• 천문학회지
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• 제35권4호
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• pp.221-227
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• 2002

Cassegrain interface module (CIM) of the fiber-fed high resolution echelle spectrograph has been designed and manufactured for the 1.8 m reflector at the Bohynsan Optical Astronomy Observatory. We also constructed a long slit spectrograph attached to this CIM, which would replace the earlier rather inefficient medium dispersion spectrometer. We present detailed description for design and manufacturing concepts of the CIM which consists of a slit assembly, slit monitoring system, calibration lamp system and a long slit spectrograph, in order to provide how the overall system and each part. are constructed. The preliminary performance test carried out so far seems to indicate a successful result.

• 천문학회보
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• 제25권2호
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• pp.54-54
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• 2000

• Journal of Astronomy and Space Sciences
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• 제17권2호
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• pp.211-220
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• 2000

Korea Astronomy Observatory(KAO) is working to retrofit its 1m robotic telescope in collaboration with a company (ACE, Astronomical Consultants & Equipment). The telescope system is being totally refurbished to make a fully automatic telescope which can operate in both interactive and fully autonomous robotic modes. Progress has been made in design and manufacturing of the telescope mount, mechanics, and optical performance system tests are being made for re-configured primary and secondary mirrors. The optical system is designed to collect 80% incident light within 0.5 arcsec with f/7.5 Ritchey-Chretien design. The telescope mount is an equatorial fork with a friction drive system. The design allows fully programmable tracking speeds with typical range of 15 arcsec/sec with accuracy of $\pm5$ arcsec/hour. The mount system has integral pointing model software to correct for refraction, and all mechanical errors and misalignments. The pointing model will permit positioning to better than 30 arcsec RMS within $75^{\circ}$ from zenith and 45 arcsec RMS elsewhere on the sky. The software is designed for interactive, remote and robotic modes of operation. In interactive and remote mode the user can manually enter coordinates or retrieve them from a computer file. In robotic mode the telescope controller downloads the coordinates in the order determined by the scheduler. The telescope will be equipped with a CCD camera and will be accessible via the internet.

• 천문학논총
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• 제18권1호
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• pp.51-60
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• 2003

This paper is the research and development including the system design and the prototype system building of the 400MHz wide-band digital autocorrelation spectrometer system for radio astronomy observation, which will be used as back-end signal processing unit of the Dual channel SIS receiver at Taeduk Radio Astronomy Observatory. So in this paper, we performed development of the high speed digitizing sampler, the circular memory buffer, and the correlator module for the 400MHz wide-band digital autocorrelator. This developed system will be use at TRAO after the housing and some calibration.

• Journal of Astronomy and Space Sciences
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• 제20권3호
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• pp.185-196
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• 2003

본 논문에서는 100㎓ 대역 우주전파 수신시스템의 국부발진시스템에 대한 설계연구를 다루었다. 이 시스템의 기본 발진기로는 온도변화에 따른 주파수 및 위상 안정도가 좋고, 컴퓨터 제어가 용이한 디지털 드라이버를 사용하는 YIG 발진기를 사용하였다. 전체 시스템은 YIG 발진기, 3체 배기, 고조파 믹서 및 triplexer 등의 부품을 사용하는 발진부와 정확하고 안정된 국부발진 주파수를 만들어 믹서로 인가될 수 있도록 하는 PLL 시스템으로 구분하여 설계되었다. 본 연구에서 설계된 국부발진 시스템은 PC를 사용해 자동 혹은 수동으로 국부발진 주파수를 lock 할 수 있도록 설계되었으므로 밀리미터파 대역의 단일 픽셀 수신기나 다중 픽셀 수신기에 활용될 수 있다.

• 한국우주과학회:학술대회논문집(한국우주과학회보)
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• 한국우주과학회 2004년도 한국우주과학회보 제13권2호
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• pp.70-70
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• 2004

• 천문학회보
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• 제24권1호
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• pp.50-50
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• 1999

• 천문학회보
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• 제24권2호
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• pp.72-72
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• 1999

• 한국우주과학회:학술대회논문집(한국우주과학회보)
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• 한국우주과학회 1999년도 한국우주과학회보 제8권2호
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• pp.64-64
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• 1999

No Abstract, See Full Text

• 천문학회보
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• 제25권1호
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• pp.53-53
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• 2000