【摘要】 为降低便携式三维成像声纳系统的硬件开销,同时保证阵列的波束性能,提出了一种非网格化阵列稀疏方法.该方法基于十字型阵列,在模拟退火算法中加入阵元位置扰动,以实现对十字型阵列的非网格稀疏优化,降低阵元数量;引入多频发射和并行子阵接收波束形成算法,构建模拟退火算法中新的能量函数,以保证十字型稀疏阵列具有成像实时性以及较低的计算需求.最后利用该方法对100+100的十字型阵列进行稀疏优化.实验结果表明,该方法获得的非网格化稀疏阵列能够获得预设的波束性能,并具有成像的实时性和较低的计算需求;与现有文献相比,在保持相同波束性能的条件下,该稀疏阵列具有最少的阵元数量.更多还原

【Abstract】 A nongrid sparse array optimization method was proposed to reduce the hardware cost of the portable 3 D imaging sonar system and guarantee the performance of beam pattern of the array. Based on the cross array, the ele-ment position perturbation was introduced into the simulation annealing(SA) algorithm to achieve the nongrid sparse optimization for the cross array and decrease the element number. Based on multiple-frequency transmitting beamforming and parallel subarray receiving beamforming algorithms, a new energy function for the SA algorithm was defined to make the sparse cross array has a real-time imaging property and lower computational requirement. Finally, the proposed method was employed to optimize a cross array with 100+100 elements. The experiment results demonstrate that the nongrid sparse array obtained by the proposed method can achieve the presupposed beam pattern performance and own real-time imaging property and low computational requirements. Compared with the existing literature, the sparse array has the fewest active elements while maintaining the same beam pattern perfor-mances.更多还原