Keidai IIYAMAPHD CANDiDATE · STANFORD AERONAUTiCS AND ASTRONAUTiCS
 kiiyama{at}stanford.edu | https://kdricemt.github.io/ | https://www.linkedin.com/in/keidai-iiyama/Education
Stanford University
PHD CANDiDATE ‑ AERONAUTiCS AND ASTRONAUTiCS• GPA: 4.13/4.30• Research Area: Positioning, Navigation, and Timing of Lunar Satellites (Advisor: Grace Gao)

Stanford, CA
2021.9 ‑ present

The University of Tokyo
Tokyo, JapanME ‑ AERONAUTiCS AND ASTRONAUTiCS
2019.4 ‑ 2021.3• GPA: 4.00/4.00• Thesis: System Design and Autonomous Orbit Determination Strategy for Lunar Navigation Satellite System (Advisor: Ryu Funase)
The University of Tokyo
Tokyo, Japan
BE ‑ AERONAUTiCS AND ASTRONAUTiCS
2015.4 ‑ 2019.3• GPA: 3.53/4.00• Thesis: Navigation Satellite Constellation and Monitoring Station Arrangement for Lunar Global Navigation Satellite System (Advisor:Ryu Funase)Awards, Fellowships, & Grants
AWARDS
2024.9ION GNSS+ 2024 Best Presentation of the Session (as first‑author), for the paper (C17)2023.9ION GNSS+ 2023 Best Presentation of the Session (as co‑author), for the paper (C12)

FELLOWSHiPS & GRANTS
2022.1Student Registration Grant, 2022 ION ITM Conference

2021.9 ‑ 2022.8

Ph.D. Student Fellowship, Stanford Aero/Astro Department

2021.9 ‑ 2025.8Nakajima Foundation Study Abroad Fellowship, Nakajima Foundation

2019.9 ‑ 2021.8

WINGS CFS Fellowship, WINGS CFS, The University of Tokyo

Research Experience
Navigation and Autonomous Vehicles (NAV) Lab, Stanford University
Stanford, CA
ADViSOR: PROF. GRACE GAO
Sep, 2021 ‑ Present• Developed Diffusion Kalman Filter framework for time transfer from terrestrial GPS to lunar surface communication networks (C9)
• Developed a positioning and timing algorithm of lunar rovers and satellites using terrestrial GPS time‑differenced carrier phase (TDCP)
measurements (J2), (C10), (C11), (C13)• Developed an open‑source simulator for lunar positioning, navigation, and timing (C14)(C19)• Developed ephemeris optimization framework for lunar navigation satellites (C12)(J3)• Developed Distributed orbit determination and timing framework for satellite networks using covariance intersection (C16)• Developed an autonomous fault detection algorithm for satellite constellation using inter‑satellite links and rigid graphs (C17)Section 332H, Jet Propulsion Laboratory
Pasadena, CAADViSOR: DR. KAR‑MiNG CHEUNG, DR. WiLLiAM W.JUNJul, 2024 ‑ Sep, 2024
• Constellation design for future communication + PNT constellation around Mars
• Developed an orbit determination and time synchronization frameworks that combines inter‑satellite link and surface station link
• Related Publications: (C18)Space Rendezvous Lab, Stanford University
ADViSOR: PROF. SiMONE D’AMiCO• Developed an angles‑only navigation framework for spacecraft swarms in lunar orbits• Related Publications: (C8)SEPTEMBER 2024

KEiDAi IiYAMA · CURRiCULUM ViTAE

Stanford, CASep, 2021 ‑ May, 2022

1

Space Systems Optimization Group, Georgia Institute of Technology
Atlanta, GA
ADViSOR: PROF.KOKi HOJan, 2021 ‑ Feb, 2021
• Developed an autoencoder + deep reinforcement learning + feedback controller framework that autonomously selects safe landing
target site and plans divert maneuver from Lidar DEM observations during powered descent to planetary bodies.
• Related Publications: (C5), (C6)Intelligent Space Systems Laboratory, The University of Tokyo
Bunkyo‑Ku, Tokyo, JapanADViSOR: PROF. RYU FUNASEApr, 2018 ‑ Aug, 2021
• Developed decentralized autonomous orbit determination and clock offset estimation algorithm for LNSS navigation satellites con‑nected by crosslinks using a Schmidt Kalman Filter.
• Implemented a user positioning simulator for LNSS. Conducted positioning performance analysis for several constellations and lunar
monitoring station arrangement patterns.
• Related Publications: (C3), (C7)EQUULEUS Project TeamADViSOR: PROF.RYU FUNASE
Oct, 2017 ‑ Aug, 2021
• EQUULEUS is a 6U cubesat lunar mission jointly proposed by JAXA and the University of Tokyo to NASA. It is selected as the secondary
payload of the EM‑1 Mission (First flight of NASA’s Space Launch System (SLS))• Designed and Implemented flight software for heater control and FDIR of the thermal sub‑system.
• Contributed on environment tests and result analysis with MATLAB and Thermal Desktop.
• Related Publications: (J1), (C1), (C2), (C4)

Publications
JOURNAL PAPERS
2024(J3) Cortinovis,M., Iiyama,K., and Gao,G., ”Satellite Ephemeris Parameterization Methods to Support Lunar
Positioning, Navigation, and Timing Services”, Navigation: Journal of the Institute of Navigation, Vol. 71, Issue
4, 2024, https://doi.org/10.33012/navi.664(J2) Iiyama, K., Bhamidipati,S., and Gao,G., ”Precise Positioning and Timekeeping in Lunar Orbit via Terrestrial
GPS Time‑Differenced Carrier‑Phase Measurements”, Navigation: Journal of the Institute of Navigation, Vol. 71,
Issue 1, 2024, https://doi.org/10.33012/navi.635

2020(J1) Funase, R., Ikari, S., Miyoshi, K., et al., (as 20th author) “Mission to Earth‑Moon Lagrange Point by a 6U
CubeSat: EQUULEUS”, IEEE Aerospace & Electro. Systems Magazine, Vol.35, No.3, pp.30‑44, 2020,
https://doi.org/10.1109/MAES.2019.2955577

CONFERENCE PROCEEDiNGS *: Equal Contribution
2025(C19) Vila, G.C., Iiyama, K., and Gao,G., ”LuPNT: An Open‑Source Simulator for Lunar Communications,Positioning, Navigation, and Timing”, 2025 IEEE Aerospace Conference (AERO), Big Sky, MT, March 2025
(Abstract Accepted)(C18) Iiyama, K., Jun, W.W., Bhamidipati, S., Gao,G., Cheung,K.‑M., ”Orbit Determination and Time
Synchronization for the Future Mars Relay and Navigation Constellation”, 2025 IEEE Aerospace Conference(AERO), Big Sky, MT, March 2025 (Abstract Accepted)

2024(C17) Iiyama, K., and Gao,G., ”Autonomous Constellation Fault Monitoring with Inter‑satellite Links: A
Rigidity‑Based Approach”, Proceedings of the Institute of Navigation GNSS+ conference (ION GNSS+ 2024),Baltimore, MD, September 2024, Best Presentation of the Session(C16) *Iiyama, K., *Vila, G.C., and Gao,G., ”Contact Plan Optimization and Distributed State Estimation for Delay
Tolerant Satellite Networks”, 2024 IEEE Aerospace Conference (AERO), Big Sky, MT, March 2024

2023

SEPTEMBER 2024

(C15) *Shimane, Y., and *Iiyama, K., ”Methods for Dual‑Objective High Energy Tour Design”, 2023 AAS/AIAA
Astrodynamics Specialist Conference, Big Sky, MT, 2023

KEiDAi IiYAMA · CURRiCULUM ViTAE2(C14) *Iiyama, K., *Vila, G.C., and Gao,G., ”LuPNT: Open‑Source Simulator for Lunar Positioning, Navigation,and Timing”, Proceedings of the Institute of Navigation GNSS+ conference (ION GNSS+ 2023), Denver, CO,
September 2023
(C13) Iiyama, K., and Gao,G., ”Positioning and Timing of Distributed Lunar Satellites via Terrestrial GPS
Differential Carrier Phase Measurements”, Proceedings of the Institute of Navigation GNSS+ conference (IONGNSS+ 2023), Denver, CO, September, 2023
(C12) Cortinovis,M., Iiyama,K., and Gao,G., ”Satellite Ephemeris Approximation Methods to Support Lunar
Positioning, Navigation, and Timing Services”, Proceedings of the Institute of Navigation GNSS+ conference(ION GNSS+ 2023), Denver, CO, September, 2023, Best Presentation of the Session(C11) Iiyama, K., Bhamidipati,S., and Gao,G., “Terrestrial GPS Time‑Differenced Carrier‑Phase Positioning ofLunar Surface Users”, 2023 IEEE Aerospace Conference (AERO), Big Sky, MT, March, 2023
(C10) Iiyama, K., Bhamidipati,S., and Gao,G., “Precise Positioning and Timekeeping in Lunar Orbit via
Terrestrial GPS Time‑Differenced Carrier‑Phase Measurements”, Proceedings of the 2023 International
Technical Meeting of The Institute of Navigation, Long Beach, CA, January, 2023
2022

(C9) Bhamidipati,S., *Iiyama, K., *Mina,T ., and Gao,G., “Time‑Transfer from Terrestrial GPS for Distributed
Lunar Surface Communication Networks”, 2022 IEEE Aerospace Conference (AERO), Big Sky, MT, March, 2022.
(C8) Iiyama, K, Kruger, J., and D’Amico, S.,“Autonomous Distributed Angles‑Only Navigation and Timekeeping
in Lunar Orbit”, Proceedings of the 2023 International Technical Meeting of The Institute of Navigation, Long
Beach, CA, January, 2022, Student Registration Grant

2021(C7) Iiyama, K, and Funase, R., “Autonomous and Decentralized Orbit Determination and Clock Offset
Estimation of Lunar Navigation Satellites Using GPS Signals and Inter‑satellite Ranging”, Proceedings of theInstitute of Navigation GNSS+ conference (ION GNSS+ 2021), St.Louis, MO, USA, September, 2021)

2020(C6) Tomita, K., Skinner, K., Iiyama, K., Jagatia, B.A., Nakagawa, T., and Ho, K., “Real‑Time Terrain Mapping andProcessing for Safe Landing via Deep Neural Networks”, ASCEND, Las Vegas, NV, 2020
(C5) Iiyama,K, Tomita,K., Jagatia,B.A., Nakagawa,T., and Ho,K., “Deep Reinforcement Learning for Safe Landing
Site Selection with Concurrent Consideration of Divert Maneuver”, 2020 AAS/AIAA Astrodynamics Specialist
Conference, Online, August, 2020
(C4) Shibukawa, T., Matsushita, S., Iiyama, K., Ishikawa, A., Nishii, K., and Funase, R. “Flight Model Thermal
Design and Validation for a 6U Deep Space Cubesat EQUULEUS”, 50th International Conference on
Environmental Systems, Lisbon, Portugal, July, 2020. (conference postponed)2019(C3) Iiyama,K., “Optimization of the Navigation Satellite Constellation and Lunar Monitoring Station for Lunar
Global Navigation Satellite System”, 32nd International Symposium on Space Technology and Science, Fukui,Japan, j‑20s, June, 2019
(C2) Matsushita, S., Shibukawa, T., Iiyama, K., and Funase, R., “Thermal Design and Validation for a 6U Cubesat
EQUULEUS under Constraints Tightly Coupled with Orbital Design and Water Propulsion System”, 49th
International Conference on Environmental Systems, Bostion, MA, The United States, July, 2019.
(C1) Shibukawa, T., Matsushita, S., Iiyama, K., and Funase, R., “Reflection and Verification of Thermal Design
under Tightly‑Coupled Constraints to the 6U Deep Space CubeSat EQUULEUS”, 32nd International Symposiumon Space Technology and Science, Fukui, Japan, June, 2019.

Teaching Experience
Fall 2024
Fall 2019

SEPTEMBER 2024

AA272: Global Positioning Systems, taught by Prof. Grace Gao, Graduate Teaching Assistant,Stanford University
Astrodynamics (Undergraduate course), taught by Prof.Ryu Funase, Graduate Teaching
Assistant, The University of Tokyo
KEiDAi IiYAMA · CURRiCULUM ViTAE

3

Mentoring
2024.9‑Current
2023.1‑Current
2023.1‑2024.9
2022.9‑2023.3

Kaila Coimbra, Ph.D. Student, Stanford University
Guillem Casadesus Vila, Ph.D. Student, Stanford University
Marta Cortinovis, Ph.D. Student, Stanford University
Guillem Rueda Oller, Ph.D. Student, Stanford University

Miscellaneous
LANGUAGE
English (Fluent), Japanese (Native)

SOFTWARE SKiLLS
Programming Language: C, C++, Python, MATLAB

Version Control: Git, Subversion

Astrodynamics: GMAT, SPICE Toolbox, jTOP (spacecraft trajectory design software)
Optimization: CVXPY, SNOPT

Web: React, Jekyll

Engineering: Thermal Desktop, Autodesk

Machine Learning: Pytorch, Open AI Gym

PROFESSiONAL MEMBERSHiPSAIAA, IONSEPTEMBER 2024

KEiDAi IiYAMA · CURRiCULUM ViTAE4