LI Qihu

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

Revised Aug. 30, 2006

Abstract  The directivity function of twin-line array sonar can be used to identify left/right target. But the performance is limited by the distance between two lines and also exists the blind area for target identification. A method, which is based on the time-delay estimation between two line arrays, is proposed to identify left/right target. The method is robust with the variation of distance between two line array, the blind area is considerable decreased. The theoretical analysis results and realization method is described. An algorithm base on interpolation method for precisely estimating time-delay of two line array are derived, therefore the left-right ambiguity problem is solved.　

PACS number: 43.60