• The Bulletin of The Korean Astronomical Society
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• v.28 no.2
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• pp.23-23
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• 2003

• The Bulletin of The Korean Astronomical Society
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• v.37 no.2
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• pp.124.2-124.2
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• 2012

위성체의 전위는 위성 주변의 우주 환경에 크게 영향을 받는다. 본 연구에서는 과학기술위성 1호(STSAT-1)에 탑재된 LP(Langmuir Probe)와 ESA(Electro-Static Analyzer) 관측 자료를 이용하여 위성체의 전위에 위성 주변 고에너지 입자들이 미치는 영향을 분석하였다. 일반적으로 위성체가 대전되어 위성체의 부동전위가 감소할 때 위성 주변의 플라즈마 밀도는 감소하고 온도는 증가한다. 또한 DMSP 위성 등을 비롯한 이전 관측에서는 고에너지 입자의 플럭스가 증가하는 지역을 위성이 통과할 때 위성체의 전위가 감소하였다. 본 연구에서는 위성이 수 ~ 수 십 keV 정도의 고에너지 입자 플럭스가 증가한 후 감소하는 지역을 통과할 때에도 위성체의 전위가 감소하는 현상을 관측하였다. 고에너지 입자의 플럭스가 감소하는 지역에서 일어나는 위성의 대전현상을 통계적으로 분석해 보고 이러한 결과를 토대로 위성체 전위 변화에 우주환경 변화가 어떤 영향을 주는지 연구하였다.

• Bulletin of the Korean Space Science Society
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• 2009.04a
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• pp.53.2-53.2
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• 2009

• The Science & Technology
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• s.511
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• pp.88-90
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• 2011

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.38 no.4
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• pp.389-394
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• 2010

This paper describes the conceptual design of mass memory unit for high speed data processing and mass memory management in the STSAT-3 compared to that of STSAT-2. The FPGA directly controls the data receiving from two payloads with the maximum 100Mbps speed and 32Gb mass memory management to satisfy these requirements. We used SRAM-based FPGA from XILINX having fast operating speed and large logic cells. Therefore, the Triple Modular Redundancy(TMR) and configuration memory scrubbing techniques will also be used to protect FPGA from Single Event Upset(SEU) in space.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.34 no.2
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• pp.96-100
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• 2006

We develop the Dual Head Star Tracker (DHST) to obtain the attitude information of science and Technology Satellite2 (STSAT-2). Because most of star sensor has only one head camera, star recognition is impossible when camera point to sun or earth. We therefore considered the DHST which can obtain star images from two spots simultaneously. That is, even though we fail a star recognition from an image obtained by one camera, it is possible to recognize stars from an image obtained by the other camera. In this paper, we introduce engineer model (EM) of the DHST and propose a star recognition and a star track algorithm.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2005.05a
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• pp.957-961
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• 2005

A satellite component must withstand vibration caused when launch vehicle acoustics and engine rumble transfer to it through its structural mount. Components shall be subjected to environmental tests after manufacturing process thus the environmental test conditions are needed for component level test including vibration and shock. This paper deals with derivation of component-level environmental test specifications, especially for solar panels of STSAT-2(Science & Technology SATellite-2). Sine sweep random vibration, and shock test conditions were generated for solar panels by assuming the satellite as single-degree-of-freedom system with a base excitation.

• Korean Journal of Remote Sensing
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• v.14 no.2
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• pp.137-148
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• 1998

An algorithm developed for the precision correction of high resolution satellite images is introduced in this paper. In general, the polynomial warping algorithm which derives polynomial equations between GCPs extracted from an image and a base map requires many GCPs well-distributed over the image. The precision correction algorithm described in this paper is based on a sensor-orbit-Earth geometry, and therefore, it is capable of correcting a raw image using only 2-3 GCPs. This algorithm estimates the errors on the orbit determination and the attitude of the satellite by using a Kalman filter. This algorithm was implemented, tested and integrated into the KITSAT-3 image preprocessing software.

• Bulletin of the Korean Space Science Society
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• 2002.10a
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• pp.47.2-47
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• 2002

• Bulletin of the Korean Space Science Society
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• 2006.04a
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• pp.54-54
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• 2006