Smart dust option for geomagnetic tail exploration

被引:0
作者
Alessandro A. Quarta
Giovanni Mengali
Lorenzo Niccolai
机构
[1] University of Pisa,Department of Civil and Industrial Engineering
来源
Astrodynamics | 2019年 / 3卷
关键词
smart dust; femto solar sail; electrochromic control system; geomagnetic tail exploration;
D O I
暂无
中图分类号
学科分类号
摘要
In-situ measurements are necessary for a long-term analysis of the spatial structure of the geomagnetic tail. This type of mission requires the use of a propellantless propulsion system, such as a classical solar sail, to continuously rotate the design orbit apse line such that it remains parallel to the Sun-Earth direction. To reduce the mission costs, this paper suggests the employment of Sun-pointing smart dusts, which are here investigated in terms of propulsive acceleration level necessary to guarantee a mission’s feasibility. A Sun-pointing smart dust can be thought of as a millimeter-scale solar sail, whose geometric configuration allows it to passively maintain an alignment with the Sun-spacecraft line. The smart dust external surface is coated with an electrochromic reflective film in such a way that it may change, within some limits, its propulsive acceleration magnitude. A suitable control law is necessary for the smart dust to enable an artificial precession of its Earth-centred orbit, similar to what happens in the GeoSail mission. This paper analyzes the required control law using an optimal approach. In particular, the proposed mathematical model provides a set of approximate equations that allow a simple and effective tradeoff analysis between the propulsive requirements, in terms of the smart dust acceleration, and the characteristics of the design orbit.
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页码:217 / 230
页数:13
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