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156 results on '"Sanguk Lee"'

153. KOMPSAT-2 S/W Simulator.

Author

Doo-Kwon Baik, Sanguk Lee, SungKi Cho, and Jae Hoon Kim

Abstract

In this paper, we present design and implementation features and validation of KOMPSAT-2 simulator (SIM). The SIM is implemented on PC server to minimize costs and troubles on embedding onboard flight software into simulator. Object oriented design methodology is employed to maximized S/W reusability, and XML is used for S/C characteristics data, TC, TM and Simulation data instead of expensive commercial DB. Consequently, we can reduce costs for the system development, efforts on embedding flight software. A simulation for science fine mode operation is presented to demonstrate the overall validation of SIM. SIM has been verified officially by various tests such as SIM subsystem test, MCE system integration test, interface test, site installation test, and acceptance test. They were performed successfully. [ABSTRACT FROM AUTHOR]

Published
2005

154. Mitigation Method of Spacecraft Momentum by Solar Radiation Pressure.

Author

Seongkyun Jeong, Sanguk Lee, Hae-yeon Kim, and Jaehoon Kim

Subjects
*GEOSTATIONARY satellites, *SPACE vehicles, *SOLAR radiation, *PROPELLANTS, *ROCKET fuel, *ARTIFICIAL satellites
Abstract

The article analyzes the momentum mitigation method for a single-solar-array satellite using solar radiation pressure and mass-center portion management. The methods for reducing accumulated momentum using solar radiation pressure included relocation of mass center of spacecraft by propellant blowdown, orthogonal positioning of the solar array, and solar array offset angle control. It discusses simulation analysis of momentum dumping using multipurpose geostationary satellite, Communication, Ocean and Meteorological Satellite (COMS), as the example.

Published
2009
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155. GPS L5 Acquisition Schemes for Fast Code Detection and Improved Doppler Accuracy.

Author

Inone Joo, Cheonsig Sin, Sanguk Lee, and Jaehoon Kim

Subjects
MOBILE communication systems, TELECOMMUNICATION systems, DATA transmission systems, ARTIFICIAL intelligence, DIGITAL computer simulation, ELECTRONIC data processing, TELECOMMUNICATION equipment
Abstract

In this letter, we propose GPS L5 acquisition schemes to detect a fast code phase and improve the accuracy of the Doppler frequency. The proposed approach is based on the code-phase changes which occur during the acquisition processing time originating in the Doppler frequency. The proposed schemes detect a fast code phase within about 1 chip near the estimated code phase and improve the accuracy of the Doppler frequency by up to about 4 times in comparison with the popular Septentrio receiver. The feasibility of the proposed schemes is demonstrated through simulation. [ABSTRACT FROM AUTHOR]

Published
2010
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156. STANDARDIZATION OF GNSS THREAT REPORTING.

Author

DUMVILLE, MARK, YEQIU YING, FRYGANIOTIS, DIMITRIOS, BHUIYAN, ZAHIDUL, THOMBRE, SARANG, WAERN, ÅSA, ELIARDSSON, PATRIK, PÖLÖSKEY, MARTIN, HILL, STEVE, MANIKUNDALAM, VENKATESH, SANGUK LEE, and GONZALEZ, JOAQUIN REYES

Subjects
GLOBAL Positioning System, SECURITY management, STANDARDS, GPS receivers, NAVIGATION
Abstract

The article focuses on findings from monitoring by the International Knowledge Exchange, Experimentation and Exploitation (STRIKE3) to increase use of Global Navigation Satellite System (GNSS) within safety, security, governmental and regulated applications. It mentions international partnership to develop, negotiate, and promote standards for threat reporting and receiver testing. It also mentions positioning, navigation and timing needs met by GNSS.

Published
2017

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