数字多波束声呐的一种内插算法

An Interpolation Algorithm of Digital Sonar System

数字多波束声响的每一波束具有固定指向．为了在空间域得到较高的分辨力，减少声呐设计中的硬件开销，波束成形后的内插是十分必要的．本文基于抛物线三点与五点内插的原理，提出一种简单易行，精度较高的波束内插算法，并以直线阵和圆弧阵为例，说明这种算法的实现方法。实际计算机模拟结果表明，本文提出的算法可以改善多波束系统的指向特性，提高对目标的分辨精度．

In the multi-beam digital sonar, each beam has fixed bearing direction. In order to obtain higher spacial resolution and reduce the hardware cost, it is necessary to make some kind of interpolation algorithm in post beam forming. Based on the principle of parabolic three-point and five-point interpolation, a simple,precise beam interpolation technique is presented in this paper. The realization of this method, for which the line aud the circle arrays are taken as examples, is ilIustrated. The system simulation results show that the method described in this paper can be used to improve the directivity and enhance the resolving ability of the multi-beam sonar system.