Seongwhan Lee

Development of a Data Reduction algorithm for Optical Wide Field Patrol

The detector subsystem of the Optical Wide-field Patrol (OWL) network efficiently acquires the position and time information of moving objects such as artificial satellites through its chopper system, which consists of 4 blades in front of the CCD camera. Using this system, it is possible to get more position data with the same exposure time by changing the streaks of the moving objects into many pieces with the fast rotating blades during sidereal tracking. At the same time, the time data from the rotating chopper can be acquired by the time tagger connected to the photo diode. To analyze the orbits of the targets detected in the image data of such a system, a sequential procedure of determining the positions of separated streak lines was developed that involved calculating the World Coordinate System (WCS) solution to transform the positions into equatorial coordinate systems, and finally combining the time log records from the time tagger with the transformed position data. We introduce this procedure and the preliminary results of the application of this procedure to the test observation images.

Calibration of TEPC for CubeSat Experiment to Measure Space Radiation

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Development of Flight Software for SIGMA CubeSat

ABSTRACT SIGMA(Scientificcubesat with Instrumentsfor GlobalMagnetic field and rAdiation)CubeSathasbeendevelopedformagneticfieldmeasurementoftheEarthandspaceradiationmeasurementatKyungHeeuniversity.Theflightsoftwareplaysimportantrolesincontrollingthesatelliteandprocessingthedatainthespacemission.Inthispaper,theFlightSoftwarehasbeenimplementedtoprocessallthetasksintheonethreadwithoutRTOS(RealTimeOperatingSystem).ThisisaneffectivemothednotonlytoconcentratethespacemissionofCubeSatbutalsotoreducetheoverheadoftheFlightSoftwarebyconsideringthemissionperformproceduresandthesystemcontrolmethods. 초 록 SIGMA(ScientificcubesatwithInstrumentsforGlobalMagneticfieldandrAdiation)큐브위성은 근 지구 자기장 세기와 우주 방사선량 측정을 위해 경희대학교에서 개발한 초소형 인공위성이다.우주 임무 수행을 위해 비행 소프트웨어는 위성을 제어하고 데이터를 처리하는 중요한 역할을 담당한다.본 연구에서는 SIGMA큐브위성의 임무 수행을 위해 비행 소프트웨어를 구현한 것으로서 일반적으로 임베디드 시스템에서 사용하는 실시간 운영체제를 사용하지 않고 단일 프로세스 내에서 모든 태스크를 처리하도록 구현하였다.이는 SIGMA큐브위성의 임무 수행 절차와 시스템 제어 방법을 고려한 것으로서 소프트웨어의 오버헤드(overhead)를 낮추고 임무 수행에 집중할 수 있는 효과적인 방법이다.KeyWords:CubeSat(큐브위성),FlightSoftware(비행 소프트웨어),SIGMAKHUSAT-3(시그마 KHUSAT-3)

Construction of a Thermal Vacuum Chamber for Environment Test of Triple CubeSat Mission TRIO-CINEMA

TRiplet Ionospheric Observatory-CubeSat for Ion, Neutron, Electron & MAgnetic fields (TRIO-CINEMA) is a CubeSat with 3.14 kg in weight and 3-U (10 × 10 × 30 cm) in size, jointly developed by Kyung Hee University and UC Berkeley to measure magnetic fields of near Earth space and detect plasma particles. When a satellite is launched into orbit, it encounters ultrahigh vacuum and extreme temperature. To verify the operation and survivability of the satellite in such an extreme space environment, experimental tests are conducted on the ground using thermal vacuum chamber. This paper describes the temperature control device and monitoring system suitable for CubeSat test environment using the thermal vacuum chamber of the School of Space Research, Kyung Hee University. To build the chamber, we use a general purpose thermal analysis program and NX 6.0 TMG program. We carry out thermal vacuum tests on the two flight models developed by Kyung Hee University based on the thermal model of the TRIO-CINEMA satellite. It is expected from this experiment that proper operation of the satellite in the space environment will be achieved.