http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
시간지연을 고려한 간접 되먹임 구조 칼만필터의 수치안정성 향상 기법
남성호,성창기,김태원,Nam, Seongho,Sung, Changky,Kim, Taewon 한국군사과학기술학회 2017 한국군사과학기술학회지 Vol.20 No.1
Most of weapon systems use aided navigation system which integrates inertial navigation and aiding sensors to compensate the INS errors increasing with the passage of time. Various aid sensors can be applied such as Global Navigation Satellite System (GNSS), radar, barometer, etc., but there might exist time delay caused by signal processing or transferring aid information. This time delay leads out-of-sequence measurements (OOSM) systems. Previously, optimal and suboptimal measurment update method for OOSM systems, where the time delay length are known, are proposed. However, previous algorithm does not guarantee the positive definite property of covariance matrix. In order to improve numerical stability for aided navigation using delayed-measurement, this paper proposes a new measurement covariance update algorithm be similar to Joseph-form in Kalman filter. Futhermore, we propose how to implement it in indirect feedback Kalman filter structure, which is commonly used in aided navigation systems, for time-delayed measurement systems. Simulation and vehicle test results show effectiveness of a proposed algorithm.
남성호,박수형,서주역,정재훈,이수용,김준현,김화정,김영규 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.7
Here we report the influence of thermal annealing temperature on the nanostructure and the performanceof polymer:polymer solar cells. The active layer was prepared with bulk heterojunction(BHJ) films of poly(3-hexylthiophene) (P3HT) and of poly(9,9-dioctylfluorene-co-benzothiadiazole)(F8BT) doped with (1S)-(+)-10-camphorsulfonic acid (CSA) (F8BT-CSA). The change in thenanostructure of the P3HT:F8BT-CSA films with thermal annealing temperature was investigatedby employing a synchrotron radiation grazing-incidence-angle X-ray diffraction (GIXD) technique. Results showed that the power conversion efficiency (PCE) of the P3HT:F8BT-CSA solar cells wasnoticeably improved by thermal annealing at 150 C, which could be attributed to the optimizednanostructure in the BHJ film at 150 C, as suggested by the GIXD measurements.