• Title/Summary/Keyword: 달 탐사

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Assessment of DTVC Operation Efficiency for the Simulation of High Vacuum and Cryogenic Lunar Surface Environment (고진공 및 극저온 달의 지상 환경 재현을 위한 지반열진공챔버 운영 효율성 평가)

  • Jin, Hyunwoo;Chung, Taeil;Lee, Jangguen;Shin, Hyu-Soung;Ryu, Byung Hyun
    • Journal of the Korean Geotechnical Society
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    • v.38 no.12
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    • pp.125-134
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    • 2022
  • The Global Expansion Roadmap published by the International Space Exploration Coordination Group, which is organized by space agencies around the world, presents future lunar exploration guidance and stresses a lunar habitat program to utilize lunar resources. The Moon attracts attention as an outpost for deep space exploration. Simulating lunar surface environments is required to evaluate the performances of various equipment for future lunar surface missions. In this paper, an experimental study was conducted to simulate high vacuum pressure and cryogenic temperature of the permanent shadow regions in the lunar south pole, which is a promising candidate for landing and outpost construction. The establishment of an efficient dirty thermal vacuum chamber (DTVC) operation process has never been presented. One-dimensional ground cooling tests were conducted with various vacuum pressures with the Korean Lunar Simulant type-1 (KLS-1) in DTVC. The most advantageous vacuum pressure was found to be 30-80 mbar, considering the cooling efficiency and equipment stability. However, peripheral cooling is also required to simulate a cryogenic for not sublimating ice in a high vacuum pressure. In this study, an efficient peripheral cooling operation process was proposed by applying the frost ratio concept.

Mission Design for a Lunar Orbiter Launched by KSLV-II (한국형발사체를 사용한 달궤도선의 임무 설계)

  • Song, Eun-Jung;Park, Chang-Su;Cho, Sang-Bum;Roh, Woong-Rae
    • Aerospace Engineering and Technology
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    • v.8 no.1
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    • pp.108-116
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    • 2009
  • This paper considers the trajectory design problem for a lunar orbiter when launched by KSLV-II. KSLV-II puts its kick motor stage and lunar orbiter into a low earth orbit, and then the kick motor stage performed the translunar injection. To simulate more realistic situations, TLI (Trans-Lunar Injection) and LOI (Lunar Orbit Injection) maneuvers are modeled as finite burns. The feasibility of the lunar mission by KSLV-II are confirmed by the numerical results that show the reasonable required-velocity and propellant usage.

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Analysis on Wireless Communications Environment at Lunar Surface for Lunar Exploration (달 탐사를 위한 달 표면에서의 무선통신 환경 분석)

  • Lee, Yong-Min;Lee, Byong-Sun;Ahn, Jae-Young
    • Journal of the Institute of Electronics and Information Engineers
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    • v.51 no.10
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    • pp.50-54
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    • 2014
  • Evaluation of the possible or probable effects of environmental conditions which are temperature, radiation, dust as well as other possibilities in terms of meteoroids, seismicity, and no global magnetic field has been carried out for wireless communications on the lunar surface in this paper. The results considered in this paper can be utilized as a basic information on making efficient use of the design for wireless communications system in Korean lunar exploration project.

Lunar Exploration Employing a Quadruped Robot on the Fault of the Rupes Recta for Investigating the Geological Formation History of the Mare Nubium (4족 보행 로봇을 활용한 달의 직선절벽(Rupes Recta)의 단층면 탐사를 통한 구름의 바다(Mare Nubium) 지역의 지질학적 형성 연구)

  • Hong, Ik-Seon;Yi, Yu;Ju, Gwanghyeok
    • Journal of Space Technology and Applications
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    • v.1 no.1
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    • pp.64-75
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    • 2021
  • On the moon as well as the earth, one of the easiest ways to understand geological formation history of any region is to observe the stratigraphy if it is available, the order in which the strata build up. By analyzing stratigraphy, it is possible to infer what geological events have occurred in the past. Mare Nubium also has an unique normal fault called Rupes Recta that shows stratigraphy. However, a rover moving with wheels is incompetent to explore the cliff since the Rupes Recta has an inclination of 10° - 30°. Therefore, a quadruped walking robot must be employed for stable expedition. To exploration a fault with a four-legged walking robot, it is necessary to design an expedition route by taking account of whether the stratigraphy is well displayed, whether the slope of the terrain is moderate, and whether there are obstacles and rough texture in the terrain based on the remote sensing data from the previous lunar missions. For the payloads required for fault surface exploration we propose an optical camera to grasp the actual appearance, a spectrometer to analyze the composition, and a drill to obtain samples that are not exposed outward.

Implementation of Deferred NAK Mode Simulator for Large-Volume Telemetry Data Transmission in Deep Space Communication Systems (심우주 통신 시스템에서 대용량 Telemetry 데이터 전송을 위한 Deferred NAK Mode 시뮬레이터 구현)

  • Hong, Hee-Jin;Lee, Ju-Byung;Yoon, Dong-Weon;Hyun, Kwang-Min
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.39 no.1
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    • pp.69-75
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    • 2011
  • As part of its space development program, Korea has a plan for the launch of a lunar orbiter and a lunar lander. To enable the transmission of lunar information based on multimedia, it is necessary to construct a communication system that is capable of transmitting large-volume telemetry data. The CCSDS standard recommends the deferred NAK mode as ARQ scheme for reliable long-distance deep-space communication systems. In this paper, we implement a space communication system simulator in the deferred NAK mode using models of the lunar orbiter, the earth station, and the space environment. The simulator employs modulation techniques and turbo coding schemes for transmitting large-volume telemetry data. We analyze the transmission performance of telemetry data through the simulation.

Satellite Trajectory Correction Maneuver for Lunar Mission based on Three-Body Dynamics (달탐사 임무를 위한 3체 운동방정식 기반의 인공위성 궤적보정 기동)

  • Cho, Dong-Hyun;Jung, Young-Suk;Lee, Dong-Hun;Jung, Bo-Young;Bang, Hyo-Choong
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.38 no.9
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    • pp.875-881
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    • 2010
  • During the lunar mission, spacecraft are subject to various unexpected disturbance sources such as third body attraction, solar pressure and operating impulsive maneuver error. Therefore, efficient trajectory correction maneuver (TCM) strategy must be required to follow the designed mission trajectory. In the early days of space exploration, the mission trajectory has been designed by using patched conic approach based on two-body dynamics for the lunar mission. Thus the TCM based on two-body dynamics has been usually adopted. However, with the advanced in computing power, the mission trajectory based on three-body dynamics is attempted recently. Thus, these approaches based on two-body dynamics are essentially different from real environment and large amount of energy for the TCM is required. In this work, we study the trajectory correction maneuver based on three-body dynamics.

Analysis Distribution and Feature of Lunar Gravity Field Using SGM90d Model (SGM90d모델을 이용한 달 중력장 분포 및 특징 분석)

  • Huang, He;Yun, Hong-Sic;Lee, Dong-Ha
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.27 no.2
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    • pp.129-138
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    • 2009
  • The lunar gravity field is an important source to understand the lunar interior structure, dichotomy and magma ocean of the moon, furthermore it can be used to study the origin and evolution history of the moon. In this paper, we firstly investigated the history of lunar exploration were performed for determining the lunar gravity field, in addition to investigating the procedure of progress related with the lunar gravity field model and gravity observations techniques. After, we determined practically the gravity anomalies of the moon using the new lunar gravity model, SGM90d (SELENE Gravity Model), which were developed by processing the tracking data from SELENE, the japanese lunar mission. Finally, we compared the lunar gravity anomalies from SGM90d model to the those from existing lunar gravity model (LP165P). As results from the comparison, we can make a sense that 4-way Doppler observations of SELENE is very effective to measure the gravity field on the farside of the moon. The precise lunar gravity field model including the farside of the moon which can be more helpful to understand the dichotomy of moon and to establish the detailed distribution of lunar gravity field, such as a mascon.