Beam pattern analysis for beam homogenization of conformal array sonar

Jeong-Ung Choi; Wooyoung Hong; Jun-Seok Lim; Keunhwa Lee

doi:10.7776/ASK.2022.41.6.637

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2022 Vol.41, Issue 6 Preview Page Next Page

Research Article

Beam pattern analysis for beam homogenization of conformal array sonar 곡면 배열 소나의 빔 균일화를 위한 빔 패턴 분석

30 November 2022. pp. 637-646

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Abstract

Sub-arrays of arbitrary conformal array have different geometric shape through steering direction, thus the beam patterns of sub-arrays are always non-uniform. In this paper, we apply the beam pattern synthesis method using convex optimization into the conformal array, and shows the improvement of uniformity of beam performance. The simulation is performed with the conformal array of cut-sphere shape. As a result, the standard deviation of 3 dB beamwidth in elevation is greatly reduced but the directivity index is also reduced. To alleviate this trade-off, we propose a convex optimization using a shading function.

Keywords

Conformal array sonar

Convex optimization

Array pattern synthesis

Weighting coefficient

임의의 곡면 배열에서 단위 빔 형성에 사용되는 부배열은 조향 방위마다 기하학적 형상이 다르다. 이 때문에 조향 방위 별 부배열의 빔 패턴은 항상 균일하지 않다. 본 논문에서는 볼록 최적화를 이용한 빔 형성 기법을 곡면 배열에 적용하고, 조향 방위별 빔 성능의 균일성이 향상되는 것을 보였다. 시뮬레이션은 절단 구면 형상의 곡면 배열에 대해 수행되었다. 고각 3 dB 빔 폭의 표준 편차가 크게 감소하였으나 반대급부로 지향 지수도 감소하는 것을 관찰했다. 이를 완화시키기 위한 하나의 방법으로 쉐이딩 함수를 이용한 최적화 기법을 제안한다.

키워드

곡면 배열 소나

볼록 최적화

빔 형성

센서 가중치

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Information

Publisher :The Acoustical Society of Korea
Publisher(Ko) :한국음향학회
Journal Title :The Journal of the Acoustical Society of Korea
Journal Title(Ko) :한국음향학회지
Volume : 41
No :6
Pages :637-646
Received Date : 2022-07-29
Revised Date : 2022-09-02
Accepted Date : 2022-11-07
DOI :https://doi.org/10.7776/ASK.2022.41.6.637

The Journal of the Acoustical Society of KoreaISSN:1225-4428(Print) 2287-3775(Online)한국음향학회

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