光轴检测模型中背景干扰分析与闪烁补偿方法探讨

Discussion on Scintillation Compensation Method and Background Interference Analysis in Optical-Axis Detection Model

为了增强四象限光电检测模型对大气环境的适应性,在大气信道二次调制的基础上对四象限光电检测模型展开了研究。首先从误差原理的角度,推导大气环境下光轴检测系统中的固有分辨精度与细分精度的关系;接着通过分析四象限光电检测系统在大气环境下受到的外界约束条件,指出信标光的信噪比和光轴偏移量是影响光轴检测系统的两个重要技术参数。在此基础上,提出在大气环境下提高光轴检测系统的固有分辨精度可以降低整个系统对大气信道的敏感度,大气信道对光轴检测的细分影响严重,如果采用较高的固有分辨精度,光轴检测精度依然可以满足激光通信光轴对准的需要。

The four-quadrant photoelectric inspection model is studied on the basis of the second atmospheric channel modulator for enhancing the four-quadrant photoelectric inspection adaptability of the atmospheric channel. Firstly, the conversion relations of natural resolution and division precision are discussed from error theory perspectives for the analysis of the axis detection system. Afterwards,through the analysis of restricted constraint condition of four-quadrant photoelectric inspection system in atmospheric channel, it is found that the signal-to-noise ratio （SNR） of the beacon light and axis offset are two main technical parameters affecting the electro-optical inspection system. Then a concept is presented that enhancing natural resolution optical-axis detection system can lower the sensitivity of the whole system to the atmospheric channel. Finally, the division precision of axis detection is found to be gravely affected by the atmospheric channel. Axis detection can still provide precision for wireless laser communication if the natural resolution of four-quadrant photoelectric inspection is enhanced.