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- 저자 : 박찬식 ( Park Chansik ) (검색결과 95 건)
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GNSS 자세결정시스템의 미지정수 결정을 위한 기저선 제약을 갖는 LAMBDA 기법
박찬식(Chansik Park),P.J.G. Teunissen 제어로봇시스템학회 2008 제어·로봇·시스템학회 논문지 Vol.14 No.6
In this paper, an efficient integer ambiguity resolution method for GNSS attitude determination system is described. The proposed method solves the integer least-squares with quadratic equality constraints(ILSQE) problem and shows an expansion of the LAMBDA method can be used to solve it. The solution of ILSQE is shown and an efficient implementation with a LAMBDA based method is given. The method is compared with some other methods. The results of static and dynamic tests show the dramatic improvement of the success rates of integer ambiguity resolution.
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박찬식(Chansik Park),임재걸(Jaegeol Yim) 제어로봇시스템학회 2010 제어·로봇·시스템학회 논문지 Vol.16 No.12
This paper proposes three positioning algorithms using TOA measurements: 1) The well-known linearization method using Taylor series, 2) a modified Savarese method considering measurement noise, which does not need linearization, and 3) a modified Bancroft method where TOA measurements instead of pseudorange measurements are considered. Furthermore, through an error analysis, for Savarese method, divergence of altitude is anticipated if the transmitters are located at the same height. To prevent height divergence, the Savarese method is modified again for receivers which assumed moving on the even plane. Error analysis also shows the relationship between Bancroft and Savarese method. From the analysis it is expected that the performance of Savarese method is worse than Bancroft method because of error amplification during difference operation. Experiments using real TOA measurement from the time difference of ultra sound and RF validate the proposed methods and show that analysis is correct.
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박찬식(Chansik Park),이세복(Sebok Lee),김영광(Youngkwang Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Steering-pull in vehicle appears due to cross wind, road crown, wheel alignment and so on. In this study, real-time steering-pull compensation control logic, which is activated in continuous lateral load, is proposed. This system is composed of three subsystems such as signal pre-processing module, steering-pull estimation module and compensation steering-torque module. The algorithm is developed and verified by using vehicle test.
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