LI Qihu

(Institute of Acoustics, The Chinese Academy of Sciences Beijing 100080)

Revised Aug. 30, 2006

Abstract  It is well known that the single line array sonar can't identify whether the target comes from left or right. Multi-line array provides the possibility to solve the left-right ambiguity problem. The performance of left-right resolution for twin-line array is described in this paper. It is shown that the suppression ratio, which is defined as the ratio of the response in the steering direction to opposite symmetrical direction, can be considered as an index for evaluating the ability of solving left-right ambiguity. The characteristics of suppression ratio are discussed. The theoretical expression for suppression ratio and some numerical results are illustrated. The result of theoretical analysis can be used in design of twin-line array sonar.

PACS number: 43.60