FSO中基于最大弦长定位算法的激光中心定位技术  

Laser Center Positioning Technology Based on Maximum Chord Length Positioning Algorithm in FSO

作　　者：陈学恒 洪燕青 宗文昊 刘楠[1] 王海亮 CHEN Xueheng;HONG Yanqing;ZONG Wenhao;LIU Nan;WANG Hailiang(Shenyang University of Technology,Liaoning Shenyang 110870,China;Ningbo Sunny Opotech Co,Ltd,Zhejiang Ningbo 315400,China)

机构地区：[1]沈阳工业大学,辽宁沈阳110870 [2]宁波舜宇光电信息有限公司,浙江宁波315400

出　　处：《海军航空大学学报》2025年第2期329-336,342,共9页Journal of Naval Aviation University

基　　金：2023年辽宁省教育厅面上项目(JYTMS20231214)。

摘　　要：针对自由空间光通信(Free Space Optical Communication,FSO)中传统激光定位算法,如质心法、圆拟合法、Hough法等存在定位精度较差、时间较长的问题,提出了一种最大弦长算法,以提高大气湍流信道中激光中心定位效率和FSO链路性能。算法首先对图像边缘检测后的边缘像素点进行去干扰处理,而后遍历所有边缘像素点,计算它们之间的距离,并对距离最远的每两像素点的中点累加计数,最后选出累计次数最多的中点作为中心,从而实现对激光中心的精确定位。通过与传统激光定位算法的仿真对比表明:最大弦长定位算法能有效降低激光中心的偏移量,提高定位精度,同时本算法能缩短检测过程的计算时间,提高定位效率,且在相同面积的激光中心掩膜内,本文算法包含的总像素强度更大,综合定位效果更好。Traditional laser center positioning algorithms,such as the centroid method,circle fitting method,and Hough transform have the disadvanteges of poor positioning accuracy and long times consumption in Free Space Optical Communication(FSO)system.Therefore,a maximum chord length algorithm to improve the efficiency of laser center positioning and the performance of FSO links in atmospheric turbulence channel is proposed.Firstly,the proposed algorithm conducts de-interference process on the edge pixels obtained from edge detection,and it traverses all edge pixels to calculate the distances between edge and other pixels.Then,the midpoint of each of the two farthest pixels is calculated and accumulated.Finally,the midpoint with the highest number of accumulation is voted as the laser center to realize a precise positioning.The proposed method is compared with laser center positioning algorithms in simulation.The simulation results show that the proposed algorithm can effectively improve the positioning accuracy by reducing the offset of laser center.Additionally,it can enhance the positioning efficiency via decreasing the computational time during the detection process.Furthermore,the proposed algorithm can capture a higher amount of pixels within the same area of laser center mask,which can lead to a better positioning performance overall.

关 键 词：自由空间光通信 大气湍流 相位屏 激光中心定位 

分 类 号：TN929.1[电子电信—通信与信息系统]