간행물
Journal of Astronomy and Space Sciences KCI 등재 SCOPUS
- 발행기관 한국우주과학회
- 자료유형 학술지
- 간기 계간
- ISSN 2093-5587 (Print)2093-1409 (Online)
- 수록기간 1984 ~ 2022
- 주제분류 자연과학 > 천문학 자연과학 분류의 다른 간행물
- 십진분류KDC 443DDC 520
권호리스트/논문검색
제26권 4호 (2009년 12월) 25건
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Ionospheric Behaviors Over Korea Peninsula During the Super Geomagnetic Storm Using GPS Measurements
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지난 2005년 1월 4일 보현산 천문대(BOAO)의 BOES(BOao Echelle Spectograph)를 이용하여 Machholz(C/2004Q2) 혜성을 관측하였다. 이 논문에서는 Machholz 혜성의 고분산 분광 자료를 이용하여 미확인 분광선에 관한 연구를 수행하였으며 연구에 이용된 분광선의 파장 범위는 4800 ~ 8100A 영역이다. 기존에 있던 Swift-Tuttle 혜성 Brosen-Metcalf 혜성, Austin 혜성, 그리고 122P/de Vico 혜성의 자료들과 비교분석을 하였다. 다수의 미확인 분광선에 대한 원인물질을 알아냈고, 이러한 자료들은 앞으로 혜성 연구에 있어서 유용한 자료로 활용될 수 있을 것이다.
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In this paper, relative orbit of Low Earth Orbit satellites is determined using only GPS measurements and the effects of Equatorial Spread-F (ESF), that is one of biggest ionospheric irregularities, are investigated. First, relative orbit determiation process is constructed based on doubly differenced GPS observations. In order to see orbit determination performance, relative orbit of two GRACE satellites is estimated for one month in 2004 when no ESF is observed. The root mean square of the achieved baselines compared with that from K-Band Ranger sensor is about 2 » 3 mm and average of 95% of ambiguities are resolved. Based on this performance, the relative orbit is estimated for two weeks of two difference years, 2003 when there are lots of ESF occurred, and 2004 when only few ESF occurred. For 2003, the averaged baseline error over two weeks is about 15 mm. That is about 4 times larger than the case of 2004 (3.6 mm). Ionospheric status achieved from K-Band Ranging sensor also shows that more Equatorial Spread-F occurred at 2003 than 2004. Investigation on raw observations and screening process revealed that the ionospheric irregualarities caused by Equatorial Spread-F gave significant effects on GPS signal like signal loss or enhancement ionospheric error, From this study, relative orbit determination using GPS observations should consider the effect of Equatorial Spread-F and adjust orbit determination strategy, especially at the time of solar maximum.
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While it is well known that space environment can produce spacecraft anomaly, defining space environment effects for each anomalies is difficult. This is caused by the fact that spacecraft anomaly shows various symptoms and reproducing it is impossible. In this study, we try to find the conditions of when spacecraft failures happen more frequently and give satellite operators useful information. Especially, our study focuses on the geosynchronous satellites which cost is high and required high reliability. We used satellite anomaly data given by Satellite News Digest which is internet newspaper providing space industry news. In our analysis, 88 anomaly cases occurred from 1997 to 2008 shows bad corelation with Kp index. Satellite malfunctions were likely to happen in spring and fall and in local time from midnight to dawn. In addition, we found the probability of anomaly increase when high energy electron flux is high. This is more clearly appeared in solar minimum than maximum period
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We investigated ‘Song of the Sky Pacers, Adopted to the New Methods’ (ÿØ), the latest version of Joseon’s ‘Song of the Sky Pacers’ (Ø). Due to the influence of new knowledge on Chinese asterisms imported from the Ching dynasty, ‘Song of the Sky Pacers with New Star-Charts’ was written in the eighteenth century. However, the disagreement between song and star-charts was causing confusion in practical applications such as Joseon’s national examination for selecting astronomers. In order to improve this situation, Royal Observatory of the Joseon dynasty (nú) published ‘Song of the Sky Pacers, Adopted to the New Methods’ based upon star-charts and song in the Sequel of I-Hsiang-K’ao-ch’eng (aéúx0A). The New Song was edited by a middle-class professional astronomer Yi Jun-yang (¯]), and corrected by a nobleman Nam Byeong-gil (¢"Ø). We establish a brief biography of Yi Junyang. The New Song preserves the genuine characteristics of previous Joseon’s Song including the format of title of each lunar mansion and description on the location of the Milky Way in the asterisms. The description of the Milky Way was newly written based on the data in volume 31 and 32 of the Sequel of I-Hsiang-K’ao-ch’eng.
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This paper describes the Flight Dynamics Automation (FDA) system for COMS Flight Dynamics System (FDS) and its test result in terms of the performance of the automation jobs. FDA controls the flight dynamics functions such as orbit determination, orbit prediction, event prediction, and fuel accounting. The designed FDA is independent from the specific characteristics which are defined by spacecraft manufacturer or specific satellite missions. Therefore, FDA could easily links its autonomous job control functions to any satellite mission control system with some interface modification. By adding autonomous system along with flight dynamics system, it decreases the operator’s tedious and repeated jobs but increase the usability and reliability of the system. Therefore, FDA is used to improve the completeness of whole mission control system’s quality. The FDA is applied to the real flight dynamics system of a geostationary satellite, COMS and the experimental test is performed. The experimental result shows the stability and reliability of the mission control operations through the automatic job control.
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Seo, Yoon-Kyung, Rew, Dong-Young, Lim, Hyung-Chul, Park, In-Kwan, Yim, Hong-Suh, Jo, Jung-Hyun, Park, Jong-Uk
Korea Astronomy and Space Science Institute (KASI) has been developing one mobile and one stationary SLR system since 2008 named as ARGO-M and ARGO-F, respectively. KASI finished the step of deriving the system requirements of ARGO. The requirements include definitions and scopes of various software and hardware components which are necessary for developing the ARGO-M operation system. And the requirements define function, performance, and interface requirements. The operation system consisting of ARGO-M site, ARGO-F site, and Remote Operation Center (ROC) inside KASI is designed for remote access and the automatic tracking and control system which are the main operation concept of ARGO system. To accomplish remote operation, we are considering remote access to ARGO-F and ARGO-M from ROC. The mobile-phone service allows us to access the ARGO-F remotely and to control the system in an emergency. To implement fully automatic tracking and control function in ARGO-F, we have investigated and described the requirements about the automatic aircraft detection system and the various meteorological sensors. This paper addresses the requirements of ARGO Operation System.
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