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Development of Transmission Algorithm of VLBI Observation Data and Transmission Experiment Between Server and RVDB  

Yeom, Jae-Hwan (한국천문연구원)
Oh, Se-Jin (한국천문연구원)
Roh, Duk-Gyoo (한국천문연구원)
Jung, Dong-Kyu (한국천문연구원)
Oh, Chung-Sik (한국천문연구원)
Yun, Youngjoo (한국천문연구원)
Kim, Hyo-Ryoung (한국천문연구원)
Publication Information
Journal of the Institute of Convergence Signal Processing / v.15, no.4, 2014 , pp. 183-191 More about this Journal
Abstract
This paper describes the development of the observational data transmission algorithm for high-speed network in radio astronomy. For the preprocessing of VLBI data observed by radio telescope, data transmission algorithm uses the VDIF specification, VDIFCP, and UDP protocol by transferring VLBI data stored in a massive storage server with one-to-one correspondence between the server and the RVDB of Daejeon correlator. A transmission method is proposed, which reads the recorded data in Mark5B VSI format and trnasmits 2048 Mbps VLBI data by software through UDP packet transmission, while RVDB system is waiting for the transmitting data from the server. In order to check the effectiveness of the proposed method, the data transmission between the massive storage server and RVDB is conducted and the transmitted data is correlated by Daejeon correlator for the accurate comparison concerning the data before and after. The transmitted data is shown to be completely the same as the original data without any data transmission loss. Henceforth, the developed data transmission algorithm in this research is expected to be applied effectively as e-VLBI for KaVA network.
Keywords
Data Transmission Algorithm; VDIF; Daejeon Correlator;
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