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구문석,김영준,소형민,오상헌,김성철,황동환 사단법인 항법시스템학회 2016 Journal of Positioning, Navigation, and Timing Vol.5 No.2
Since the Global Navigation Satellite System (GNSS) may not provide navigation information due to external interferences, many countries have plans to prepare a backup system for this situation. One of the possible GNSS backup systems is a multiple radio positioning integration system in combination with the terrestrial radio navigation system. Before constructing such a GNSS backup system, M&S software is needed to analyze if the system satisfies the performance the required navigation performance. This study presents requirements of M&S software for coverage analysis of the navigation system, and proposes an M&S software design scheme on the basis of the requirements. The M&S software is implemented, and coverage analysis is performed to verify the validity of the proposed design scheme.
상용 GPS 신호처리 칩셋 기반의 초강결합 GPS/INS 통합시스템 설계
구문석,임덕원,오상헌,황동환 제어로봇시스템학회 2011 제어로봇시스템학회 국내학술대회 논문집 Vol.2011 No.5
The ultra-tightly coupled GPS/INS integration system is known to be a method to provide an accurate navigation solution and high anti-jamming capability dynamic environment. Since the correlator outputs of the GPS receiver are measurements of the integration Kalman filter in the method, a different hardware configuration from the loosely and/or tightly-coupled integration method should be required. A COTS(Commercial Off-The-Shelf) GPS signal processing chipset based ultra-tightly coupled GPS/INS integration system design method is proposed.
구문석,김영준,최광호,소형민,오상헌,김성철,이형근,황동환,Koo, Moonsuk,Kim, YoungJoon,Choi, Kwang-Ho,So, Hyoungmin,Oh, Sang Heon,Kim, Seong-Cheol,Lee, Hyung-Keun,Hwang, Dong-Hwan 한국군사과학기술학회 2015 한국군사과학기술학회지 Vol.18 No.5
Even though GNSS provides highly accurate navigation information all over the world, it is vulnerable to jamming in the electronic warfare due to its weak signal power. The United States and Korea have plans to use terrestrial navigation systems as back-up systems during outage of GNSS. In order to develop back-up systems of GNSS, an M&S software platform is necessary for performance evaluation of various vehicle trajectories and integrated navigation systems. In this paper a design method of an M&S software is proposed for evaluation of multiple radio positioning integration systems. The proposed M&S software consists of a navigation environment generation part, a navigation algorithm part, a GUI part and a coverage analysis part. Effectiveness of the proposed design method is shown by implementing an M&S software for the GPS, DME and eLoran navigation systems.
GPS/DME 통합항법시스템에서 전파고도계의 효과적인 사용
구문석,소형민,오상헌,황동환,Koo, Moonsuk,So, Hyoungmin,Oh, Sang Heon,Hwang, Dong-Hwan 한국군사과학기술학회 2016 한국군사과학기술학회지 Vol.19 No.2
Many researches on use of local ground navigation systems can be found to overcome vulnerability of GNSS. Effective use of an altimeter is proposed in GNSS/DME integrated navigation systems. A weighted DOP based on statistics of measurement error is derived for a given vehicle motion trajectory. From the derived DOP, the vertical error is estimated. By comparing the estimated vertical error with error specification of the altimeter, use of the altimeter is determined in the GPS/DME integrated navigation systems. In order to show effectiveness of the proposed method, 50 times Monte-Carlo simulations were performed for a GPS/DME integrated navigation system. The results show that the proposed method gives more accurate navigation outputs when the number of GPS satellites in view varies.
구문석,오상헌,황동환 사단법인 항법시스템학회 2012 Journal of Positioning, Navigation, and Timing Vol.1 No.1
In this paper, design of an error model is presented in which the bias characteristic of the MEMS IMU is taken into consideration for performance enhancement of the MEMS IMU-based GPS/INS integrated navigation system. The drift bias of the MEMS IMU is modeled as a 1st-order Gauss-Markov (GM) process, and the autocorrelation function is obtained from the collected IMU data, and the correlation time is estimated from this. Prior to obtaining the autocorrelation function, the noise of IMU data is eliminated based on wavelet. As a result of simulation, it is represented that the parameters of error model can be estimated correctly only when a proper denoising is performed according to dynamic behavior of drift bias, and that the integrated navigation system based on error model, in which the drift bias is considered, provides more correct navigation performance compared to the integrated navigation system based on error model in which the drift bias is not considered.