All Stories

  1. Frequency Standard Contributions to Limitations on the Signal‐to‐Noise Ratio in Very Long Baseline Interferometric Observations

    Article • Radio Science, June 2026, American Geophysical Union (AGU)

    Dr Todd Ely

  2. Bayesian Benchmarking of GBEES Applied to Outer Planet Orbiter Estimation

    Article • Journal of Guidance Control and Dynamics, September 2025, American Institute of Aeronautics and Astronautics (AIAA)

    Dr Todd Ely, Benjamin Hanson

  3. The Benefit of Space Clocks for the Deep Space Network

    Article • Radio Science, August 2025, American Geophysical Union (AGU)

    Dr Todd Ely

  4. Spacecraft Position Determination with the Electra UHF Transceiver: A Comparison of One-Way and Two-Way Doppler Observations

    Article • March 2024, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Todd Ely

  5. Convergence of Technologies Enabling Radio Crosslink Missions for Planetary Atmospheric Structures

    Article • March 2024, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Todd Ely

  6. Formulation and Characterization of One-Way Radiometric Tracking with the Iris Radio Using a Chip-Scale Atomic Clock

    Article • NAVIGATION Journal of the Institute of Navigation, January 2024, Institute of Navigation

    Dr Todd Ely

  7. Application of shaken lattice interferometry based sensors to space navigation

    Article • Advances in Space Research, May 2023, Elsevier

    Dr Todd Ely

  8. Testing the gravitational redshift with an inner Solar System probe: The VERITAS case

    Article • March 2023, American Physical Society (APS)

    Dr Todd Ely

  9. Anomaly Detection in Autonomous Deep-Space Navigation via Filter Bank Gating Networks

    Article • Applied Sciences, November 2022, MDPI AG

    Dr Todd Ely

  10. Correction: Radiometric Autonomous Navigation Fused with Optical for Deep Space Exploration

    Article • The Journal of the Astronautical Sciences, August 2022, Springer Science + Business Media

    Dr Todd Ely

  11. Results of the Deep Space Atomic Clock Deep Space Navigation Analog Experiment

    Article • Journal of Spacecraft and Rockets, July 2022, American Institute of Aeronautics and Astronautics (AIAA)

    Dr Todd Ely

  12. Comparison of Deep Space Navigation Using Optical Imaging, Pulsar Time-of-Arrival Tracking, and/or Radiometric Tracking

    Article • The Journal of the Astronautical Sciences, April 2022, Springer Science + Business Media

    Dr Todd Ely

  13. Deep Space Atomic Clock Technology Demonstration Mission Results

    Article • March 2022, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Todd Ely

  14. VERITAS (Venus Emissivity, Radio Science, InSAR, Topography, and Spectroscopy): A Discovery Mission

    Article • March 2022, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Todd Ely

  15. Cislunar Navigation Technology Demonstrations on the CAPSTONE Mission

    Article • February 2022, Institute of Navigation

    Dr Todd Ely

  16. Demonstration of a trapped-ion atomic clock in space

    Article • Nature, June 2021, Springer Science + Business Media

    Dr Todd Ely

  17. Solar System Interiors, Atmospheres, and Surfaces Investigations via Radio Links: Goals for the Next Decade

    Article • March 2021, American Astronomical Society

    Dr Todd Ely

  18. Radiometric Autonomous Navigation Fused with Optical for Deep Space Exploration

    Article • The Journal of the Astronautical Sciences, January 2021, Springer Science + Business Media

    Dr Todd Ely

  19. Chip Scale Atomic Clock–Driven One-Way Radiometric Tracking for Low-Earth-Orbit CubeSat Navigation

    Article • Journal of Spacecraft and Rockets, January 2021, American Institute of Aeronautics and Astronautics (AIAA)

    Dr Todd Ely

  20. The Deep Space Atomic Clock: the first demonstration of a trapped ion atomic clock in space

    Article • December 2020, Research Square

    Dr Todd Ely

  21. Estimation of Thermal and Stochastic Variations of Chip Scale Atomic Clocks for Navigation of a Lunar CubeSat

    Article • February 2020, Institute of Navigation

    Dr Todd Ely

  22. Accurate Ground-based Near-Earth-Asteroid Astrometry Using Synthetic Tracking

    Article • The Astronomical Journal, July 2018, American Astronomical Society

    Dr Todd Ely

  23. Using the Deep Space Atomic Clock for Navigation and Science

    Article • IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, June 2018, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Todd Ely

  24. Solar System Ephemerides, Pulsar Timing, Gravitational Waves, & Navigation

    Article • Proceedings of the International Astronomical Union, September 2017, Cambridge University Press

    Dr Todd Ely

  25. The Deep-space Positioning System Concept: Automating Complex Navigation Operations Beyond the Earth

    Article • September 2016, American Institute of Aeronautics and Astronautics (AIAA)

    Dr Todd Ely

  26. Nanoradian ground-based astrometry, optical navigation, and artificial reference stars

    Article • August 2016, SPIE

    Dr Todd Ely

  27. Mercury Ion Clock for a NASA Technology Demonstration Mission

    Article • IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control, July 2016, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Todd Ely

  28. Transforming Mean and Osculating Elements Using Numerical Methods

    Article • The Journal of the Astronautical Sciences, March 2015, Springer Science + Business Media

    Dr Todd Ely

  29. Mean Element Propagations Using Numerical Averaging

    Article • The Journal of the Astronautical Sciences, September 2014, Springer Science + Business Media

    Dr Todd Ely

  30. Advancing Navigation, Timing, and Science with the Deep Space Atomic Clock

    Article • May 2014, American Institute of Aeronautics and Astronautics (AIAA)

    Dr Todd Ely

  31. Altair Navigation During Translunar Cruise, Lunar Orbit, Descent, and Landing

    Article • Journal of Spacecraft and Rockets, March 2012, American Institute of Aeronautics and Astronautics (AIAA)

    Dr Todd Ely

  32. Altair Navigation during Trans-lunar Cruise, Lunar Orbit, Descent and Landing

    Article • June 2010, American Institute of Aeronautics and Astronautics (AIAA)

    Dr Todd Ely

  33. Optical Navigation Plan and Strategy for the Lunar Lander Altair; OpNav for Lunar and other Crewed and Robotic Exploration Applications

    Article • June 2010, American Institute of Aeronautics and Astronautics (AIAA)

    Dr Todd Ely

  34. Preliminary Design of the Guidance, Navigation, and Control System of The Altair Lunar Lander

    Article • June 2010, American Institute of Aeronautics and Astronautics (AIAA)

    Dr Todd Ely

  35. Real-Time Navigation for Mars Missions Using the Mars Network

    Article • Journal of Spacecraft and Rockets, May 2008, American Institute of Aeronautics and Astronautics (AIAA)

    Dr Todd Ely

  36. Real-Time EDL Navigation Performance Using Spacecraft to Spacecraft Radiometric Data

    Article • June 2006, American Institute of Aeronautics and Astronautics (AIAA)

    Dr Todd Ely

  37. Constellations of elliptical inclined lunar orbits providing polar and global coverage

    Article • The Journal of the Astronautical Sciences, March 2006, Springer Science + Business Media

    Dr Todd Ely

  38. Initial Results of Rover Localization and Topographic Mapping for the 2003 Mars Exploration Rover Mission

    Article • Photogrammetric Engineering & Remote Sensing, October 2005, American Society for Photogrammetry and Remote Sensing

    Dr Todd Ely

  39. Stable Constellations of Frozen Elliptical Inclined Lunar Orbits

    Article • The Journal of the Astronautical Sciences, September 2005, Springer Science + Business Media

    Dr Todd Ely

  40. Expected EDL Navigation Performance with Spacecraft to Spacecraft Radiometric Data

    Article • June 2005, American Institute of Aeronautics and Astronautics (AIAA)

    Dr Todd Ely

  41. Integrated network architecture for sustained human and robotic exploration

    Article • January 2005, Institute of Electrical & Electronics Engineers (IEEE)

    Dr Todd Ely

  42. Mars network for enabling low-cost missions

    Article • Acta Astronautica, January 2003, Elsevier

    Dr Todd Ely

  43. Mars Approach Navigation Using Mars Network Based Doppler Tracking

    Article • June 2002, American Institute of Aeronautics and Astronautics (AIAA)

    Dr Todd Ely

  44. Eccentricity Impact on East-West Stationkeeping for Global Positioning System Class Orbits

    Article • Journal of Guidance Control and Dynamics, March 2002, American Institute of Aeronautics and Astronautics (AIAA)

    Dr Todd Ely

  45. Event Detection and Characterization During Autonomous Interplanetary Navigation

    Article • Journal of Guidance Control and Dynamics, March 2002, American Institute of Aeronautics and Astronautics (AIAA)

    Dr Todd Ely

  46. Strategies for telecommunications and navigation in support of Mars exploration

    Article • Acta Astronautica, March 2001, Elsevier

    Dr Todd Ely

  47. East–west stationkeeping of satellite orbits with resonant tesseral harmonics

    Article • Acta Astronautica, January 2000, Elsevier

    Dr Todd Ely

  48. Dynamics of artificial satellite orbits with tesseral resonances including the effects of luni- solar perturbations

    Article • Dynamics and Stability of Systems, January 1997, Taylor & Francis

    Dr Todd Ely

  49. Carrier acquisition and tracking requirements for doppler navigation

    Article • Institute of Electrical & Electronics Engineers (IEEE)

    Dr Todd Ely