Andrew Kiyoung Sun

aksun_2026.jpg

I’m a Postdoctoral Researcher in the Satellite Navigation and Sensing (SeNSe) Laboratory at the University of Colorado Boulder, where I work with Prof. Jade Morton in the Ann and H.J. Smead Department of Aerospace Engineering Sciences. Before joining CU Boulder in 2026, I was a KAIST Jang Young Sil Postdoctoral Fellow at the KAIST GNSS Lab with Prof. Jiyun Lee, where I completed my Ph.D. in 2025.

My research interests:

  • Ionospheric irregularities: characterizing plasma irregularity structure from GNSS and LEO satellite signals
  • Scintillation modeling: simulating low- and high-latitude scintillation with physics-based phase screen models
  • GNSS receiver tracking: analyzing tracking performance under scintillation with software-defined radio (SDR) receivers
  • Navigation integrity: assessing scintillation effects on safety-critical aviation systems such as GBAS, SBAS, and ARAIM

My doctoral dissertation, GBAS Integrity under Ionospheric Scintillation: Error Characterization, Modeling, and Performance Evaluation, characterized and modeled scintillation-induced errors in GBAS and evaluated their effect on integrity. For this work, I received the 2026 RTCA William E. Jackson Award.

honors

Sep 2026 Kwon Sejin Fellowship, Department of Aerospace Engineering, KAIST
Sep 2026 Best Presentation Award, ION GNSS+ 2026
Session D5: Atmospheric Modeling and Mitigation with GNSS and LEO-PNT Systems
Jun 2026 William E. Jackson Award, Radio Technical Commission for Aeronautics (RTCA)
Sep 2025 Outstanding Doctoral Dissertation Award, KAIST Aerospace Engineering Alumni Association
Sep 2025 Best Presentation Award, ION GNSS+ 2025
Session F4: Atmospheric Effects on GNSS and LEO-PNT Systems
Sep 2025 Jang Young Sil Fellowship, KAIST Office of Research Affairs
Sep 2024 Best Presentation Award, ION GNSS+ 2024
Session B2: Trends in GNSS Augmentation Systems

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, 2026
    DOI
  2. ION GNSS+
    Validity of the parabolic approximation in ionospheric scintillation simulation
    A. K. Sun, B. Breitsch, Y. J. Morton, and C. Rino
    In Proc. ION GNSS+, Orlando, FL, Sep 2026
    Best Presentation Award DOI
  3. ION GNSS+
    Which GPS signal loses lock most often during scintillation, L1, L2C, or L5? A January 2026 storm case study
    A. K. Sun, B. Breitsch, Y. J. Morton, W. Younas, and K. B. Deshpande
    In Proc. ION GNSS+, Orlando, FL, Sep 2026
    DOI
  4. ION ITM
    Assessment of integrity monitor impacts on GBAS performance under ionospheric scintillation
    A. K. Sun, J. Lee, S. Pullen, and M. Caamano
    In Proc. ION ITM, Anaheim, CA, Jan 2026
    DOI
  5. 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, Jan 2025
    DOI
  6. JGR Space Physics
    Do solar eclipses generate propagating ionospheric perturbations?
    A. K. Sun, H. Kil, H. Chang, W. K. Lee, and J. Lee
    Journal of Geophysical Research: Space Physics, Jan 2025
    DOI
  7. 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
  8. 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
    Featured in an Eos Research Spotlight (Oct. 2021)
    DOI