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四象限探测器目前被广泛应用于空间激光通信中的对准过程,但由于大气湍流的不良影响,激光穿越大气在接收系统成像的时候,光斑产生形变以及破碎等不良影响,这严重地限制了四象限器件的对准精度。由于四象限探测自身所能提供的光斑信息较为单一,相较于CCD器件,其处理自由度较小。在分析研究基于CCD的序列光斑检测方法的理论基础之上,提出了一种基于四象限探测器的光轴对准方法。通过统计某一段时间内四象限器件所输出的脱靶量值的范围,并根据其在不同象限的分布概率计算出相应象限的熵作为加权系数,对原有计算公式进行加权计算,利用象限探测器高帧频的优势弥补原本单一的信息,从而完成对大气湍流影响的抑制作用,并搭建实验平台,最终验证该算法可以显著提高四象限器件的探测精度。
Four-quadrant detectors are now widely used in the alignment of space laser communications. However, due to the adverse effects of atmospheric turbulence, the adverse effects of laser beam traversing the atmosphere in imaging the receiving system, the spot deformation and fracturing, which severely limits Four-quadrant device alignment accuracy. Due to the single spot information provided by the four-quadrant detection itself, the degree of freedom of processing is smaller than that of a CCD device. Based on the analysis of the theory of CCD-based sequential spot detection, an optical axis alignment method based on four-quadrant detector is proposed. Through calculating the range of miss distance value output by four-quadrant device in a certain period of time and calculating the entropy of the corresponding quadrant as a weighted coefficient according to their distribution probabilities in different quadrants, the original calculation formula is weighted and the quadrant detector The advantage of high frame rate makes up for the original single information, so as to complete the suppression of the influence of atmospheric turbulence and build an experimental platform. Finally, the algorithm can significantly improve the detection accuracy of four-quadrant devices.