1. Shanghai VLBI Center Activities
Zhong CHEN
On behalf of VLBI Center team
Shanghai Astronomy Observatory, CAS
IVTW2018 • Krabi, Thailand • 12-15, Nov. 2018

2. Outline Overview of CVN VLBI Center Activities 3. Future Works
CLEP Projects
Correlator and e-VLBI Operations
3. Future Works

3. CVN VLBI Network Stations VLBI Data Center
Sh – Shanghai Sheshan, 25m, 1987
Ur – Xinjiang Urumuqi, 25m, 1993  26m, 2016
Bj – Beijing Miyun, 50m, 2006
Km – Yunnan Kunming, 40m, 2006
T6 – Shanghai Tianma, 65m, 2013
VGOS – Shanghai Tianma Park, 13.2m, 2018
VLBI Data Center
VLBI tracking system for China’s Lunar Exploration Project (CLEP)
Since 2007 (Xuhui HQ), (Sheshan Park)
IVS Correlator, 2012 3

4. CVN L, S/X, C(6cm), K QTT S/X VGOS Sh FAST L, S/X, C(6cm) S/X, C T6
Data Center
L, S/X, C, X/Ka, K, Q

5. CVN Live Cam Ur, XAO Bj, NAOC Sh, SHAO VLBI C&C Hall T6, SHAO
VGOS, SHAO
Km, NAOC

6. VLBI for Deep Space missons
VLBI Tracking and Measurement System for CLEP
Phase I: CE-1 y2007
Phase II: CE-2 y2010 , CE-3 y2013
Phase III: CE-5T1 y2015, CE-5 y2019
Phase IV: CE-4 & DRS y2018 , CE-7, CE-6, CE-8
Mars exploration
Orbiter, Lander, Rover
Asteroid exploration
Need New Antennas 6

7. ChangE Probe Flight Orbit
CE-1
CE-3
Tuttis asteroid
CE-2
CE-5T1

8. CE-4 DRS & Probe
CE-4 Data Relay Satellite

9. CE-4 DRS Tracking Periods Critical, Important, Long-Term-Operation
e-VLBI, Auto e-Transfer
s8601a
s8706a
s8602a
s8706b
s8603a
s8707a
s8521a
s8604a
s8710a
s8806a
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s8605a
s8711a
s8807a
s8523a
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s8712a
s8809a
s8a04a
s8524a
s8607a
s8712b
s8811a
s8a06a
s8525a
s8608a
s8718a
s8813a
s8a15a
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s8609a
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s8a17a
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s8611a
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s8723b
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s8a18a
s8529a
s8612a
s8621a
s8723c
s8824a
s8914a
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s8530a
s8613a
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s8729a
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s8626a
s8730a
s8829a
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s8a22a
May
June
July
Aug.
Sep.
Oct.
Solar array panel, antenna, deploying
Mid-course corrections engine  ignition
Halo Orbit

10. VLBI Center for CLEP Command & Control Center
Real-time Tracking & Data Transfer & Processing

11. Dedicated Network and e-VLBI

12. CLEP VLBI Accuracy CE-3 X band DOR Signal
Earth-Moon transfer orbit phase & Circumlunar segment
ΔDOR tracking group delay < 4ns (Actuality <0.5ns)
100×100km circumlunar orbit accuracy: 20m
100×15km circumlunar orbit :30m
Descent trajectory: < 100m
Lunar surface working phase
Lander & Rover tracking by SBI
Lander 3D position <1km (Actuality <100m )
Rover relative position of the lander <500m (Actuality ~1m )
CE-4 DRS
S band, orbit accuracy: ~1km

13. Correlator Cluster Total: 70TFlops, 3.2PB
2 Active/Standby Management nodes
8 GPFS Storage Nodes
48 Correlator Nodes + 7 Fringe Searching GPU Nodes
20 Old Nodes for Dev and Testing
2 Archive Data Nodes

14. IVS and VGOS correlator
IVS Correlator
DiFX 2.5
400 CPU Cores(E5-2660)
437TB Storage, BeeGFS
Shared:1GbE, 56Gb IB Network
CVN SCorr
128 Cores (X5550)
182TB Storage
Intl. e-Transfer server: 2 Rack Servers
Mark5 Upgraded to 64bit
Sh, T6, Ur, Km
Center: 2 Mark5A, 4 Mark5B/B+
CScorr Upgraded
8 Compute Servers
Gold 6132, 2.60GHz, 96GB DDR4 Mem
1 Storage Server: 720TB, 90 disk/chassis
DiFX
CScorr
New Servers
New Storage

15. Observations Sessions IVS: routinely CE-4 DRS EVN: Ef+T6 VLBA CVN AOV
CVN+Quasar
EAVN
CE-4 DRS
CE-4
The goal of the VEPS1 program is to find all compact sources within 7.5° of the ecliptic plane that are suitable as calibrators for anticipated phase referencing observations of spacecraft, and determine their positions with accuracy at the 1.5nrad level.
Ecliptic Plane Survey: VEPS-1
Prof. Shu Fengchun

16. Internet e-VLBI
Connected and supported by CSTNET(Chinese Science & Technology Network, CAS)

17. e-VLBI Connected Stations e-Transfers SHAO’s Tianma & Seshan
VLBI Center
IVS stations and correlators
e-Transfers
IVS
EVN e-VLBI
EAVN
Pre-SKA Researches
2nd Australia-China SKA Big Data WS, May, 2018
NGAS Data Transfer
Multiple TCP streams

18. CLEP VLBI Database
Supported by Fundamental Science Data Sharing Platform, MOST
Dataset
CLEP VLBI tracking data: CE-1, CE-2, CE-3, CE-5T1
Will add following missions datasets
Online Search, offline download
EN version still under develping
Ministry of Science and Technology

19. Future Works Shanghai VLBI center Built for CLEP missions
Long-term deep spaces missions
More sessions work of Geodetic, Astrometry, Astrophysics
Preparatory works for VGOS

20. Our Team

21. Thanks！