A NEW HARDWARE CORRELATOR IN KOREA: PERFORMANCE EVALUATION USING KVN OBSERVATIONS
文献类型：期刊论文
| 作者 | Lee, Sang-Sung1,2; Oh, Chung Sik1; Roh, Duk-Gyoo1; Oh, Se-Jin1; Kim, Jongsoo1,2; Yeom, Jae-Hwan1; Kim, Ho Ryoung1; Jung, Dong-Gyu1; Byun, Do-Young1; Jung, Taehyun1,2 |
| 刊名 | JOURNAL OF THE KOREAN ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2015-04-30 |
| 卷号 | 48期号:2页码:125-137 |
| 关键词 | Techniques: interferometric Instrumentation: interferometers Radio continuum: galaxies Masers |
| 英文摘要 | We report results of the performance evaluation of a new hardware correlator in Korea, the Daejeon correlator, developed by the Korea Astronomy and Space Science Institute (KASI) and the National Astronomical Observatory of Japan (NAOJ). We conduct Very Long Baseline Interferometry (VLBI) observations at 22 GHz with the Korean VLBI Network (KVN) in Korea and the VLBI Exploration of Radio Astrometry (VERA) in Japan, and correlated the aquired data with the Daejeon correlator. For evaluating the performance of the new hardware correlator, we compare the correlation outputs from the Daejeon correlator for KVN observations with those from a software correlator, the Distributed FX (DiFX). We investigate the correlated flux densities and brightness distributions of extragalactic compact radio sources. The comparison of the two correlator outputs shows that they are consistent with each other within < 8%, which is comparable with the amplitude calibration uncertainties of KVN observations at 22 GHz. We also find that the 8% difference in flux density is caused mainly by (a) the difference in the way of fringe phase tracking between the DiFX software correlator and the Daejeon hardware correlator, and (b) an unusual pattern (a double-layer pattern) of the amplitude correlation output from the Daejeon correlator. The visibility amplitude loss by the double-layer pattern is as small as 3%. We conclude that the new hardware correlator produces reasonable correlation outputs for continuum observations, which are consistent with the outputs from the DiFX software correlator. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | RADIO INTERFEROMETRY ; LINE INTERFEROMETRY ; TAPE-RECORDER ; EARLY SCIENCE ; VLBI NETWORK ; SPACE VLBI ; 43 GHZ ; SYSTEM ; TELESCOPES |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000354419900004 |
| 公开日期 | 2015-08-18 |
| 源URL | [http://119.78.226.72/handle/331011/18270]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Korea Astron & Space Sci Inst, Taejon 305348, South Korea 2.Korea Univ Sci & Technol, Taejon 305350, South Korea 3.Chinese Acad Sci, Shanghai Observ, Shanghai 200030, Peoples R China 4.Natl Astron Observ Japan, Mizusawa VLBI Observ, Mitaka, Tokyo 1818588, Japan |
| 推荐引用方式 GB/T 7714 | Lee, Sang-Sung,Oh, Chung Sik,Roh, Duk-Gyoo,et al. A NEW HARDWARE CORRELATOR IN KOREA: PERFORMANCE EVALUATION USING KVN OBSERVATIONS[J]. JOURNAL OF THE KOREAN ASTRONOMICAL SOCIETY,2015,48(2):125-137. |
| APA | Lee, Sang-Sung.,Oh, Chung Sik.,Roh, Duk-Gyoo.,Oh, Se-Jin.,Kim, Jongsoo.,...&Wajima, Kiyoaki.(2015).A NEW HARDWARE CORRELATOR IN KOREA: PERFORMANCE EVALUATION USING KVN OBSERVATIONS.JOURNAL OF THE KOREAN ASTRONOMICAL SOCIETY,48(2),125-137. |
| MLA | Lee, Sang-Sung,et al."A NEW HARDWARE CORRELATOR IN KOREA: PERFORMANCE EVALUATION USING KVN OBSERVATIONS".JOURNAL OF THE KOREAN ASTRONOMICAL SOCIETY 48.2(2015):125-137. |
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来源：上海天文台
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