光子学报, 2020, 49 (4): 0406003, 网络出版: 2020-04-24   

基于EKF的水下LD通信精对准控制算法 下载: 545次

Alignment Control Algorithm of Underwater LD Communication Based on EKF
作者单位
西安邮电大学 电子工程学院, 西安 710121
摘要
高速激光通信中接收机与光斑中心很难处于精对准状态,导致水下光通信链路难以稳定建立.首先采用蒙特卡洛仿真统计法分析激光光子在海水中传输的接收光强分布规律,再通过实验对接收端的光斑图像进行采样分析,利用曲线拟合得到接收器位置与接收光强的关系.仿真与实验结果表明:光束经过25 m的水下传输,接收光强分布仍近似为高斯分布.采用非线性估计算法(扩展卡尔曼滤波)与基本状态控制反馈理论,根据接收光强度估计接收器当前位置与最大光强处的距离,通过反馈算法实现接收端与光斑中心的主动跟踪对准.算法仿真结果显示,接收端对准误差在2 mm以下,稳定后接收效率超过98%.
Abstract
It is difficult to make receiver locating in the center of the light spot for high-speed laser communication, which results in difficultly establishing a stable underwater optical communication links. Monte Carlo simulation statistics method is used to analyze the distribution of the received light intensity of laser photons transmitted in seawater, and then the light spot image at the receiving end is sampled and analyzed through experiments, and the relationship between the receiver position and the received light intensity is obtained by curve fitting. The simulation and experimental results show that the received light intensity distribution is still approximately Gaussian distribution after 25 m underwater transmission. Based on the nonlinear estimation algorithm (extended Kalman filter) under the basic state control feedback theory, the distance between current position and position of the maximum light intensity spot is estimated according to received light intensity, and active tracking alignment between the receiver and the spot center is achieved by feedback algorithm. The simulation results show that the alignment error of the receiving end is less than 2 mm and the receiving efficiency is more than 98% after alignment.

刘豪, 杨祎, 阴亚芳, 张建磊, 李思静. 基于EKF的水下LD通信精对准控制算法[J]. 光子学报, 2020, 49(4): 0406003. Hao LIU, Yi YANG, Ya-fang YIN, Jian-lei ZHANG, Si-jing LI. Alignment Control Algorithm of Underwater LD Communication Based on EKF[J]. ACTA PHOTONICA SINICA, 2020, 49(4): 0406003.

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