title: Striation-based beamforming for active sonar with a horizontal line array.
abstract: A physics-based method for beamforming signals measured on a horizontal array is developed with an application to underwater active sonar systems. The proposed striation-based beamformer coherently combines the pressure from each element in the array at different frequencies, and these frequencies are selected based on a striation hypothesis. The linear frequency shift and corresponding phase term introduced in the array weight vector accounts for multipath-induced fading, producing beam output with increased signal gain. The method is demonstrated using data collected on an array towed in the North Atlantic. The combination of the striation-based beamformer with the waveguide invariant concept to improve tracker performance is discussed.
authors.affiliation: Northwest Electromagnetics and Acoustics Research Laboratory, Department of Electrical Engineering, Portland State University, Portland, Oregon 97201-0751, USA. zurkl@pdx.edu
authors.forename: Lisa M
authors.initials: LM
authors.lastname: Zurk
authors.forename: Daniel
authors.initials: D
authors.lastname: Rouseff
mesh_terms: D000162:Acoustics / Q000295:instrumentation; D004867:Equipment Design; D008962:Models, Theoretical; D009038:Motion; D011312:Pressure; D012815:Signal Processing, Computer-Assisted; D013016:Sound; D013018:Sound Spectrography; D013997:Time Factors; D014160:Transducers, Pressure; D014867:Water
chemical_list: D014867:Water