Proud elastic target discrimination using low-frequency sonar signatures

• Other Authors: Mallen, Brenton.
• Format: Others
• Language: English
• Published: Florida Atlantic University
• Subjects: Pattern recognition systems; Frequency response (Dynamics); Signal theory (Telecommunication); Random noise theory
• Online Access: http://purl.flvc.org/FAU/3342210

This thesis presents a comparative analysis of various low-frequency sonar signature representations and their ability to discriminate between proud targets of varying physical parameters. The signature representations used include: synthetic aperture sonar (SAS) beamformed images, acoustic color plot images, and bispectral images. A relative Mean-Square Error (rMSE) performance metric and an effective Signal-to-Noise Ratio (SNReff) performance metric have been developed and implemented to quantify the target differentiation. The analysis is performed on a subset of the synthetic sonar stave data provided by the Naval Surface Warfare Center - Panama City Division (NSWC-PCD). The subset is limited to aluminum and stainless steel, thin-shell, spherical targets in contact with the seafloor (proud). It is determined that the SAS signature representation provides the best, least ambiguous, target differentiation with a minimum mismatch difference of 14.5802 dB. The acoustic color plot and bispectrum representations resulted in a minimum difference of 9.1139 dB and 1.8829 dB, respectively === by Brenton Mallen. === Thesis (M.S.C.S.)--Florida Atlantic University, 2012. === Includes bibliography. === Electronic reproduction. Boca Raton, Fla., 2012. Mode of access: World Wide Web.