan, Mehmet (The Institute of Noise Control Engineering of the USA, Inc.; 2015-08-09)
Sound absorption performance is directly related to the pore structure of materials. The effect of materials' pore characteristics on sound absorption performance has been examined in detail, especially for materials like mineral wool, foamed metals, porous concrete, sand and soils. However, there is scarcity of knowledge in literature on relationships between sound absorption characteristics of lime-based plasters used as finishing layer(s) in buildings and their pore structure. In this study sets of lime-...
Predictions on absorption and scattering characteristics of acoustic scatterers modified with micro-perforated panels
Odabaş, Erinç; Çalışkan, Mehmet; Department of Mechanical Engineering (2012)
In this study, the basic absorption and scattering characteristics of acoustic scatterers, specifically Schroeder Diffusers, are investigated. Schroeder Diffusers are one of the most widely used acoustic scatterers in which the scattering phenomenon is predictable due to the geometry of the diffuser, based on a particular mathematical sequence. It is shown that it is possible to increase the amount of absorption by modifying the diffuser structure by means of adding perforated panels into the wells or narro...
Citation Formats
T. B. Sarıkaya, “A comparative analysis of matched field processors for underwater acoustic source localization,” M.S. - Master of Science, Middle East Technical University, 2010.