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조종철(Jong Chul Cho),김정원(Jeong Won Kim),황동환(Dong-Hwan Hwang),이상정(Sang Jeong Lee) 대한전기학회 2006 정보 및 제어 심포지엄 논문집 Vol.2006 No.1
This paper analyzes effect of the spinning vehicle on the GPS signal. In rapid spinning vehicles such as missiles and space rockets, carrier phase and frequency depend on the roll rate of the vehicle. It induces phase and frequency modulation caused by the roll rate. The modulated phase and frequency increase dynamic stress error of the tracking loop. Even though hight't order tracking loop can remove dynamic stress error, the dynamic stress error can not be remove in this case. In order to analyze the effect of the spinning vehicle on the GPS signal, the experiments me carried out. The experiment results show the modulation of the carrier frequency and phase caused by the' roll rate or the spinning vehicle.
신대식(Dae Sik Shin),조종철(Jong Chul Cho),김용현(Yong Hyun Kim),신미영(Mi Young Shin),한상설(Sang Sul Han),박찬식(Chansik Park),전향식(Hyang-Sig Jun),남기욱(Gi-Wook Nam),이상정(Sang Jeong Lee) 한국항공우주학회 2007 韓國航空宇宙學會誌 Vol.35 No.12
본 논문에서는 GPS, GPS 현대화, Galileo, SBAS 및 GBAS등의 항법 시스템을 모두 고려하여 한국 지역에서의 GNSS 무결성 감시의 가용성을 분석하였다. 현대화된 GPS, Galileo 및 SBAS를 사용하면 Cat. Ⅰ에 근접한 성능을 얻을 수 있음을 시뮬레이션을 통해 확인 하였다. 그러나 여전히 수직오차의 영향으로 Cat. Ⅱ 및 Ⅲ를 만족시키지 못하므로 GBAS와 같은 보다 개선효과가 큰 보강 항법 시스템이 필요함을 확인하였다. 본 논문의 연구 결과는 보강 시스템의 구축뿐 아니라 지역 위성항법시스템 구축을 위한 기초 자료로 활용될 수 있다. In this paper, integrity analysis in Korean region using GPS, modernized GPS, Galileo, SBAS and GBAS is given. The simulation results show that Cat. Ⅰ requirement can be met using modernized GPS and Galileo alone, however, Cat. Ⅱ and Ⅲ are not met even augmenting SBAS because of VPL. A more efficient augmentation such as GBAS reduces VPL to meet Cat. Ⅱ and Ⅲ requirements in Korean region. This result will be used to design and implement not only an augmentation system but also regional satellite navigation system.
GNSS 신호를 이용한 회전체의 롤 회전 속도 추정 기법
김정원(Jeong Won Kim),조종철(Jong Chul Cho),황동환(Dong-Hwan Hwang),이상정(Sang Jeong Lee) 제어로봇시스템학회 2008 제어·로봇·시스템학회 논문지 Vol.14 No.7
This paper proposes a roll rate estimation method for spinning vehicles. The carrier phase and frequency variations caused by spinning of vehicles are observed and the roll rate estimator is designed on the observation. The roll rate estimator consists of phase detector and zero crossing counter. The phase detector computes phase variation using in-phase and quadrature value from the correlator. By using zero crossing counter, the roll rate can be estimated since the output of phase detector is changed in proportion to the roll rate. Experiment a results show that estimated roll rate error is smaller than 0.0578Hz.
간섭신호 감쇄필터 설계를 위한 고분해능의 GPS 수신기 플랫폼 개발
김용현(Yong Hyun Kim),조종철(Jong Chul Cho),류메린(Mei Lin Liu),임덕원(Deok Won Lim),신미영(Mi Young Shin),박찬식(Chansik Park),이상정(Sang Jeong Lee) 제어로봇시스템학회 2008 제어·로봇·시스템학회 논문지 Vol.14 No.10
A GPS receiver platform has been developed to design an interference rejection filter and the platform is also able to evaluate performance of those filters. This platform consists of RF/IF part, data acquisition part and PC part. The RF/IF part converts RF signals to IF signals, the data acquisition part transmits the IF signals to PC using USB device. The PC part rejects the interferences with a filter and then it does navigation with GPS software receiver. The RF/IF part and data acquisition part had been validated with signal spectrum, and the PC part had been validated with the navigation results of GPS receiver. Finally, the entire platform including interference rejection filter has been confirmed with the navigation results in case that the GPS signals and interference entered this platform. As a result, the GPS receiver operated well against interference with 45㏈ JSR.