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고성능 기준 센서를 이용한 저급 MEMS IMU 오차보정
장근형,천세범,성상경,이은성,전향식,이영재,Chang, Keun-Hyung,Chun, Se-Bum,Sung, Sang-Kyung,Lee, Eun-Sung,Jun, Hyang-Sig,Lee, Young-Jae 한국정보통신학회 2008 한국정보통신학회논문지 Vol.12 No.10
항체가 정밀한 항법 정보를 얻기 위해서는 관성 센서의 초기 오차에 대한 보정이 매우 중요하다. 본 논문에서는 레이트 테이블과 고성능 센서를 기준 센서로 사용하여, 저급 MEMS 관성 센서 오차 보정에 따르는 비용과 효율성의 어려움을 극복하는 방법을 제안하였다. 초기 오차 보정 과정에서 기준 센서와 타겟 센서에 같은 동적 입력을 인가한 후 결과를 분석하였다. 실험 결과를 통해 제안된 초기 오차 보정 방법이 실제로 매우 효율적이며 유용함을 확인할 수 있었다. Calibration of an MEMS inertial measurement unit is very important process for obtaining precise navigation performance. In this paper, one method is proposed to overcome a limitations on cost and efficiency using a relatively higher grade sensor and a rate table. The same dynamic input is applied to both the reference and the target sensors during and after calibration process, then the results are analyzed. The experimental results show that the proposed method is very effective and useful in practice.
金源,張根亨,曺英鎬,沈學輔 慶北大學校 1992 論文集 Vol.52 No.-
This report is an investigation of revestagation and secondary succession in the burned area. The forest fire occurred in Mt. Ch'olye on April, 1989. After logging of the burned pine tree, the seedlings of Pinus koraiensis were planted by the replaceable plant in there. The results are summarized as follows : Dorminant species in the first year(B-1) after fire were Miscanthus sinensis var. purpurascens, Carex humilis and Duchesnea chrysantha and those in the second year(B-2) after fire Miscanthus sinensis var. purpurascens, Carex humilis and Lespedeza cyrtobotrya. the biological spectra in both burned and unburned areas were H-D_1-R_5-e type. The indices of similarity showed that B-1 and B-2 was 0.667, B-1 and U 0.526, and B-2 and U 0.500. Degree of succession(DS) was 181, 345, 1090 and species diversity(H) 2.35, 2,73, 2.54 and evenness index(e) 0.61, 0.73, 0.73 and dominance index(C) 0.17, 0.11, 0.15, in B-1 and U site, respectively. Biomass of B-2 site was higher than that of B-1 site. Litter amount(kg/m^2) of burned and unbrurned areas were 0.017 and 0.863. Soil pH, content of total nitrogen, organic matter, organic carbon, and water holding capacity of burned area were higher than those of unburned area while content of available phosphorus, exchangeable pottassium, C/N ratio, and water content of unburned area were higher than those of burned area, respectively.