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针对指向性误差对自由空间光通信系统性能的影响如误码率以及传统指向性误差校正技术存在的实施难度大等问题,本文在焦面上,基于指向性误差校正技术对FSO系统进行BER分析。首先,讨论了指向性误差校正技术的基本原理,并得到了指向性误差与FSO系统BER之间的关系,设计了一种PID闭环控制算法。其次,搭建了基于PID算法的闭环控制系统,并进行了相关实验。实验结果表明:针对不同大气湍流扰动强度的FSO系统,所述指向性误差校正方法和PID闭环控制算法均具有较好的效果,其中弱扰动情况下的改善效果尤其明显。
In view of the influence of directional error on the performance of free space optical communication system such as the bit error rate and the difficulty in implementing the traditional directional error correction technique, this paper presents a BER analysis of the FSO system based on the directional error correction technique . First of all, the basic principle of directional error correction technology is discussed, and the relationship between directivity error and FSO system BER is obtained. A PID closed-loop control algorithm is designed. Secondly, a closed-loop control system based on PID algorithm is set up and related experiments are carried out. The experimental results show that both the directional error correction method and PID closed-loop control algorithm have a good effect on the FSO system with different atmospheric turbulence disturbances, especially in the case of weak disturbance.