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

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

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), 2012 (Sheshan Park) IVS Correlator, 2012 3

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

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

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 2020-2023 Orbiter, Lander, Rover Asteroid exploration 2022-2032 Need New Antennas 6

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

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

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 s8522a s8605a s8711a s8807a s8523a s8606a s8712a s8809a s8a04a s8524a s8607a s8712b s8811a s8a06a s8525a s8608a s8718a s8813a s8a15a s8526a s8609a s8721a s8814a s8904a s8a16a s8527a s8610a s8723a s8818a s8905a s8a17a s8528a s8611a s8620a s8723b s8820a s8912a s8a18a s8529a s8612a s8621a s8723c s8824a s8914a s8a19a s8530a s8613a s8621b s8729a s8828a s8921a s8a21a s8531a s8614a s8626a s8730a s8829a s8925a s8a22a May June July Aug. Sep. Oct. Solar array panel, antenna, deploying Mid-course corrections engine  ignition Halo Orbit

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

Dedicated Network and e-VLBI

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

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

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

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

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

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

CLEP VLBI Database Supported by Fundamental Science Data Sharing Platform, MOST https://www.vlbi.nsdc.cn 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

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

Our Team

Thanks！