Using the attitude response of aerostable spacecraft to measure thermospheric wind

Josep Virgili Llop, Peter Roberts, Zhou Hao

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    Abstract

    In-situ measurements of the thermospheric wind can be obtained by observing the attitude response of an aerostable spacecraft. In the proposed method, the aerostable spacecraft is left uncontrolled, freely reacting to the aerodynamic torques, and oscillating around its equilibrium attitude. The wind's magnitude
    and direction is determined by combining the attitude observations with estimates of the other perturbing torques, atmospheric density, and spacecraft's
    aerodynamic properties. The spatial resolution of the measurements is proportional to the natural frequency of the attitude's oscillation. Spacecraft with high aerodynamic stiness to inertia ratios operating at low altitudes exhibit higher natural frequencies, making them particularly suited for this method. A one degree-offreedom case is used to present and illustrate the proposed
    method as well as to analyze its performance.
    Original languageEnglish
    Pages (from-to)1-13
    Number of pages13
    JournalCEAS Space Journal
    Early online date9 Jun 2017
    DOIs
    Publication statusPublished - 2017

    Keywords

    • thermospheric wind
    • Estimation
    • spacecraft aerodynamics

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