• Title, Summary, Keyword: HAUSAT-2

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FLIGHT SOFTWARE DEVELOPMENT FOR HAUSAT-2 ON-BOARD COMPUTER (HAUSAT-2 비행소프트웨어 개발)

  • Shim Chang-Hwan;Ryu Jung-Hwan;Choi Young-Hoon;Chang Young-Keun
    • Bulletin of the Korean Space Science Society
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    • pp.117-120
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    • 2006
  • HAUSAT-2 flight software was developed by first analyzing the satellite requirements, and incorporating the results into the software. Coding and compiling is done after the software is completed, then individual and integrated tests are performed in order to verify the flight software algorithm. Currently, HAUSAT-2 flight software integrated test has been performed and the test result is serving as a basis for code modification nd additional developments. This paper describes the architecture, development process, and development environment of HAUSAT-2 flight software.

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THE ORBITAL THERMAL ANALYSIS OF HAUSAT-2 AND ITS THERMAL CONTROL SUBSYSTEM PRELIMINARY DESIGN (HAUSAT-2의 궤도 열해석과 열제어계의 예비설계)

  • Lee Mi-Hyeon;Kim Dong-Woon;Chang Young-Keun
    • Bulletin of the Korean Space Science Society
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    • pp.129-132
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    • 2005
  • This paper describes BAUSAT-2 orbital thermal analysis and preliminary design of thermal control subsystem. To design thermal control subsystem of HAUSAT-2, we have considered active & passive thermal control method based on basic theory and themal equilibrium equation. Using this result, suitable thermal control method and material have been selected. We have designed thermal control subsystem based on analysis of HAUSAT-2's thermal environments on sun synchronous orbit with altitude 650km, inclination $98^{\circ}$ and thermal distribution and range expectation of each HAUSAT-2's surface. Thermal analysis consists of system level, box level and board level analysis. We have completed system level and box level analysis. Till now, board level analysis of main heat dissipation board in progress. Thermal control subsystem has designed according to thermal analysis result. This design is to maintain all of the HAUSAT-2 components within the allowable temperature limits. In future, STM

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HAUSAT-2 STM(Structural-Thermal Model) Development and Launch Environment Test Result Analyses (HAUSAT-2 위성 STM 개발 및 발사환경시험 분석)

  • Chang, Jin-Soo;Hwang, Ki-Lyong;Chang, Young-Keun
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.33 no.11
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    • pp.95-105
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    • 2005
  • The HAUSAT-2 nanosatellite which is scheduled to launch in 2008 is being developed by SSRL(Space System Research Lab.). The HAUSAT-2 STM(Structural-Thermal Model) was developed as the first system model to verify structural and thermal design margin. The qualification level vibration and thermal tests have been conducted on STM. This paper addresses the comparison of structural analysis and test results of HAUSAT-2 STM. It was shown that the natural frequency of HAUSAT-2 STM satisfies the stiffness requirements without structural damage in the random vibration test. The assembly and integration validity were also checked out through STM.

DEVELOPMENT AND PERFORMANCE VERIFICATION OF NANOSATELLITE HAUSAT-2 COMMUNICATION SUBSYSTEM (나노위성 HAUSAT-2 통신 서브시스템 개발 및 성능검증)

  • Yi Shim-Ho;Moon Byoung-Young;Na Hee-Seung;Chang Young-Keun
    • Bulletin of the Korean Space Science Society
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    • pp.125-128
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    • 2006
  • Communication Subsystem of HAUSAT-2 which is 25kg class nanosatellite is designed, manufactured and tested for its performance verification at the Space System Research Laboratory (SSRL). HAUSAT-2 Communication Subsystem provides communication link for commands receiving, mission and state of health data transmission with high reliability. This paper describes design, manufacturing, test results of Engineering Model of HAUSAT-2.

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ANALYSIS OF THE HAUSAT-2 ATTITUDE CONTROL (HAUSAT-2 자세제어 성능 해석)

  • Lee Byung-Hoon;Kim Soo-Jung;Chang Young-Keun
    • Bulletin of the Korean Space Science Society
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    • pp.133-137
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    • 2005
  • This paper describes the design and performance verification of a pitch momentum bias control system being built by students at the Space System Research Laboratory(SSRL). HAUSAT-2 ADCS(Attitude Determination and Control of Subsystem) op-elation mode is divided into two parts, initial mode and on-orbit mode. This paper describes design of the HAUSAT-2 performance of attitude control results using pitch momentum bias control method in initial mode and on-orbit mode and momentum dumping method.

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HAUSAT-2 SATELLITE RADIATION ENVIRONMENT ANALYSIS AND SOFTWARE RAMMING CODE EDAC IMPLEMENTATION (HAUSAT-2 위성의 방사능 환경해석 및 소프트웨어 HAMMING CODE EDAC의 구현에 관한 연구)

  • Jung, Ji-Wan;Chang, Young-Keun
    • Journal of Astronomy and Space Sciences
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    • v.22 no.4
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    • pp.537-558
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    • 2005
  • This paper addresses the results of HAUSAT-2 radiation environment and effect analyses, including TID and SEE analyses. Trapped proton and electron, solar proton, galactic cosmic ray models were considered for HAUSAT-2 TID radiation environment analysis. TID was analyzed through total dose-depth curve and the radiation tolerance of TID for HAUSAT-2 components was verified by using DMBP method and sectoring analysis. HAUSAT-2 LET spectrum for heavy ion and proton were also analyzed for SEE investigation. SEE(SEU, SEL) analyses were accomplished for MPC860T2B microprocessor and K6X8008T2B memory. It was estimated that several SEUs may occur without SEL during the HAUSAT-2 mission life(2 years). Software Hamming Code EDAC has been implemented to detect and correct the SEU. In this study, all radiation analyses were conducted by using SPENVIS software.

HAUSAT-2 SPACE RADIATION ENVIRONMENT AND EFFECTS ANALYSIS (HAUSAT-2 우주방사능 환경과 영향 분석)

  • Jung Ji-wan;Chang Young-Keun
    • Bulletin of the Korean Space Science Society
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    • pp.143-147
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    • 2005
  • This paper describes the analysis of radiation environment and effects. TID(Total ionizing Dose) and SEE(Single Event Effects) analysis are implemented. The HAUSAT-2 is a 25kg class nanosatellite which is operated at sun-synchronous orbit at an altitude 650km. Trapped proton and Electron, Solar Proton, Galactic Cosmic Ray models are considered to HAUSAT-2 radiation environment model. Total Dose-depth curve provides TID degree and components are verified by DMBP method and Sectoring analysis. SEE are analysed with Radiation Test Report. Existing Radiation Test Reports are use to SEE analysis of HAUSAT-2.

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THERMAL ANALYSES AND VERIFICATION FOR HAUSAT-2 SMALL SATELLITE (HAUSAT-2 소형위성 열해석 검증 및 보드-레벨 열해석)

  • Lee Mi-Hyeon;Kim Dong-Woon;Chang Young-Keun
    • Journal of Astronomy and Space Sciences
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    • v.23 no.1
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    • pp.39-54
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    • 2006
  • HAUSAT-2 is nano satellite with 25kg mass being developed by Space System Research Lab. in Hnakuk Aviation University. This paper addresses HAUSAT-2 small satellite thermal analyses and its verification at satellite system, electronic box, and PCB levels. Thermal model which is used for system-level and box-level thermal analyses was verified and corrected through thermal vacuum/balance test. The new board-level thermal analysis methodology, modelling high-power dissipating EEE parts directly, was proposed. The proposed methodology has been verified with test results.

Space Simulation Test and Thermal Verification of HAUSAT-2 STM (Structural-Thermal Model) by Using Surface Heaters (표면히터를 이용한 HAUSAT-2 위성 STM의 우주모사 및 열해석 검증 연구)

  • Lee, Mi-Hyeon;Kim, Dong-Woon;Hwang, Ki-Lyong;Chang, Young-Keun
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.33 no.11
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    • pp.106-114
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    • 2005
  • This study addresses space simulation test results and thermal modelling verification of HAUSAT-2 nanosatellite STM (Structural-Thermal Model). The thermal modelling of the HAUSAT-2 has been modified in accordance with test results. Thermal analysis results were repeatedly compared with test results for modified thermal modelling. It is verified that the analysis results for modified thermal modelling agree well with test results. Some surface heaters were implemented to simulate solar illumination for HAUSAT-2 Thermal Vacuum/Balance Test. A low-cost and effective thermal test methodology, which is applicable to ultra-small satellite system, was proposed and verified by test results in this study.

A Study on HAUSAT-1 Satellite Fault-Tolerant System Architecture Design

  • Kim, Young-Hyun;Chang, Young-Keun
    • International Journal of Aeronautical and Space Sciences
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    • v.4 no.2
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    • pp.37-50
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    • 2003
  • A next generation small satellite HAUSAT-1, the first picosatellite developed in Korea, is being developed as one of the international CubeSat program by Space System Research Lab. of Hankuk Aviation University. A fault-tolerant incremental design methodology has been addressed in this paper. In this study, the effect of system redundancy on reliability was in details analyzed in accordance with the implementation of fault-tolerant system. Four different system recovery levels are proposed for HAUSAT-1 fault-tolerant system optimization. As a result, the HAUSAT-1 fault-tolerant system architecture design and reliability analysis has acquired about 11% reliability improvement.