WANG Huakui LI Qihu HUANG Haining YE Qinghua LI Shuqiu ZHANG Chunhua 

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

Received Nov. 21, 2006 

Revised Jan. 31, 2007

Abstract  The performance of port/starboard discrimination of dual-line array will be seriously degraded when the space between the two line arrays of the dual-line array is mismatched. The directivity function of the delay-sum and delay-subtract beamforming is deduced and the port/starboard discrimination of the delay-sum and delay-subtract beamforming is also studied both under the ideal status and the status under which the space between the two line arrays of the dual-line array is mismatched. Analysis results show the delay-subtract beamforming has better performance of port/starboard discrimination. At last, the sea trial results demonstrate the theoretical results.

PACS number: 43.30, 43.60