激光外差探测阵列互相关相干累积法  

Array Phase Compensation Cross-correlation Method For Laser Heterodyne Detection

作　　者：李静 李铁[1,2] 李岗 胡文惠 李伟 李抟 LI Jing;LI Tie;LI Gang;HU Wenhui;LI Wei;LI Tuan(Xi’an Institute of Mechanical and Electrical Information Technology,Xi’an 710065,China;Science and Technology on Electromechanical Dynamic Control Laboratory,Xi’an 710065,China)

机构地区：[1]西安机电信息技术研究所,陕西西安710065 [2]机电动态控制重点实验室,陕西西安710065

出　　处：《探测与控制学报》2024年第1期17-22,27,共7页Journal of Detection & Control

摘　　要：针对粗糙目标导致本振光与信号光波前失配这一技术难题,提出一种基于序列移位与互相关的用于检测微弱外差信号的相干累积法。该方法利用阵列探测器的阵列信号进行互相关运算,将外差信号频谱幅值作为目标函数,快速准确地估计最佳序列偏移量和计算相位调整量,搭建了一套基于高速摄像机阵列探测器的光外差探测系统。仿真分析和实验结果表明,该方法应用于主动光外差探测领域时对相位补偿的精确度更高,信号处理时间可提高到毫秒量级。Aiming at the technical problem of the wavefront mismatch between the local oscillator and signal light caused by rough targets,a coherent accumulation method based on sequence shifting and cross-correlation was proposed to detect weak heterodyne signals.Of this method,the output of the array signal was used to perform cross-correlation calculation,and the spectrum amplitude of heterodyne signal was taken as the objective function,quickly and accurately estimate the best sequence offset and solve the phase adjustment,an experimental system of array detector based on high-speed camera was built.Simulation analysis and experimental verification showed that the proposed method was more accurate to phase compensation when applied to active optical heterodyne detection,and signal processing time was improved to millisecond level.

关 键 词：外差探测 阵列探测器 互相关 相位补偿 

分 类 号：TN24[电子电信—物理电子学]