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VDIF (VLBI Data Interchange Format) as a common data format in e-VLBI era.

VDIF (VLBI Data Interchange Format) as a common data format in e-VLBI era. M. Sekido (NICT) M.Kettenis(ATNF), C.Phillips(JIVE), A.Whitney(MIT/Haystack), Y.Koyama(NICT), H.Harai(NICT). East-Asia VLBI Workshop 18 Mar. 2009 @ Korea.

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VDIF (VLBI Data Interchange Format) as a common data format in e-VLBI era.

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  1. VDIF(VLBI Data Interchange Format)as a common data format in e-VLBI era. M. Sekido (NICT) M.Kettenis(ATNF), C.Phillips(JIVE), A.Whitney(MIT/Haystack), Y.Koyama(NICT), H.Harai(NICT) East-Asia VLBI Workshop 18 Mar. 2009 @ Korea

  2. Compatibility between VLBI systems has been a headache issue for a long time. K3,Mark3,VLBA K4,VSOP S2

  3. VSI-H VSI-H VSI-S RTP/RTCP Mark5B VSI-E VSI-H E-VLBI VSI-H Standard interface:VSI-H, VSI-S, VSI-E VOA-200 VOA-200 ADS1000 Correlator Sampler DIM DOM

  4. Correlation Agent (Cor_srv2.pl) Correlation Agent (Cor_srv2.pl) Mark5B Correlation Agent (Cor_srv2.pl) Correlation Agent (Cor_srv2.pl) eVLBI: Data transport media has replaced by HDD/network. Correlators:Soft/Hard Network Mk5 Network K5

  5. VDIF Standard Data format (VDIF) • Discussion in eVLBI WS@Shanghai(2008) • Task Force member (A.Whitney, M.Kettenis, C.Phillips, M.Sekido) as regional representatives have discussed by E-mail. EVN NRAO NAOJ KA냐 SHAO

  6. Basic Structure = Frame format Data Header Data Header Data Header 32bit/word VDIF ”standardized transport-independent VLBI data-interchange format that is suitable for all types of VLBI data transfer, including real-time and near-real-time e-VLBI, as well as disk-file storage.” Protocol（TCP/IP,UDP/IP, etc…,data file) is not defined, this time. You can use any… DAS Correlator VDIF Data format (contents in frames) is defined

  7. D D D D D D D D D Multi (single-channel) streams to different destinations H H H H H H H H H single stream of Multi-channel data File FTP,HTTP,Tsunami,or any other File D D D D D D D D D H H H H H H H H H VDIF Possible Usage of VDIF:

  8. VDIF Header Format Sequencial #Frame Legacy mode:16byte or 32byte header Half Year Counter since 2000.0 Invalid flag Frame size Extended Version Nch Complex flag Station ID ID for multi-stream Bit User Defined header field Version No.

  9. VDIF Data format 1bit/sample 2bit/sample 3bit/sample 4bit/sample

  10. VDIF Data format (Complex data) 1bit/sample 2bit/sample 3bit/sample 4bit/sample

  11. 1024-16-2+64-8-8 ⇒ 32Msps-2bit-16ch stream + 1Msps-8bit-8ch stream VDIF VDIF Data Stream Format Designator • 1024-16-2-1 ⇒32Msps-2bit-16ch • 1024-16-2-4 ⇒ 32Msps-2bit-16ch via 4ch-4 streams

  12. VDIF Summary • VDIF has a scope of • Transport Independent Standard VLBI Data Format • Wide Flexibility for VLBI Applications (Geodesy, Astronomy, Spacecraft) • Multi stream for distributed processing • Standard Transport Protocol may be discussed in the next.

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