E-VLBI Development in NICT
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1 E-VLBI Development in NICT
2 E-VLBI Activity in NICT E-VLBI Project JGN2 Sympo07 Demo: real-time e-vlbi with Haystack Realtime e-vlbi(kashima,tsukuba,gifu,yamaguchi,usuda) Ultra-rapid UT1 measurement (Onsala,Tsukuba,Metsahovi) 6Gbps S/X observation on Kashima-Koganei(100km) baseline. E-VLBI demonstration (ATNF-Kshima-Seashan) for today Hardware development Two types of K5 system(k5/vssp, K5/VSI) ADS-3000plus(DBBC) development Benefit of Standard
3 JGN2Sympo2007 with Haystack Mark5B
4 Collaborators: R.Haas(Onsala), J.Ritakari, J.Wagner(Metsahovi), S.Kurihara, K.Kokado(GSI) E-VLBI Projct(1) Ultra-rapid UT1 Experiment Onsala20m (Sweden Within 5 min after the session, UT1 has derived! Tsukuba32m GSI) Abiline/ Internet2 TransPAC Metsahovi14m (Finland Geant2 JGN2 APAN Kashima34m NICT) NorduNET
5 E-VLBI Projct(1) Ultra-rapid UT1 measurement DAS, Transport, Processing 128/ 256/ 512Mbps Onsala20m (Sweden Metsahovi14m (Finland Mark5 Mark5 VSIB (Metsahovi) Work shared collaboration Tsunami/UDP Observation and data transport at European side. Software Converter (K5 package) Observation and Correlation processing at Japense side. Mk5 K5 K5/VSSP K5/VSSP K5 Correlation processing by K5 software correlator on cluster of PCs
6 E-VLBI Projct(1) Prediction(BulletinA),EOPc04, and e-vlbi
7 E-VLBI Projct(1) Rapid Solution (Bulletin-A) and e-vlbi EOPc04
8 E-VLBI Projct(2) Success of 8Gbps real-time VLBI Kashima 34m Koganei 11m NICT,Kashima Headquater NICT, Tokyo 1１０km JGN2 thernet E 10G- VSI-H x4 VSI-H x4 VOA200
9 VSI-H, VSI-S, VSI-E VSI-H VSI-H VSI-S RTP/RTCP Mark5B VSI-H VSI-E E-VLBI Correlator Sampler DIM DOM VSI-H
10 E-VLBI Projct(2) 6Gbps routine VLBI for V773tau Monitoring of Flux S/X dual Freq. It is expected flare up with binary orbiting period. Variation of Spectrum index associated with orbiting period. Koganei 11m Name:V773 Tau A d=148pc Binary stars M:1.5M 1.3M a=0.4au P=51 days Kashima 34m JGN2 thernet E 10G- VOA200
11 E-VLBI Projct(3) The first real-time e-apt Kashima 34m Telescope Seattle Shanghai 25m Telescope CSTNET JGN2Plus AARNet Los Angeles ATCA 22m Telescope Mopra 22m Telescope Sydney Parks 64m Telescope
12 A brief History of VLBI development in NICT From K3-system to K5-system K4 Correlator K5 Data Acquisition Terminal K3 Correlator (Center) K3 Recorder (Right) K3 System 1983~ Longitudinal Recorder Open Reel Tapes Hardware Correlator K4 Terminal K4 (KSP) System 1990~ Rotary Head Recorder Cassette Tapes Hardware Correlator e-vlbi with ATM(256M) K5 System 2002~ PC based system Hard Disks Software Correlator e-vlbi with IP
13 K5-System : K5/VSSP K5/VSSP K5/VSSP32 Sampling Speed 40, 100, 200, 500kHz, 1, 2, 4, 8, 16 MHz Sampling Bits 1, 2, 4, 8 1, 2, 4, 8 40, 100, 200, 500kHz, 1, 2, 4, 8, 16, 32, 64MHz, No. Channels 1 or 4 (16 with 4 PCs) 1 or 4 (16 with 4 PCs) Max. Data Rate 128 Mbps (512 Mbps with 4 PCs) 256 Mbps (1024Mbps with 4PCs) Interface PCI (Full Height) USB2.0 VSSP = Versatile Scientific Sampling Processor K5/VSSP K5/VSSP32
14 K5 System : K5/VSI ADS1000 ADS2000 ADS3000 ADS3000Plus Sampling Speed 1024Msps 64Msps 2048Msps Gbps Sampling Bits 1 bit or 2 bits 1 bit or 2 bits 8 bits 2/4/8 bit No. of Input No. Channels 1 16 Programmable Programmable Max. Data Rate 2048Mbps 2048Mbps 4096Mbps 8192Mbps Interface VSI-H (2 ports) VSI-H (2 ports) VSI-H (2 ports) VSI-H (4 ports) ADS1000 ADS2000 ADS3000 ADS3000Plus
15 K5 System ADS3000 (2048Msample/sec 1ch 8bits + FPGA) ADS1000 (1024Msample/sec 1ch 1 or 2bits) VSI-H PC-VSI Board (~2048Mbps) VSI-H Correlator other DAS VSI-H Internet ADS2000 (64Msample/ch sec, 16ch, 1 or 2bits) Mark5B sampler (64Msample/ch sec, 16ch, 1 or 2bits) VSI-H K5/VSSP32 Unit (~32Msample/ch sec, ~4ch, ~8bits) PC : Data Acquisition Correlation
16 K5/VSI DBBC AD ADS3000 4Gbps (2GHz, 2sps)
17 ADS3000 plus under development Mode Dual Channel sampler For S/X observation DBBC Function VSI-H Compliant Sampling Mode Total Rate/ch Sample (Msps) Quanti zation A 1Gbps 128 8bit 32 B 2Gbps bit 32 C 2Gbps 512 4bit 32 D 4Gbps bit 64 E 4Gbps bit 64 Clock F 4Gbps 512 8bit 64 (MHz)
18
19 Summary VSI-H was quite successful, and useful. Mark5B-K5 JGN2Symp2007 UT1 NICT-NAOJ Devices(ADS-X000,VOA100/200,Software Corr(VERA) Sharing standard interface reduces the cost and brings freedom and benefit for VLBIers. E-VLBI era is good chance to make all VLBI system fully compatible/connectable. Handling data via software/network is great advantage. We may discuss about standard or framework for taking compatibility. Defining Standard Data Transport protocol Sharing interface software developed by each institutes.
20 Thank you for attention!
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