Lessons Learned from Korea Pathfinder Lunar Orbiter Flight Dynamics
                    Operations: NASA Deep Space Network Interfaces and Support
                    Levels

Song, Young Woong; Hong, SeungBum; Kim, Dong-Gyu; Bang, Jun; Bae, Jonghee

doi:10.5140/jass.2023.40.2.79

Cited by 5 publications

(4 citation statements)

References 2 publications

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“…The DSN continued to support the KPLO mission during the lunar orbit acquisition phase from 16 December 2022 to 31 December 2022 (Song et al 2023c). All three LOI The commissioning phase was started earlier than original plan.…”

Section: Operation Results In Lunar Orbit Acquisition Phase (December...mentioning

confidence: 99%

Korea Pathfinder Lunar Orbiter (KPLO) Operation: From Design to Initial Results

Jeon,

Cho,

Kim

et al. 2024

J. Astron. Space Sci.

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Korea Pathfinder Lunar Orbiter (KPLO) is South Korea’s first space exploration mission, developed by the Korea Aerospace Research Institute. It aims to develop technologies for lunar exploration, explore lunar science, and test new technologies. KPLO was launched on August 5, 2022, by a Falcon-9 launch vehicle from cape canaveral space force station (CCSFS) in the United States and placed on a ballistic lunar transfer (BLT) trajectory. A total of four trajectory correction maneuvers were performed during the approximately 4.5-month trans-lunar cruise phase to reach the Moon. Starting with the first lunar orbit insertion (LOI) maneuver on December 16, the spacecraft performed a total of three maneuvers before arriving at the lunar mission orbit, at an altitude of 100 kilometers, on December 27, 2022. After entering lunar orbit, the commissioning phase validated the operation of the mission mode, in which the payload is oriented toward the center of the Moon. After completing about one month of commissioning, normal mission operations began, and each payload successfully performed its planned mission. All of the spacecraft operations that KPLO performs from launch to normal operations were designed through the system operations design process. This includes operations that are automatically initiated post-separation from the launch vehicle, as well as those in lunar transfer orbit and lunar mission orbit. Key operational procedures such as the spacecraft’s initial checkout, trajectory correction maneuvers, LOI, and commissioning were developed during the early operation preparation phase. These procedures were executed effectively during both the early and normal operation phases. The successful execution of these operations confirms the robust verification of the system operation.

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Section: Operation Results In Lunar Orbit Acquisition Phase (December...mentioning

confidence: 99%

Korea Pathfinder Lunar Orbiter (KPLO) Operation: From Design to Initial Results

Jeon,

Cho,

Kim

et al. 2024

J. Astron. Space Sci.

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“…The gradiometer technique has been applied to remove magnetic interference during many space missions [10,11]. Recently, Constantinescu et al [12] used the maximum variance analysis and gradiometer technique to reduce spacecraft-generated magnetic field disturbances from magnetic field measurements observed by the geosynchronous GK2A satellite [13]. In addition, to check the stability of the magnetically cleaned data from the GK2A satellite, the procedure of magnetic cleanliness by using the gradiometer technique is conducted once every week [12].…”

Section: Of 16mentioning

confidence: 99%

“…L,be f ore (13) Finally, the high-frequency noise is mitigated by multiplying the ratio by the corrected value in the maximum variance direction only, as in Equation ( 13).…”

Section: Mitigation Of Amplified High-frequency Noisementioning

confidence: 99%

Correction of Spacecraft Magnetic Field Noise: Initial KMAG Observation in the Solar Wind

Lee,

Jin,

Kim

et al. 2023

Preprint

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The Korean Pathfinder Lunar Orbiter (KPLO)-MAGnetometer (KMAG) consists of three triaxial fluxgate sensors (MAG1, MAG2, and MAG3) to measure the magnetic field around the Moon. The three sensors are mounted in the order of MAG3, MAG2, and MAG1 inside a 1.2 m long boom away from the satellite body. Before it arrived on the Moon, we compared the magnetic field measurements taken by DSCOVR and KPLO in the solar wind to verify the measurement performance of the KMAG instrument. We found that there were artificial disturbances in the KMAG measurement data, such as step-like and spike-like disturbances, which were produced by the spacecraft body. To remove spacecraft-generated disturbances, we applied a multi-sensor method, employing the gradiometer technique and principal component analysis and using KMAG magnetic field data and confirmed the successful elimination of spacecraft-generated disturbances. This indicates that the multi-sensor method is able to clean the magnetic field data measured onboard the KPLO.

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“…Furthermore, cooperation with other entities was also prepared. Interfaces with National Aeronautics and Space Administration (NASA)'s Deep Space Network were established to facilitate the gathering of tracking data, as well as spacecraft's telemetry and command (Song et al 2023d). Collaborative efforts between Korea Aerospace Research Institute (KARI) FD team and NASA Johnson Space Center Flight Operations Directorate were made to compare orbit determination (OD) and maneuver planning (MP) solutions.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Contingency Trajectory Operation for the Korea Pathfinder Lunar Orbiter

Bang,

Hong,

Bae

et al. 2023

J. Astron. Space Sci.

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The Korea Pathfinder Lunar Orbiter (KPLO), also known as Danuri, successfully entered its mission orbit on December 27, 2022 (UTC), and is currently performing its mission smoothly. To mitigate potential contingencies during the flight and to navigate the spacecraft into the desired lunar orbit, the KPLO flight dynamics (FD) team analyzed major trajectory-related contingencies that could lead to the violation of mission requirements and prepared operational procedures from the perspective of trajectory and FD. This paper presents the process of preparing contingency trajectory operations for the KPLO, including the identification of trajectory contingencies, prioritization results, and the development of recovery plans and operational procedures. The prepared plans were successfully applied to address minor contingencies encountered during actual operations. The results of this study will provide valuable insights to FD engineers preparing for space exploration mission operations.

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Lessons Learned from Korea Pathfinder Lunar Orbiter Flight Dynamics Operations: NASA Deep Space Network Interfaces and Support Levels

Cited by 5 publications

References 2 publications

Korea Pathfinder Lunar Orbiter (KPLO) Operation: From Design to Initial Results

Korea Pathfinder Lunar Orbiter (KPLO) Operation: From Design to Initial Results

Correction of Spacecraft Magnetic Field Noise: Initial KMAG Observation in the Solar Wind

Preparation of Contingency Trajectory Operation for the Korea Pathfinder Lunar Orbiter

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