低旁瓣大扫描角多圆环光学相控阵优化设计  

Optimized Design of Multi-Circular Optical Phased Array with Low Sidelobe and Large Scanning Angle

作　　者：钟永旭 汪祥宇 谌诗洋 朱磊 Zhong Yongxu;Wang Xiangyu;Shen Shiyang;Zhu Lei(Chongqing Institute of Green and Intelligent Technology,Chinese Academy of Sciences,Chongqing 400714,China;Chongqing School,University of Chinese Academy of Sciences,Chongqing 400714,China;Institute of Optics and Electronics,Chinese Academy of Sciences,Chengdu 610209,Sichuan,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院重庆绿色智能技术研究院,重庆400714 [2]中国科学院大学重庆学院,重庆400714 [3]中国科学院光电技术研究所,四川成都610209 [4]中国科学院大学,北京100049

出　　处：《激光与光电子学进展》2024年第21期325-334,共10页Laser & Optoelectronics Progress

基　　金：国防科技创新特区探索基金、163计划。

摘　　要：为了实现大角度低旁瓣的光束扫描,基于改进遗传算法和凸优化算法,对阵元位置以及阵元激励进行组合优化,设计了一种相邻阵元最小间距为18μm、工作波长为1550 nm的多圆环光学相控阵。优化过程分为两个步骤:首先对遗传算法进行改进,在特定俯仰角范围内优化环间距分布,从而在大扫描角范围内实现较低的峰值旁瓣电平;在此基础上,使用凸优化算法优化不同指向角下阵元的激励幅值分布,进一步降低峰值旁瓣电平。通过该组合优化,实现了俯仰方向为-45°~45°、水平方向为0°~360°的扫描范围,峰值旁瓣电平达到了-20.47 dB,最大远场发散角为0.146°。为验证算法的有效性,研制了含64个阵元的小规模多圆环光学相控阵,并搭建实验系统进行试验验证,实验结果与算法优化结果相符。To realize wide-range optical beam scanning with low sidelobes,we design a multi-circular optical phased array with a minimum spacing of 18μm between adjacent array elements and an operating wavelength of 1550 nm by optimizing the position of the array elements and the excitation of the array elements using a modified genetic algorithm and a convex optimization algorithm.The optimization is performed in two steps:first,the genetic algorithm is improved to optimize the distribution of ring spacing at a specific elevation angle,which yields a low peak sidelobe level over a wide beam steering range;subsequently,the excitation-amplitude distribution of the array elements is optimized using the convex optimization algorithm for different steering angles,which further reduces the peak sidelobe level.Using this combined optimization,scanning ranges of-45°to 45°and 0°to 360°are achieved in the elevation and azimuth directions,respectively,and the peak sidelobe level reduced to-20.47 dB,with a maximum far-field divergence angle of 0.146°.To verify the effectiveness of the algorithm,a small-scale multi-circular optical phased array containing 64 array elements is developed,and an experimental system is constructed for experimental verification.The experimental results are consistent with the optimization results of the algorithm.

关 键 词：光学相控阵 多圆环阵列 峰值旁瓣电平 改进遗传算法 凸优化算法 

分 类 号：TN958.92[电子电信—信号与信息处理]