摘要： 高精度三维成像声呐的实现需要完成大规模信号同步采集和海量数据并行计算，为此，提出基于现场可编程逻辑门阵列的并行计算系统。在使用同源时钟的前提下，利用Spartan-3对平面阵2304路换能器信号进行同步采样，通过离散傅里叶变换降采样以减小采样数据规模，采用Virtex-5重新计算换能器权重以降低运算量，使用分步的波束形成算法以减小系统所消耗的存储器规模，同时在PC上实现三维图像实时显示。实验结果证明了该系统的可行性。

关键词: 三维声呐, 声学成像, 波束形成, 现场可编程门阵列

Abstract: In order to achieve synchronous acquisition of large-scale signals and parallel computing in high-resolution three-dimensional acoustic imaging system, a parallel computing system based on Field Programmable Gate Arrays(FPGA) is presented. The system uses Spartan-3 to synchronize 2 304-channel sensors at a unique clock. The sampled data are downsampled using discrete fourier transform to reduce data volume. The weights of the sensor array are optimized by Virtex-5 to decrease the calculation complexity. Step-beam forming algorithm is adopted to reduce the memory requirement. It realizes real-time three-dimensional image displaying on PC. Experimental result certifies the feasibility of this system.

Key words: 3D sonar, acoustic imaging, beamforming, Field Programmable Gate Array(FPGA)

中图分类号: 

• TB56