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On-orbit beam pointing calibration for nanosatellite laser communications

机译：纳米卫星激光通信的轨道梁指向校准

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摘要

We describe techniques developed to optimize beam pointing control for a CubeSat laser downlink demonstration mission being developed at the MIT Space Telecommunications, Astronomy, and Radiation Laboratory. To fine-point its downlink beam, the mission utilizes an uplink beacon signal at 976 nm captured by an on-board ±5-deg field-of-view detector and tracked by a 3.6-mm commercial, off-the-shelf MEMS fast steering mirror. As these miniature actuators lack feedback sensors, the system design is augmented with an optical calibration signal to provide the mirror's pointing feedback. We describe the system and introduce calibration algorithms utilizing the feedback signal to achieve higher fidelity beam pointing control. A demonstration in the laboratory is conducted to obtain a quantitative performance analysis using quasi-flight hardware with simulated spacecraft body pointing disturbances. Experimental results show that beacon tracking errors of only 16 μrad root-mean-square are feasible for both axes, significantly exceeding the mission pointing requirement of 0.65 mrad and indicating the feasibility of narrower beams and higher data throughputs for next-generation downlink demonstration missions. laser communications; calibration; pointing; tracking.
机译：我们描述了在MIT空间电信，天文学和辐射实验室开发的CubeSat激光下行链路示范特派团进行Cubesat激光下行链路示范特派团的光束指向控制的技术。为了细微的下行链路光束，该任务在由车载±5°视野视图检测器捕获的976nm处的上行链路信标信号使用3.6 mm商业，从架子MEMS快速跟踪转向镜。由于这些微型执行器缺少反馈传感器，系统设计以光学校准信号增强，以提供镜子的指向反馈。我们描述了系统并利用反馈信号来引入校准算法以实现更高的保真光束指向控制。进行实验室的示范，以使用模拟航天器身体指向扰动的准飞行硬件来获得定量性能分析。实验结果表明，两轴仅为16μR根均值的信标跟踪误差是可行的，这两个轴都是可行的0.65mRad的任务指向要求，并指示下一代下行链路示范任务的较窄梁的可行性和更高的数据吞吐量。激光通信;校准;指示;追踪。

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  • 来源
    《Optical engineering》 |2019年第4期|041605.1-041605.8|共8页
  • 作者

    Ondrej Cierny; Kerri L. Cahoy;

  • 作者单位

    Massachusetts Institute of Technology Space Telecommunications Astronomy and Radiation Laboratory Department of Aeronautics and Astronautics Cambridge Massachusetts United States;

    Massachusetts Institute of Technology Space Telecommunications Astronomy and Radiation Laboratory Department of Aeronautics and Astronautics Cambridge Massachusetts United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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