光子学报 ›› 2020, Vol. 49 ›› Issue (10): 1001002-1001002.doi: 10.3788/gzxb20204910.1001002

• 大气与海洋光学 • 上一篇    下一篇

基于水下光斑跟踪的接收机对准系统

贺锋涛(), 李思静, 杨祎, 张建磊   

  1. 西安邮电大学 电子工程学院,西安 710121
  • 收稿日期:2020-06-30 接受日期:2020-08-25 出版日期:2020-10-25 发布日期:2020-10-13
  • 作者简介:贺锋涛(1974—),男,副教授,博士,主要研究方向为水下无线光通信、激光散斑传感、成像方向. Email: hefengtao@xupt.edu.cn
  • 基金资助:
    国家自然科学基金(61805199);陕西省技术创新引导专项基金(2020TG-001);西安邮电大学研究生联合培养工作基地(YJGJ201905);国防基础科研计划实验室稳定支持专题项目(JCKY2020207CD02)

Receiver Alignment System Based on Underwater Spot Tracking

Feng-tao HE(), Si-jing LI, Yi YANG, Jian-lei ZHANG   

  1. School of Electronic Engineering,Xi'an University of Posts and Telecommunications,Xi'an 710121,China
  • Received:2020-06-30 Accepted:2020-08-25 Online:2020-10-25 Published:2020-10-13
  • Supported by:
    National Natural Science Foundation of China(61805199);Shaanxi Provincial Special Fund for Technology Innovation Guidance(2020TG-001);Xi'an University of Posts and Telecommunications Joint Graduate Training Base(YJGJ201905);National Defense Basic Research Program Laboratory Stable Support Special Project(JCKY2020207CD02)

摘要:

针对水下无线激光通信中光斑易变形、易受湍流影响和易被遮挡的问题,采用均值漂移与无迹卡尔曼滤波器结合阈值判断的跟踪光斑算法,获取跟踪光斑实时位置坐标.分析得到光斑在被遮挡、变形和受湍流影响时,实际移动轨迹和跟踪移动轨迹的误差分别在 2.1%、4% 和1.2%左右,验证了算法的可行性.搭建接收机对准系统,利用跟踪光斑实时位置和中心位置的关系,控制接收机和发射机的实时对准.通过对比对准系统获得光斑的实际中心坐标和严格对准时光斑中心坐标之间的偏差,来反映系统的对准精度,实验结果发现接收机的运动角速度越大,对准精度越小.

关键词: 水下无线光通信, 跟踪对准, 均值漂移, 无迹卡尔曼滤波器, 控制系统

Abstract:

Aiming at the problem that the light spot in underwater wireless laser communication is easily deformed, susceptible to turbulence and to be blocked, firstly, the tracking light spot algorithm of Mean Shift combined with unscented Kalman filter and threshold judgment is used to obtain the real-time position coordinates of the tracking light spot. The analysis results show that when the light spot is blocked, deformed or affected by turbulence, the error between actual movement trajectory and tracking movement trajectory are about 2.1%, 4%, and 1.2%, respectively, which verifies the feasibility of the algorithm. A receiver alignment system is built to track the real-time position of the light spot. The real-time alignment of the receiver and transmitter is controlled based on the relationship of the real-time position and the center position. The alignment accuracy of the system is reflected by the deviation between the actual center coordinates and the center coordinates of the light spot obtained by comparing the alignment system. The experiment results show that the greater the angular velocity of the receiver's motion, the smaller the alignment accuracy.

Key words: Underwater wireless optical communication, Tracking alignment, Mean shift, Unscented Kalman filter, Control system

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