Journal of Astronomy and Space Sciences

The Korean Space Science Society (한국우주과학회)
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Korea Pathfinder Lunar Orbiter Flight Dynamics Simulation and Rehearsal Results for Its Operational Readiness Checkout

  • Song, Young-Joo (Lunar Exploration Program Office, Korea Aerospace Research Institute) ;
  • Bae, Jonghee (Lunar Exploration Program Office, Korea Aerospace Research Institute) ;
  • Hong, SeungBum (Lunar Exploration Program Office, Korea Aerospace Research Institute) ;
  • Bang, Jun (Lunar Exploration Program Office, Korea Aerospace Research Institute)
  • Received : 2022.11.10
  • Accepted : 2022.12.07
  • Published : 2022.12.15
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Abstract

Korea Pathfinder Lunar Orbiter (KPLO), also known as Danuri, was successfully launched on 4 Aug. from Cape Canaveral Space Force Station using a Space-X Falcon-9 rocket. Flight dynamics (FD) operational readiness was one of the critical parts to be checked before the flight. To demonstrate FD software's readiness and enhance the operator's contingency response capabilities, KPLO FD specialists planned, organized, and conducted four simulations and two rehearsals before the KPLO launch. For the efficiency and integrity of FD simulation and rehearsal, different sets of blind test data were prepared, including the simulated tracking measurements that incorporated dynamical model errors, maneuver execution errors, and other errors associated with a tracking system. This paper presents the simulation and rehearsal results with lessons learned for the KPLO FD operational readiness checkout. As a result, every functionality of FD operation systems is firmly secured based on the operation procedure with an enhancement of contingency operational response capability. After conducting several simulations and rehearsals, KPLO FD specialists were much more confident in the flight teams' ability to overcome the challenges in a realistic flight and FD software's reliability in flying the KPLO. Moreover, the results of this work will provide numerous insights to the FD experts willing to prepare deep space flight operations.

Keywords

Acknowledgement

This work was supported by the Korea Aerospace Research Institute (KARI) through project No. FR22L00. Young-Joo Song took the lead in planning and conducting each simulation and rehearsal and writing the manuscript. Jonghee Bae took the lead in handling most of blind test data during the simulations and rehearsals. The authors would like to give special thanks to the Space Exploration Engineering (SEE) team, especially Craig Nickel, Lisa Policastri, Tiffany Finley, Stephen West, John Carrico, and Mike Loucks for their efforts and support in generating blind test data sets as well as intensive discussions during the simulations and rehearsals. Finally, this paper is dedicated to a dear friend and colleague, the late Dr. Young-Rok Kim, who devoted himself to the Danuri flight dynamics and with no doubt, who will join us the Danuri flight operation in the heavens.

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