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한일공동VLBI상관기에서 관측 데이터의 동기재생처리를 위한 RVDB 시스템 개발과 성능시험
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  • 한일공동VLBI상관기에서 관측 데이터의 동기재생처리를 위한 RVDB 시스템 개발과 성능시험
저자명
오세진,노덕규,염재환,정현수,이창훈,김광동,김효령,Oh. Se-Jin,Roh. Duk-Gyoo,Yeom. Jae-Hwan,Chung. Hyun-Soo,Lee. Chang-Hoon,Kim. Kwang-Dong,Kim. Hyo-Ryo
간행물명
천문학논총
권/호정보
2008년|23권 2호|pp.91-107 (17 pages)
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한국천문학회
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이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
서지반출

기타언어초록

In this paper, we introduce the performance evaluation and development of Raw VLBI Data Buffer(RVDB) system for the synchronized playback processing of observed data in Korea-Japan Joint VLBI Correlator(KJJVC). The high-speed correlation processing system is under development so that the radio data obtained with 8192 channels and 8 Gbps speed from 16 stations will be able to be processed. When the recorded data of each station are played to correlator, the time synchronization of each station is very important because the correlator should process the data obtained with same time and condition. There are many types of recorder systems in the East Asia VLBI Network (EAVN). Therefore it is required to prepare the special time synchronized playback processing system to synchronize the time tag of observed data. The developed RVDB system consists of Data Input Output(DIO), 10GbE switch, and Disk Data Buffer(DDB). It can record the data with maximum 2 Gbps speed, and can play back the data to correlator with nominal 2 Gbps speed. To enable to play back the data of different playback system to the correlator, we developed the high-speed time synchronized playback processing system. We carried out the experiments of playing back and correlation for gigabit correlator and VCS trial product so as to confirm the performance of developed time synchronized playback processing system. In case of online and offline playing back experiment for gigabit correlator, we confirmed that the online and offline correlation results were the same. In case of playing back experiment for VCS trial product, we verified that the wide band and narrow band correlation results were also the same. Through the playing back experiments of RVDB system, the effectiveness of developed RVDB system was verified. In this paper, the system design, construction and experimental results are shown briefly.