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The Korean VLBI Network (KVN) is a radio astronomy observatory located in South Korea. It comprises three 21-meter radio telescopes that function as an interferometer, using the technique of very-long-baseline interferometry (VLBI). == Characteristics == The KVN has three main dishes, each of 21m diameter and at respective separations of 300-500 km. All three dishes are located on university campus. Two are on the Korean peninsula: Yonsei University (KY) and Ulsan University (KU), and the third is located on Jeju Island on the campus of Jeju International University (formerly Tamna University; KT). The KVN antennas are Cassegrain-types with alt-az mounts. Each telescope has a 21-m diameter main reflector with a focal length of 6.78 m. The main reflectors consist of 200 aluminum panels each with a manufacturing surface accuracy of 65 microns. A fourth telescope, the existing 14m dish located at the Taeduk Radio Astronomy Observatory, will be linked to the KVN in the future via optical fiber networks.〔http://kvn-web.kasi.re.kr/en/en_normal_info.php〕 KVN focuses on millimeter-wavelength VLBI, and is designed to make simultaneous measurements at four different observing frequencies: 22, 43, 86, and 129 GHz. The telescopes can operate together with VLBI networks in Japan and China the East Asian VLBI Network (EAVN). The EAVN consists of 19 antennae with a maximum baseline of 5000 km operating at 22 GHz; it can also operate at 43 GHz using only 9 antennae. The first fringes for EAVN at 22 GHz were successfully detected in 2009.〔 The KVN has also successfully been used for real-time VLBI between Korea and Europe.〔http://www.kasi.re.kr/View.aspx?id=report&page=2&si=False&sn=False&ss=True&sc=False&keyword=&pagesize=20&uid=3645〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Korean VLBI Network」の詳細全文を読む スポンサード リンク
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