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항체 자세 변화에 따른 GPS 수신기의 성능분석 기법 연구
유기정,Yoo Ki-Jeong 한국군사과학기술학회 2004 한국군사과학기술학회지 Vol.7 No.2
GPS is widely used in various applications since GPS receivers are capable of measuring precise position and velocity in any weather condition for a relatively low cost. However, GPS requires more than four simultaneously visible GPS satellites for optimal performance. In high-motion, high-attitude-changing applications, there exist some situations where less than four satellites are visible or where the dilution of precision (DOP) is high. In this paper, we propose a simulation algorithm that predicts the performance of GPS navigation according to changes in vehicle attitude. We have compared simulation results with experimental results, where simulation results of the proposed algorithm are shown to closely match actual experimental data. This algorithm could be used to predict GPS navigational performance and to determine optimal GPS antenna position.
RLG Trapping 신호처리 기법의 성능개선에 관한 연구
유기정(Ki-Jeong Yoo),김천중(Cheon-Joong Kim),심규민(Kyu-Min Shim) 한국항공우주학회 2008 韓國航空宇宙學會誌 Vol.36 No.10
본 논문은 RLG의 신호처리 기법인 Trapping 기법 적용시 각속도와 가속도의 측정시점 불일치에 의해 발생되는 오차를 보상하는 기법에 관한 연구이다. RLG의 대표적인 신호처리 기법인 Stripping 신호처리 기법과 Trapping 신호처리 기법에 대하여 각 기법의 오차요인을 분석하고 이에 대한 모델링을 수행하였다. 그리고 Trapping 기법 적용시 각속도와 가속도 측정시점 불일치에 의해 발생되는 오차에 대한 모델링을 통하여 항법오차에 미치는 영향을 분석하였으며 이를 감소시키기 위한 새로운 신호처리 기법을 제안하고 시뮬레이션 및 시험을 통하여 이에 대한 성능분석 결과를 제시하였다. 성능 분석결과 본 논문에서 제시한 신호처리 기법이 기존의 방법에 비하여 항법오차를 크게 감소시키는 것을 확인할 수 있었다. In this paper, we propose the new method to decrease the navigation error by measurement time synchronization error in RLG Trapping signal processing. There are two methods to eliminate the dither motion in RLG. One is the stripping signal processing mothod. Another is the trapping signal processing method. This two methods have various error sources in measurement output. We perform the error modelling and analysis for the measurement time synchronization error between angular rate from RLG and acceleration from accelerometer in the trapping signal processing method. and we verify navigation performance through simulation and experiment. Results of simulation and experiment show that the proposed method is very effective in dereasing the navigation error.
강결합 방식의 INS/GPS 시스템에서의 자세 오차 추정 성능 비교
유해성,김천중,유기정,이윤선,박흥원,Yu, Hae-Sung,Kim, Cheon-Joong,Yoo, Ki-Jeong,Lee, Youn-Seon,Park, Heung-Won 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.1
This paper addresses the performance comparisons of the GPS pseudorange and pseudorange rate measurements in the tightly coupled INS/GPS Navigation systems. Even though the two measurements have the same ability in estimating level attitude errors, pseudorange rate has an advantage in improving estimating heading attitude error performance. The performance of pseudorange and pseudorange rate measurements is compared in numerical simulations and van test.
김천중(Cheon-Joong Kim),유기정(Ki-Jeong Yoo),김현석(Hyeon-Suk Kim),유준(Joon Lyou) 제어로봇시스템학회 2011 제어·로봇·시스템학회 논문지 Vol.17 No.11
LLNS (Laser Inertial Navigation System) consists of RLG (Ring Laser Gyroscopes)/accelerometers and provides real-time navigation information to the target system. Therefore it is very important to make a decision in the real time whether LINS is in the normal operation or not. That is called a fault detection method. In this paper, we propose the fault detection method of LINS based on the overlapping model. We also show that the fault detection probability is increased through overlapping the hardware model and the software model. It is verified through the long-term operation and RAM (Reliability Availability Maintainability) analysis of LINS that the fault detection method proposed in this paper is able to detect about 97% of probable system failures.