Andrew Kiyoung Sun

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I’m a Postdoctoral Researcher and KAIST Jang Young Sil Fellow at KAIST GNSS Lab supervised by Prof. Jiyun Lee. I completed my Ph.D. in August 2025.

My research interests:

  • Ionospheric dynamics: studying plasma structures and their physical processes
  • Scintillation modeling: developing physics-based simulation models
  • Navigation Integrity: assessing scintillation effects on safety-critical applications such as Ground Based Augmentation System (GBAS)

My doctoral dissertation, GBAS Integrity under Ionospheric Scintillation: Error Characterization, Modeling, and Performance Evaluation, develops comprehensive integrity frameworks addressing critical safety requirements for aviation navigation systems under ionospheric scintillation.

I was a visiting researcher at German Aerospace Center (DLR) in 2016, NASA Jet Propulsion Laboratory (JPL) (2020-2021), and SeNSe Lab at the University of Colorado Boulder supervised by Prof. Jade Morton in 2023.

selected publications

  1. NAVIGATION
    Ionospheric scintillation effects on LEO-transmitted signals across multiple frequency bands
    A. K. Sun, Y. J. Morton, C. Rino, and J. Lee
    NAVIGATION, 2025
    Accepted
  2. IEEE TAES
    Analysis of diffraction-induced residual errors in GNSS augmentation systems under ionospheric scintillation
    A. K. Sun, S. Pullen, and J. Lee
    IEEE Transactions on Aerospace and Electronic Systems, 2025
    early access
    DOI
  3. JGR Space Physics
    Do solar eclipse generate propagating ionospheric perturbations?
    A. K. Sun, H. Chang H. Kil, W. K. Lee, and J. Lee
    Journal of Geophysical Research: Space Physics, 2025
    DOI
  4. ION ITM
    Ionospheric scintillation effects across multiple carrier frequency bands transmitted from LEO satellites
    A. K. Sun, Y. J. Morton, and J. Lee
    In Proc. ION ITM, Long Beach, CA, Jan 2024
    DOI
  5. Radio Science
    Statistical uncertainty in the frequency dependence of the intensity scintillation index (S4)
    A. K. Sun, X. Pi, C. Rino, and J. Lee
    Radio Science, Jan 2023
    DOI
  6. ION ITM
    Availability assessment of dual-frequency GNSS-based augmentation systems under equatorial ionospheric scintillations
    A. K. Sun, J. Chang, J. Lee, B. Breitsch, and Y. J. Morton
    In Proc. ION ITM, Long Beach, CA, Jan 2023
    DOI
  7. Space Weather
    Markov chain-based stochastic modeling of deep signal fading: Availability assessment of dual-frequency GNSS-based aviation under ionospheric scintillation
    A. K. Sun, H. Chang, S. Pullen, H. Kil, J. Seo, and 2 more authors
    Space Weather, Jan 2021
    DOI
  8. ION ITM
    Performance benefit from dual-frequency GNSS-based aviation applications under ionospheric scintillation: A new approach to fading process modeling
    A. K. Sun, H. Chang, J. Lee, J. Seo, Y. J. Morton, and 1 more author
    In Proc. ION ITM, San Diego, CA, Jan 2020
    DOI