Galileo spacecraft autonomous attitude determination using a V-slit star scanner

S. Mobasser, S. Lin
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引用次数: 1

Abstract

Absolute attitude determination and the rotor spin rate of the Galileo spacecraft are derived solely from a two-axis star scanner, (SS) that is sensitive (outside the Jovian magnetosphere) to at least 200 brightest stars. With the 200-star sensitivity, the SS always provides at least three stars for attitude determination anywhere in the spacecraft orbit. Because the SS must function in the intense Jupiter radiation environment, which consists primarily of high-energy electrons and photons, the Galileo SS is designed with radiation hardness as a prime objective. The Galileo SS is described together with an entirely autonomous attitude determination algorithm. The SS analytical model is also presented. The selection process for the model's critical parameters which are used by the attitude determination algorithm is explained. Post launch operation of the attitude determination algorithm is discussed and actual flight data are presented.<>
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使用v缝星扫描器的伽利略航天器自主姿态确定
伽利略号航天器的绝对姿态测定和转子自旋速率仅来自一台双轴恒星扫描器(SS),该扫描器(在木星磁层外)对至少200颗最亮的恒星很敏感。凭借200颗星的灵敏度,SS在航天器轨道上的任何位置都至少提供3颗星的姿态确定。由于SS必须在强烈的木星辐射环境中工作,该环境主要由高能电子和光子组成,因此伽利略SS的设计以辐射硬度为主要目标。描述了伽利略SS和一个完全自主的姿态确定算法。提出了SS分析模型。阐述了姿态确定算法所使用的模型关键参数的选取过程。讨论了姿态确定算法的发射后操作,并给出了实际飞行数据。
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