中文摘要：

左右舷模糊是拖曳单线阵固有的缺陷，而拖曳双线阵具有左右舷分辨能力。本文利用双线阵的指向性函数，通过对双线阵左右舷抑制比的分析，给出使左右舷抑制比最优的特征频率，并提出一种适用于宽带信号的拖曳双线阵左右舷分辨方法。理论分析表明：当目标方位已知时，特征频率仅依赖于双阵间距，且对双阵间距变化有相当的宽容性；基于特征频率的常规波束形成使左右舷抑制比有显著改善。海试结果验证了特征频率的存在，通过对比证明了方法的有效性。

英文摘要：

Left/fight ambiguity is an inherent shortcoming for towed single-line array, while not for twin-line array. According to the analysis of left/right suppression ratio of twin-line array based on directivity function, the concept of characteristic frequency is defined which maximizes the left/right suppression ratio, and then a novel method is proposed accordingly to resolve the left/right ambiguity. The results of theoretical analysis indicate that the characteristic frequency depends only on the twin-line array spacing and possesses significant robustness when target＇s bearing is known, and the left/right discrimination method based on the characteristic frequency could improve left/right suppression significantly. Sea trial data verify the existence of the characteristic frequency and validate this method.