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    CubeSat's attitude determination using GNSS antenna array

    Access Status
    Fulltext not available
    Authors
    Allahvirdizadeh, Amir
    El-Mowafy, Ahmed
    Date
    2022
    Type
    Conference Paper
    
    Metadata
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    Citation
    Allahvirdizadeh, A. and El-Mowafy, A. 2022. CubeSat's attitude determination using GNSS antenna array. In: International Global Navigation Satellite Systems Conference (IGNSS) 2022, 7th Dec 2022, Sydney.
    Source Conference
    International Global Navigation Satellite Systems Conference (IGNSS) 2022
    Additional URLs
    http://https//www.ignss.org.au/program
    Faculty
    Faculty of Science and Engineering
    School
    School of Earth and Planetary Sciences (EPS)
    URI
    http://hdl.handle.net/20.500.11937/89736
    Collection
    • Curtin Research Publications
    Abstract

    The attitude information of a CubeSat is essential to keeping the satellite in its favourable orientations in the mission and sensor positioning using precise orbit determination. The attitude of CubeSats can be determined using sun sensors, magnetometers, and star trackers. However, these sensors have some issues, including unavailability in shadow for sun sensors, low accuracy for magnetometers, and additional costs for star trackers. In this study, we propose an alternative method for the CubeSats attitude determination using the GNSS observations of an antenna array. Fixing the estimated double-differenced ambiguities as integer values equips the model with precise phase observations. In addition, the known geometry of the antenna array in the CubeSats reference frame helps us apply the rotation matrix's orthonormality constraints between the estimated baselines and the known ones. To validate the model, the actual observations of a 3U CubeSat from the Spire constellation are used to determine its precise orbit. An array of 3 coplanar antennae is then simulated using the definition of CubeSat's reference frame, the available quaternions from the star tracker and the precise orbits of CubeSats and GNSS satellites. The results validate the proposed method by providing acceptable Yaw, Pitch and Roll angles. The proposed model has the advantage of applying to the single-frequency receiver onboard the 1U low-cost and low-power CubeSats.

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