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http://dx.doi.org/10.5573/ieie.2014.51.6.228

Steering Beam Pattern Synthesis of Line Array SONAR using Modified Two Step Least Squares Method  

Park, Kyung-Min (Dept. of Weapon System Eng., ROKNA)
Lee, Seok-Jin (Dept. of Electronics Eng., KyungGi University)
Chung, Suk-Moon (Dept. of Weapon System Eng., ROKNA)
Publication Information
Journal of the Institute of Electronics and Information Engineers / v.51, no.6, 2014 , pp. 228-236 More about this Journal
Abstract
Towed array SONAR is deformed because it operates in fluid such as an ocean. It especially undergoes significant change in shape as a towing vessel takes a turn. In this case, beam pattern synthesis of the line array is limited, resulting in degradation in quality such as signal-to-noise ratio. This paper presents a modified two-step least squares algorithm based on the two-step least squares method. The shape of the sea-operated line array formation with the towing vessel changing course(angle) was modeled and the algorithm was subsequently applied. While changing course and location of the main lobe in beam pattern was altered, signal-to-noise ratio of steering beam pattern synthesis was analyzed by algorithm (proposed and others). As a result, the proposed algorithm presented improvement in performance by 2dB compared to other algorithms while forming relatively constant beam pattern.
Keywords
Line Array SONAR; Steering Beam Pattern Synthesis; Two-Step Least Squares;
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