Dr. Takaaki Jike Profile

Dr. Takaaki Jike

at National Astronomical Observatory of Japan

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Proceedings Article | 19 July 2024 Poster

Development of the new digital back-end system (OCTAVE-DAS) and correlator system for VERA, JVN, and EAVN

Tomoaki Oyama, Yusuke Kono, Aya Yamauchi, Takaaki Jike, Syunsaku Suzuki, Kazuhiro Hada, Yu Asakura, Noriyuki Kawaguchi

Proceedings Volume 13096, 130963B (2024) https://doi.org/10.1117/12.3019554

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The new VLBI data acquisition system (OCTAVE-DAS) have been developed for VLBI Exploration of Radio Astrometry (VERA) and the East Asia VLBI Network (EAVN) based on the VSI-H and VDIF specifications at the National Astronomical Observatory of Japan. It consists of 1) a high speed 1-20 Gsps 3-10 bit RF(-30 GHz) direct sampler with DBBC functions, 2) media converter between one 10 GigE port and four 2 Gbps input and output ports conformable to VSI-H, 3) new VLBI recorders have functions of both recording and playing at a maximum rate of 32 Gbps and 4) Gbit real-time correlator and software correlator system using GPGPU technology. These OCTAVE-DAS instruments are connected via 10 GigE network with VDIF and VSI specifications. These components have been used for VERA, Japanese VLBI Network (JVN) and EAVN. We will report on current status and results of scientific broad-band (16 Gbps) VLBI test observation using the OCTAVE-DAS.

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