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Performance Evaluation of VLBI Correlation Subsystem Main Product  

Oh, Se-Jin (한국천문연구원)
Roh, Duk-Gyoo (한국천문연구원)
Yeom, Jae-Hwan (한국천문연구원)
Oyama, Tomoaki (일본국립천문대)
Park, Sun-Youp (충북대학교)
Kang, Yong-Woo (한국천문연구원)
Kawaguchi, Noriyuki (일본국립천문대)
Kobayashi, Hideyuki (일본국립천문대)
Kawakami, Kazuyuki (일본 Elecs Industry Co. Ltd.)
Publication Information
Journal of the Institute of Convergence Signal Processing / v.12, no.4, 2011 , pp. 322-332 More about this Journal
Abstract
In this paper, we introduce the 1st performance evaluation of VLBI Correlation Subsystem (VCS) main product, which is core system of Korea-Japan Joint VLBI Correlator (KJJVC). The main goal of the 1st performance evaluation of VCS main product is that the perfection of overall system will be enhanced after checking the unsolved part by performing the experiments towards various test items at the manufacturer before installation of field. The functional test was performed by including the overflow problem occurred in the FFT re-quantization module due to the insufficient of effective bit at the VCS trial product in this performance test of VCS main product. Through the performance test for VCS main product in the factory, the problem such as FFT re-quantization discovered at performance test of VCS trial product in 2008 was clearly solved and the important functions such as delay tracking, daly compensation, and frequency bining were added in this VCS main product. We also confirmed that the predicted correlation results (fringe) was obtained in the correlation test by using real astronomical observed data(wideband/narrow band).
Keywords
VLBI Correlation Subsystem (VCS) main product; Re-quantization; FPGA;
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