Trajectory Reconstruction of Hayabusa's Atmospheric Reentry
Trajectory Reconstruction of Hayabusa's Atmospheric Reentry
复制标题
隼鸟再入大气层轨迹重建
DOI：
10.1016/j.actaastro.2011.08.006
复制
发表时间：
2012
影响因子：
3.5
通讯作者：
et al
中科院分区：
文献类型：
--
作者：
M.Shoemaker;et al
日本宇宙航空研究开发机构的隼鸟任务于 2010 年 6 月 13 日结束，主航天器和小行星样本返回舱按计划重返大气层。这些物体在夜间重新进入大气层，在澳大利亚沙漠伍默拉禁区上空形成明亮的火球。主航天器在大气层中解体，太空舱名义上重新进入并在距离目标着陆点约1公里处着陆。本文描述了所做的工作： 操作光学测量系统来观察再入；识别胶囊；并使用扩展卡尔曼滤波器（EKF）估计胶囊的轨迹。测量结果包括来自地面摄像机光学测量的单位视线矢量。使用该系统，可以在大约 52 至 37 公里高度处将太空舱与主要航天器碎片区分开来。本文描述的初步飞行后轨迹重建结果与标称轨迹非常吻合。标称轨迹和估计轨迹之间的位置（速度）差异在测量范围内平均约为 2km (200m/s)。由于存在 10−3rad 量级的测量偏差，EKF 的状态误差协方差被低估；讨论了这些测量偏差的几个可能原因。
The Hayabusa mission of the Japan Aerospace Exploration Agency ended on 13 June, 2010, with the planned atmospheric reentry of the main spacecraft and asteroid sample return capsule. These objects reentered the atmosphere at night, creating bright fireballs in the sky over the Woomera Prohibited Area in the Australian desert. The main spacecraft disintegrated in the atmosphere, and the capsule reentered nominally and landed approximately 1km from its targeted landing point. This paper describes the work that was done to: operate an optical measurement system to observe the reentry; identify the capsule; and estimate the capsule's trajectory using an Extended Kalman Filter (EKF). The measurements consisted of unit line-of-sight vectors from optical measurements from ground-based cameras. Using this system, the capsule was distinguishable from the main spacecraft fragments from approximately 52 to 37km altitude. The preliminary post-flight trajectory reconstruction results described in this paper agree closely with the nominal trajectory. The position (velocity) difference between the nominal and estimated trajectories is approximately 2km (200m/s) averaged over the measurement span. The state error covariances from the EKF are underestimated because of the presence of measurement biases on the order of 10−3rad; several likely causes for these measurement biases are discussed.