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Laser Reference Sensor Alignment Tracking and Star Observations

机译：激光参考传感器对准跟踪和恒星观测

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摘要

The laser reference sensor is the central instrument in the Ice, Cloud, and land Elevation Satellite 2 laser pointing knowledge system, simultaneously observing stars and the altimetry laser in a single instrument coordinate frame. The star observations are relatively sparse, with a predicted brightness cutoff near visual magnitude 5, and their density varies significantly across the sky. There are star gaps of up to approximately 200 s, and areas of the sky with 20 simultaneously observable stars. The star observations are augmented with observations from two spacecraft star trackers using an alignment filter. The filter tracks the motion of the laser reference sensor relative to the spacecraft Monte Carlo simulation is used to characterize the effects of various magnitude cutoffs, types of alignment variations, and regions of the sky on alignment tracking and overall pointing knowledge performance. Multiple model adaptive estimation is used to map alignment process noise filter tuning with respect to the input parameters. The results include pointing knowledge uncertainty predictions over an input parameter space of three star brightness cutoffs, two types of alignment variations, and three alignment variation amplitudes. The results also map pointing uncertainty to regions of the sky and individual stars.
机译：激光参考传感器是冰，云和陆地海拔卫星2激光指向知识系统中的中心仪器，可在单个仪器坐标系中同时观测恒星和高程激光。恒星的观测相对稀疏，其预测的亮度截止值接近视觉强度5，并且其密度在整个天空中变化很大。存在大约200 s的恒星间隙，并且在天空区域中同时可见20个恒星。使用对准滤镜，通过两个航天器恒星跟踪仪的观测值来增强恒星观测值。滤波器跟踪激光参考传感器相对于航天器的运动。蒙特卡罗模拟用于表征各种幅度截止，对准变化类型以及天空区域对对准跟踪和总体指向知识性能的影响。多模型自适应估计用于相对于输入参数映射对齐过程噪声滤波器调整。结果包括在输入参数空间上的三个恒星亮度临界值，两种类型的对准变化和三个对准变化幅度的指向性知识不确定性预测。结果还映射了指向天空和单个恒星区域的不确定性。

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  • 来源
    《Journal of Spacecraft and Rockets》 |2014年第6期|1836-1848|共13页
  • 作者

    Noah H. Smith; Sungkoo Bae; Bob E. Schutz;

  • 作者单位

    University of Texas at Austin, Austin, Texas 78712;

    University of Texas at Austin, Austin, Texas 78712;

    University of Texas at Austin, Austin, Texas 78712;

  • 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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