摘要
以激光雷达领域中的多目标探测为应用背景,提出硅基光波导光学相控阵多光束形成方法,介绍光波导光学相控阵的工作机理。在光束偏转原理的基础上,采用子孔径法将总孔径阵列按需划分为多个连续的子孔径,光束经过各子孔径后会受到不同的相位调制,最终在出射端形成多个可偏转至不同角度的光束;根据目标的威胁程度,调整子孔径的阵元数目并对多光束进行均匀或非均匀划分,实现各光束能量的合理分配。仿真结果表明,远场衍射图案在期望的角度上出现预先设置比例的多个光束,验证该方法的可行性和有效性,而且该方法可极大地增加相控阵激光雷达的目标探测数目,缩短扫描时间。
Based on the background of multitarget detection in the lidar field,a multibeam formation method for a silicon-based optical waveguide phased array is proposed and the working mechanism of the optical waveguide phased array is introduced. Based on the principle of beam deflection,the total aperture array is divided into several continuous subapertures by the subaperture method. After passing through each subaperture,the beam will be subjected to different phase modulation. Finally,various beams that can be deflected through different angles are formed at the exit end. According to the target threat degree,the number of array elements of the subaperture is adjusted and the multiple beams are divided uniformly or non-uniformly. Then,the energy of each beam can be reasonably distributed. Simulation results show that the far-field diffraction pattern appears at the desired angle,verifying the feasibility and effectiveness of the proposed method. Besides,the proposed method can significantly increase the number of targets detected by a phased array lidar and reduce the scanning time.
作者
周恒超
王春阳
王子硕
刘雪莲
肖博
Zhou Hengchao;Wang Chunyang;Wang Zishuo;Liu Xuelian;Xiao Bo(Key Laboratory of Information Perception and Intelligent Control,Xi’an Technological University,Xi’an,Shaanxi 710021,China;College of Electronic and Information Engineering,Changchun University of Science and Technology,Changchun,Jilin 130022,China;College of Optoelectronic and Engineering,Xi'an Technological University,Xi’an,Shaanxi 710021,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2021年第11期328-335,共8页
Laser & Optoelectronics Progress
基金
中国博士后科学基金(2020M673606XB)。
关键词
光学器件
光波导
光学相控阵
多光束
子孔径
相位调制
optical devices
optical waveguide
optical phased array
multibeam
subaperture
phase modulation
