空间光通信中应用于精密指向的面阵探测器的定位精度分析与验证
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1.中国科学院上海技术物理研究所 空间主动光电技术重点实验室,上海 200083;2.中国科学院大学,北京 100049;3.上海科技大学 信息科学与技术学院,上海 201315;4.上海量子科学研究中心,上海 201315

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Analysis and verification of the positioning accuracy of a flat-panel detector used for precision pointing in space optical communication
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1.Key Laboratory of Space Active Opto-Electronics Technology, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China;2.University of Chinese Academy of Sciences, Beijing 100049, China;3.School of Information Science and Technology, ShanghaiTech University, Shanghai 201210, China;4.Shanghai Quantum Science Research Center, Shanghai 201315, China

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Supported by the National Natural Science Foundation of China (U1738204), the Shanghai Rising-Star Program (19QA1410400), the Key Technologies Research and Development Program (2017YFA0303900), the Youth Innovation Promotion Association of the Chinese Academy of Sciences, the Shanghai Municipal Science and Technology Major Project (2019SHZDZX01).

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    摘要:

    为了实现空间光通信中高精度的链路,本文重点研究了影响面阵探测器对于目标定位精度的关键因素。首先从机理上分析了质心算法的误差,并仿真验证了满足空间无损采样条件的必要性。我们定义了NU值并以此为指标来量化探测器的非均匀性,随着NU自0开始线性增长,质心的定位误差持续增长但是速度放缓。当NU值为0.005时,最大定位误差为0.043 pixel。在目标入射到光学系统的光强不断改变的条件下,NU值越小,质心位置越接近光斑的真实位置。我们通过实验测试了某种典型的CMOS探测器在不同光照强度下的像元响应,建立了像元响应非均匀性的数理模型,计算出NU值在线性响应范围内在0.0045到0.0048范围内波动。光斑质心定位精度的实验结果表明,绝对定位误差小于0.05 pixel,可以满足高精度链路的需求,验证了理论和仿真的有效性。

    Abstract:

    To realize a high-precision link in space optical communication, we analyzed key factors that affect the accuracy of flat-panel detectors in terms of target positioning. The error of the centroid algorithm was analyzed from the mechanism and the necessity of satisfying the spatial lossless sampling condition was verified by using a simulation. The defined NU value served as an indicator in quantifying the nonuniformity of the detector. As the NU value increased linearly, the positioning error of the centroid continued to increase, whereas the speed reduced. When the NU value was 0.005, the maximum positioning error was 0.043 pixels. Considering that the light intensity of the target incident on the optical system varies constantly, the smaller the NU value, the closer the centroid is to the true position of the light spot. Furthermore, the pixel response of a typical complementary metal oxide semiconductor (CMOS) detector was experimentally tested under different illumination intensities. Based on the response curve, a mathematical model for the nonuniformity of the pixel response was established. It can be determined that the NU value fluctuates from 0.0045 to 0.0048 within the linear response range. The experimental results of the spot centroid positioning accuracy verify that the absolute positioning error is less than 0.05 pixels, which satisfies the requirements of high-precision links. Therefore, the effectiveness of the theory and simulation presented in this study can be validated.

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  • 收稿日期:2021-09-13
  • 最后修改日期:2022-02-28
  • 录用日期:2021-10-09
  • 在线发布日期: 2022-02-28
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