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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。
The effect of line shape distortion on the performance of port-to-port discrimination of towed dual line arrays is analyzed. First of all, two key parameters of the dual-line sonar for port-starboard discrimination are deduced and defined, which are characteristic azimuth and eigenfrequency, based on the bilinear directivity and port-to-nose restraint ratio formula. Then based on the introduction of the amount of array distortion, the relationship between the characteristic azimuth and the characteristic frequency about the amount of array distortion is further deduced by using the port-to-starboard suppression ratio formula when the array distortion. Theoretical analysis, simulation results and experimental data at sea show that the formation distortion changes the characteristic azimuth and the characteristic frequency, resulting in the drop of the dual-array towed-line port-to-starboard resolution or even the port-starboard obstruction again.