Nie Kang, Ren Wei, Zhou Xi, Mao Yao
Key Laboratory of Optical Engineering, Chinese Academy of Sciences, Chengdu 610209, China.
Institute of Optics and Electronics, Chinese Academy of Sciences, Chengdu 610209, China.
Sensors (Basel). 2019 Sep 6;19(18):3846. doi: 10.3390/s19183846.
The stable alignment and transmission of free space optical communication (FSO) is susceptible to internal dynamics and external disturbances. In this paper, a virtual dual-loop feedback control (VDFC) with model-construction linear extended state observer (MCLESO), which is applied to the fast tip-tilt mirror platform to enhance the disturbance suppression ability (DSA) for FSO. MCLESO, which is modified on a classical linear extended state observer by introducing the available model information, is shown to use the input and output signal data of the system to observe total disturbances, including internal dynamics and external disturbance. Since the position and velocity signals are both observed only with the optoelectronic target detector and MCLESO, the controllers of the dual-loop feedback control (DFC) system are employed directly. This method has a more accurate control performance after model construction, which enhances the DSA of the tip-tilt mirror control system in low and medium frequency. It is also beneficial to miniaturization and cost saving by not using velocity sensors. Both simulations and experiments validate the effectiveness of the proposed method in the tip-tilt mirror control system under the condition of disturbance.
自由空间光通信（FSO）的稳定对准和传输易受内部动态和外部干扰的影响。本文提出一种基于模型构建线性扩展状态观测器（MCLESO）的虚拟双环反馈控制（VDFC），应用于快速倾斜镜平台，以增强FSO的干扰抑制能力（DSA）。MCLESO是在经典线性扩展状态观测器的基础上，通过引入可用模型信息进行改进的，它利用系统的输入和输出信号数据来观测包括内部动态和外部干扰在内的总干扰。由于位置和速度信号仅通过光电目标探测器和MCLESO进行观测，因此直接采用双环反馈控制（DFC）系统的控制器。该方法在模型构建后具有更精确的控制性能，提高了倾斜镜控制系统在低频和中频的DSA。不使用速度传感器也有利于小型化和节省成本。仿真和实验均验证了该方法在有干扰条件下对倾斜镜控制系统的有效性。
