KVN

Duk-Gyoo Roh,and staffs of KASI & NAOJ + Kagoshima Univ.

8th VERA User’s Meeting, 2010. 09. 16-17. Mitaka NAOJ

Contents
EAVN & KJJVC project
KJJVC framework and status
 Playback Systems
 RVDB System
 VLBI Correlation Subsystem
 Peta-scale Epoch Data Archive Control & Operation Software Some Results from Test Operations

KJCC: Future Works and Operation
Plan

VLBI facilities in East Asia

Roadmap of “VLBI at East Asia”
VSOP-2

VERA

KVN

KJJVN
EAVN,
VSOP2

KJJVC

CJK Cooperationin VLBI

Korea-Japan Joint VLBI Correlator
Backgrounds

 At the beginning of 21C, two correlator plans arethere.
- KVN needs its own High-speed Correlator- Japan needs Next Generation Correlator
 To establish the bigger, more powerful correlator andget the best performance in East Asian VLBI Network,
we concluded that KASI & NAOJ join together todevelop new Correlator. (~2004)
 MOU between KASI & NAOJ (2005. 7. 7.)
 Sharing the vision, Collaborating together
 Development of Korea-Japan Joint VLBI Correlator,
 Common facility of correlation & data center Joint Development Project was initiated respectively.
Japan : 5 years from April 2005
Korea : 5 years from Jan. 2006

Design Target of KJJVC
2004. 12.

Development of KJJVCRequirements

 Data Rate : Max 8Gbps/station
8Gbps - 512MHz BW x 4 streams @ 2bits/sample
1Gbps - 16MHz BW x 16 streams @ 2bits/sample
1Gbps - 256MHz BW x 2 streams @ 1bits/sample
 # of stations : Max 16
 Freq. Resolution : <0.05 km/s ＠22GHz
 Field of View : >1 arcmin
Min. Integ. Time : <25 msec
 For Space VLBI, Max. Delay : 36,000 km
 Various Playbacks : Mark5B, DIR2000, K5/VSI,Optical Fiber(e-VLBI)Development of KJJVCSpecifications# of Antennas

16# of Inputs / Antenna

4 VSI ports (Narrow, Composite, Wide)

Max. # of Correlations / Stream

120 Cross + 16 Auto

Subarray Operation

3 cases (16, 12 + 4, 8 + 8)

Bandwidth for each Input

512 MHz

Digitization for each Input

1 Gsps by 2bits/sample

Data Rates per antenna

2 Gbps VSI-H (32 parallels, 64 MHz clock)Max. Delay compensation±36,000 km

Max. Fringe Tracking

1,075 kHzArchitecture

FX type, with FPGA and DSP chips

Word length in FFT

16+16 bits fixed point for real & imag.

Integration

25.6 msec ~ 10.24 sec

Data compression (Flexible Binning)

8,192 channels

Development of KJJVCOrganization

Review Committee
Working Groups

KJJVC Framework

Mark5B

VERA2000

Raw
VLBI
Data
BufferK-5

VLBI
Correlation
Subsystem

Optical Fiber

Correlator Control & Operation S/WPeta-scale
Epoch
Data
ArchivePlayback Systems
 Mark5B for KVN, CVN(?), VSOP-2
 VERA2000 for VERA Playback only version of VERA 2000
 K5-VSI for JVN (Yamaguchi, …)
 Optical Fiber for some on-line sites (upto 8 Gbps fornear future) OCTAVIA modified RVDB currently 4Gbps, but8Gbps coming soon.
 High speed Recorderas an upgrade ofVERA2000, Mark5B
 and also thereplacement of RVDB
and VERA2000/Mark5B
at KJCC

Raw VLBI Data Buffer(N. Kawaguchi / NAOJ)

 Purpose : Data format adjustment : # of bits per sample, and soon
 Easy synchronization while playback (heterogeneousrecorder models) Buffering between recorder speed(1 Gbps) andcorrelation speed(8 Gbps)
 Handy switching over to next session

Raw VLBI Data Bufferbasic configurationVLBI Correlation Subsystem (VCS)(2007.8-2009.7)•16 Stations, 2Gbps x 4 substreams/station•Correlation : (120 Cross + 16Auto) x 4 sub-stream•Serialized data sub-streams intime domain, and Parallel
processing in frequency
channels after FFT.
for Antenna #1•Full polarization observation
supported (up to 8 stations)

Data
AcceptDelayControl

Patch Pannel
256k
FFT

Corrleration Block #1
136 Corr.
Arry

10GbE
SWHUB
x4

OutputI/F

for Antenna #2

Corrleration Block #2

for Antenna #16

Corrleration Block #32•Two sub-array modes
prepared (12+4 and 8+8).
•Max. data output rate of
1.4GB/sec

2Gb/s x 16
x 16

VSI-H

1Gb/s x 16x 32

Optical transmission
4Gsample/sec

GbEther

10GbEther

VCS Factory Test(2009.6.)

PEDA(Peta-scale Epoch Data Archive) Max. data rate of 1.4GB/sec(~10% at average operation)
 PEDA (specification)
 Architecture• Infiniband

 Max. Capacity• 1~3 PB for 1 year (EAVN, VSOP-2)• 500 TB at initial phase (KVN, KJJVN) CODA File System
 Revision of Mitaka Correlator FS withsome modification (c++)CCoda2.1~100 TB

Control & Operation SW
 Playback(VERA2000, including Mk5B GUI) andRVDB control SW development was developed by
NAOJ, and are now modifying to adopt newfunctions.
 We developed the prototype control & operation
SW for final factory test of VCS August 2009.
 The GUI control & operation SW development
was completed the end of March, 2010.
 The Post-Correlation Post Processing SW
development are now underway in close
cooperation with Japanese colleagues.
 CODA file system by NAOJ
 Global Fringe Search SW by Kagoshima Univ.

RVDB control SW

Sub controlMain control

Mark5B-RVDB GUI interface

Correlation Control SW(CCS) GUI

CODA Software Tool – Post Correlation

Global Fringe Search SW
Kagoshima Univ.
Test with the CODA file system at2010. 9.

VCS field test (2009.8)

KJJVC integration test (2009.10)

Some Experimental Results
Observation data Spectral Line
• W49N (KVN) Continuum• NRAO150 (KVN)

Auto-Correlation Example

NRAO150
EXP = r09289a
ANT = KVNYS
FRQ = 22.227GHz USB
BW = 16MHz
INT = 1024msec

W49N
EXP = r09289a
ANT = KVNUS
FRQ = 22.227GHz USB
BW = 16MHz
INT = 1024msec

Cross-Correlation Example

W49N
EXP = r09289a
BAS = KVNYS-KVNUS
FRQ = 22.227GHz USB
BW = 16MHz
INT = 1024msec

From the First step to the Last one step

200620072008

Mark5B (4sets)
RVDB #1

2009

2010

Integration

Correlation
CenterOPEN

RVDB #2, #3, #4

2011

VERA2K #1 VERA2K #2
VLBI Correlation Subsystem
A.S .v1

Exp.

Software Developments

Debug …
Normal Op.

KJCC opened at 13 May 2010

Future Works
 Test the Post-Correlation Software Tools (2010 Sep)
 MoA for joint operation of KJCC between KASI andNAOJ (2010 Dec)
 Start the normal operation of KJCC (2011 Jan) Expand the capacity of Data Archive system, Update
Software for further activity (VSOP-2, Dual-Pol
Observation etc) (2011~)
 Prepare a well tuned-up pipeline processing, and an
Interface to VEDA (2011~2012) Move to Daejeon for New correlation center (~2012) Install the Data Archive Back-up system (2012~)
 Fill up the remainder RVDB or OCTAVIA for full 8Gbps
system (2012~)
 Ensure the wideband network for e-VLBI capability(2012~)

Plan of Full Operation

EAVN

KJCC 6,000 H/Y
Mitaka 2,500 H/Y2,000 H/Y
1,000

VSOP-21,000

KVN
5,000 H/Y

2,500

Geodesy
1,000

1,500
2,500

VERA
5,000 H/Y