Sponsor
Portland State University. Department of Electrical and Computer Engineering
First Advisor
Lisa M. Zurk
Date of Publication
Fall 12-13-2013
Document Type
Thesis
Degree Name
Master of Science (M.S.) in Electrical and Computer Engineering
Department
Electrical and Computer Engineering
Language
English
Subjects
Sonar, Interference (Sound), Signal processing, Image processing
DOI
10.15760/etd.1487
Physical Description
1 online resource (xiii, 74 pages)
Abstract
The ability of traditional active sonar processing methods to detect targets is often limited by clutter and reverberation from ocean environments. Similarly, multipath arrivals from radiating sources such as ships and submarines are received at sensors in passive sonar systems. Reverberation and multipath signals introduce constructive and destructive interference patterns in received spectrograms in both active and passive sonar applications that vary with target range and frequency. The characterization and use of interference phenomena can provide insights into environmental parameters and target movement in conjunction with standard processing methods including spectrograms and array beamforming.
This thesis focuses on utilizing the time-frequency interference structure of moving targets captured on sonar arrays to enhance the resolution and abilities of conventional sonar methods to detect and localize targets. Physics-based methods for interference-based beamforming and target depth separation are presented with application of these methods shown using broadband simulated array data.
Rights
In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
Persistent Identifier
http://archives.pdx.edu/ds/psu/10365
Recommended Citation
Shibley, Jordan Almon, "Enhanced Sonar Array Target Localization Using Time-Frequency Interference Phenomena" (2013). Dissertations and Theses. Paper 1488.
https://doi.org/10.15760/etd.1487