Developments for real-time software correlation e-VLBI Y. Koyama, T. Kondo, M. Kimura, M. Sekido, M. Hirabaru, and M. Harai Kashima Space Research Center,

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Developments for real-time software correlation e-VLBI Y. Koyama, T. Kondo, M. Kimura, M. Sekido, M. Hirabaru, and M. Harai Kashima Space Research Center, NICT, Japan

e-VLBI in the beginning Key Stone Project ( ) Koganei Miura Tateyama 100km Kashima ATM Data Transfer Unit Realtime Collelator OC48(ATM) Realtime e-VLBI at 256Mbps (1998~) Automated Observations & Processing

VLBI Systems : From K3 to K5 K3 System K4 System 1983~ Longitudinal Recorder Open Reel Tapes Hardware Correlator 1990~ Rotary Head Recorder Cassette Tapes Hardware Correlator e-VLBI with ATM K3 Correlator (Center) K3 Recorder (Right) K4 Terminal K4 Correlator K5 System K5 Data Acquisition Terminal 2000~ PC based system Hard Disks Software Correlator e-VLBI with IP

Reports from NICT (1/3) Developments of K5/VSSP32 system –Supports 1024Mbps Observations Mode –4 Systems have been deployed 1 at Tsukuba and 3 at Kashima –currently causes spontaneous data error (once every ~150 seconds) need to develop a way to flag bad data in the K5 to Mark5 file format conversion K5/VSSP32 Unit (~32Msample/ch·sec, ~4ch, ~8bits)

Concept of the K5 System K3K4K5 Data RecordersMagnetic Tapes Longitudinal Recorders Magnetic Tapes Rotary Head Recorders Hard Disks e-VLBITelephone LineATMIP CorrelatorsHardware Software 1983~1990~2002~ M96 Recorder, K3 Formatter, K3 VC, K3 Correlator DIR-1000, -L -M, DFC1100, DFC2100, K4 VC (Type-1, 2), TDS784, ADS1000, GBR1000, GBR2000D, K4 Correlator, KSP Correlators, GICO, GICO2 IP-VLBI (K5/VSSP, K5/VSSP32), PC-VSI (K5/VSI), ADS1000, ADS2000, ADS3000

Global e-VLBI in Practice Rapid UT1 Estimation – – Kashima 34mWestford 18m Baseline Length ： 9502km Estimated UT1 (variation of the Earth’s rotation) in 4.5 hours. Software Correlation (20 CPUs). Observed data were recorded on hard disks and then transferred. K5 system was used at Kashima and Mark5 system was used at Westford. It has become routine operation for IVS (International VLBI Service) sessions.

Distributed Software Correlation Correlation Master Table / Database SQLSQL Client PCs Linux/FreeBSD Clients Server Master Server

JGNII Symposium 2005 in Osaka Osaka, Japan Run a program at Kashima and Haystack to generate fake data Data were transferred to Osaka in real-time (~400Mbps) and the data were processed for cross correlation processing with distributed software correlator program MIT Haystack NICT Kashima Abilene (10G) JGN II Int’l (10G) Tokyo JGN II (1G/10G) 1G/2.5G JGN II (10G) Osaka Venue 10G #1 #2 #3 #4 GEN-AGEN-B A B AB TT SX T x4 Raid Fiber Channel LCD NE (Network Emulator) NE T x4 SX x2 Fiber Channel TT LCD Measure-BMeasure-A

Another recent event at Kashima Emperor and Empress of Japan visited Kashima and they learned about e-VLBI (June 5, 2005) Demonstration software was developed. The software was designed to be useful for actual operation, too.

Developments of Software Correlator for VERA # Stations5 AlgorismFX Speed0.5~1.0 x 1Gbps x 5 stations OutputFITS, CODA Modes1024Msps x 2bits x 1ch 256Msps x 2bits x 2ch 32Msps x 2bits x 16ch Freq. 32/256/512/1024Msps PP1 sec ~ 0.01 sec Size19 inch rack x 20U Cost~20MYen (180K$) Mitaka FX Correlator

Data Transfer Test at FX Correlator (Mitaka, NAO) VSI

Remaining Challenges Real-time inter-operability between different systems (K5, Mark5, EVN System, etc.). Efficient distributed processing (GRID). Large scale (~40 stations) e-VLBI for VLBI2010. Higher speed for better sensitivity.

K5-Mark5 real-time correlation (near future plan) VSI-E Software Correlator vtp (receiver) vtp (sender) Mark5 System ADS2000 K5 System