中文摘要：

阵形畸变对双线阵左右舷分辨性能有重要影响.本文针对一种典型的张角畸变展开深入分析.首先设定了畸变量,推导出左右舷抑制增益关于该畸变量的函数关系,进而分析该畸变量对双线阵声纳左右舷分辨两个重要性能指标——特征方位和特征频率的影响,同时对于两种常用的左右舷分辨方法在此种畸变情况下的性能也进行了深入讨论.仿真结果显示,此种畸变严重抑制了正横方位的左右舷分辨性能,甚至会形成误判,并且基于时延估计的左右舷分辨方法和基于双线阵指向性的常规方法都将产生较大误差,需校正后才能应用.

英文摘要：

Shape distortion may deteriorate the left/right discrimination performance of twin-line array sonar.A typical shape distortion was discussed where the twin lines of sonar deviate from the axial direction.A distortion variable was defined,and the function relation between the left/right suppression ratio and the variable was deduced.Then the characteristic bearing and the characteristic frequency,two important performance indexes,were calculated to analyze the influence created by the shape distortion.Also the performance of several traditional left/right discrimination methods were discussed under the situation of shape distortion.Simulation results showed that this typical shape distortion had great affects on the discrimination performance of twin-line array sonar,especially on the beam bearing,where the discrimination results may be contrary to the real state.The time delay method and the conventional method based on twin-line array directivity would lose their precision to some extent,and modification was necessary.