Li Qihu  Li Shuqiu  Sun Changyu  Yu Huabing

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

Revised Aug. 30, 2006

Abstract  The interference characteristics of towed platform noise resulted from propeller and towed body for active/passive towed array is analyzed. It is shown that, in shallow water environment, the direct wave and bottom/sea surface reflected wave will seriously affect the performance of sonar system. The formula for calculating the direction of arrival (DOA) of interference in terms of various parameters, such as array depth, length of tow cable, is derived. The effect of interference noise for the detection performance of sonar system is described. The results of system simulation provide the method for reducing the effect of these kinds of interferences.

PACS number: 43.60