作　　者： (于涤非）; (黄海宁）; (张春华）; (吴长瑞）;

机构地区： 中国科学院声学研究所,北京100190 中国科学院大学,北京100190

出　　处： 《电子与信息学报》 2017年第9期2175-2181,共7页

摘　　要： 为解决传统均匀FFT波束形成算法引起的3维声呐成像分辨率降低的问题,该文提出分区域FFT波束形成算法。远场条件下,以保证成像分辨率为约束条件,以划分数量最少为目标,采用遗传算法作为优化手段将成像区域划分为多个区域。在每个区域内选取一个波束方向,获得每一个接收阵元收到该方向回波时的解调输出,以此为原始数据在该区域内进行传统均匀FFT波束形成。对FFT计算过程进行优化,降低新算法的计算量,使其满足3维成像声呐实时性的要求。仿真与实验结果表明,采用分区域FFT波束形成算法的成像分辨率较传统均匀FFT波束形成算法有显著提高,且满足实时性要求。 In order to solve the problem that traditional uniform FFT beamforming algorithm reduces the resolution of 3-D sonar imaging, this paper presents a sub-region FFT beamforming algorithm. In the far field, the imaging area is partitioned into multiple regions using genetic algorithm as the optimization method. The objective of the optimization process is to minimize the number of partitions, with the constraints being the imaging resolution. In each region, a beam direction is selected to obtain the demodulated output when each receiving element receives the directional echo as the original data, and the traditional uniform FFT beamforming is performed in the region. The FFT computation process is optimized to reduce the computational complexity of the new algorithm to meet the real-time requirements of 3D imaging sonar. Simulation and experimental results show that the imaging resolution Of the sub-region FFT beamforming algorithm is significantly higher than that of the traditional uniform FFT beamforming algorithm, and satisfies the reai-time requirement.

关 键 词： 水声学 维成像声呐 波束形成 成像分辨率