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구훤준,박찬식,이상정 한국항공우주학회 2016 한국항공우주학회 학술발표회 논문집 Vol.2016 No.4
범지구위성항법시스템(GNSS)의 반송파 위상을 이용하여 정밀측위를 할 경우 미지정수 결정이 필수적이다. 최근 미국은 GPS 현대화 계획에 따라 기존의 L1 및 L2 주파수에 L5를 추가하고 있다. 미지정수 결정을 위해 3개의 독립미지정수항을 사용하는 ARCE를 확장시켜, GPS 3개의 주파수를 사용하여 EWL 단계에서 구해진 미지정수를 이용하여 나머지 미지정수를 구하는 미지정수 결정기법(TF-ARCE)를 제안한다. 이를 통해 미지정수 검색범위를 줄이면서 참값결정확률 및 신뢰도가 높아질 것으로 기대한다. Ambiguity resolution is essential for the precision positioning using GNSS carrier phase measurements. Recently, United Stetes of America added to the existing L1 and L2 to L5 frequency according to the GPSS Modernization Plan. This paper propose the new ambiguity resolution technique, TF-ARCE which is obtained the dependent ambiguities from the ambiguities of EWL step using GPS three frequency. Using the TF-ARCE, the probability for true value and reliability will be grown with the reduction of search range.
무인항공기 자동착륙을 위한 활강궤적 추종 알고리듬 성능분석
최영현,구훤준,김종성,석진영,Choi, Young-Hyun,Koo, Hueon-Joon,Kim, Jong-Sung,Suk, Jin-Young 제어로봇시스템학회 2005 제어·로봇·시스템학회 논문지 Vol.11 No.3
Automatic landing of UAVs receives increasing interest these days, with increasing number of the developed UAV systems. In this paper, a glidepath tracking algorithm of the subscale UAV was proposed and the performance was analyzed. Flight data analysis shows that the existing autolanding flight control algorithm has a classical type glidepath control. This paper presents an alternative glidepath tracking strategy based on embedded flight control law. The performance of the proposed strategy was investigated through the TDP(Touch Down Point) error analysis with regard to various flight environment: steady headwind, atmospheric disturbance, communication transfer delay. It was verified that the proposed glidepath tracking strategy can be successfully applied to the practical autolanding of UAV systems.