等效阵长对声压线阵声呐空间增益的影响分析

Impact analysis of equivalent array length on spatial gain of pressure hydrophone array sonar

为了研究声压线阵声呐空间增益的影响因素,就同等阵元个数情况下线阵声呐等效阵长与波束形成结果的关系进行仿真分析。首先,建立了直线阵、圆阵、半圆阵和太极阵的声压线阵声呐模型,定义了线阵声呐等效阵长的数学表达式,对线阵声呐等效阵长的进行了对比分析。其次,引入"–3d B波束宽度"概念,通过蒙特卡罗试验,得出了线阵声呐等效阵长与"–3d B波束宽度"之间的反比关系。最后,对多目标情况下的波束形成仿真结果进行对比分析,验证了等效阵长对线阵声呐空间增益的影响关系。

The simulation analysis of relationship between beam forming results and equivalent array length of array sonar has been done, in order to study the factors that influence spatial gain of pressure hydrophone array sonar with a fixed number of arrays. Firstly, the array sonar models of linear array, circle array, semicircular array and tai-ji array have beenes-tablished. The mathematical expression of equivalent array length is defined and the comparison has been done. Secondly, the conception of –3 dB beam width is defined. The inverse relationship between equivalent array length and –3 dB beam width is obtained through the Monte-Carlo experiments. Finally, the results of beam forming simulation with multipleobject-ive are contrasted and the relationship between spatial gain and equivalent array length is affirmed.