阵形畸变对拖曳双线阵左右舷分辨性能的影响

Effects of shape distortion upon left/right discrimination of towed twin-line array

分析了阵形畸变对拖曳双线阵左右舷分辨性能的影响。首先由双线阵指向性函数及左右舷抑制比公式,推导并定义了双线阵声呐实现左右舷分辨的两个关键参量——特征方位和特征频率。然后在引入阵形畸变量的基础上,利用阵形畸变时的左右舷抑制比公式,进一步推导得到特征方位及特征频率关于阵形畸变量的解析关系式。理论分析、仿真结果以及海上试验数据都表明,阵形畸变会改变特征方位和特征频率,造成拖曳双线阵左右舷分辨性能下降甚至再次产生左右舷模糊。

Effects of the distortion upon left/right discrimination of towed twin-line array were analyzed. Two key parameters, the characteristic bearing and characteristic frequency, were derived and defined according to the directivity and the gain of left/right suppression of twin-line array, which determine the performance of left/right discrimination of towed twin-line array. A shape distortion variable was called to formulate the left/right suppression ratio under shape distortion, and the functional relationship between the two key parameters and the shape distortion variable was established. Theoretical analysis and simulation results reveal that the characteristic bearing and characteristic frequency are deviated from original location under shape distortion, resulting in the performance degradation of the sonar left/right discrimination, and even worse bearing ambiguity would appear again. And the sea trial data verified this.