IVS Report 2016/17. Dirk Behrend & Chopo Ma. GGOS Bureau of N&O, Vienna, Austria April 26, 2017

Transcription

1 IVS Report 2016/17 Dirk Behrend & Chopo Ma GGOS Bureau of N&O, Vienna, Austria April 26, 2017

2 Directing Board Lead: Chair: Axel Nothnagel, Univ Bonn [1 st term ends in May 17] Director CC: Dirk Behrend, NVI, Inc./NASA GSFC Directing Board Election results (6 of 16 seats): Elected Representatives: Francisco Colomer (Networks), Axel Nothnagel (Analysis), and Thomas Hobiger (Technology Development) Elected At-Large Members: Evgeny Nosov (IAA, Russia), Takahiro Wakasugi (GSI, Japan), and Guangli Wang (SHAO, China) Directing Board meetings: Last meeting: Westford, MA, USA on 15 October 16 Next meeting: Gothenburg, Sweden on 19 May 17

3 VLBI Observations of Near-Field Targets Workshop in Bonn, Germany on October 5 6, 2016 About 50 participants, 25 presentations; WG7 splinter meeting Talks: Topics: Near-field delay model, APOD (CubSat w/ VLBI transmitter), Chang E-3 lander (VLBI transmitter on moon), GNSS observations

4 5 th Int l VLBI Technology Workshop Workshop at MIT Haystack Observatory, October 12 14, 2016 Geodetic/Astrometric (IVS) and Astronomy communities, annual WS About 70 participants from around the world Topics: Simplification of signal-chain; direct-rf-sampling New-generation of high-performance frequency standards Towards commodity computing for tasks now done with FPGAs Tbps-scale data recording/transmission Tbps-scale correlation and scaling to many stations VLBI from space (including space-to-space baselines) TeraHz VLBI - what are the limits? Presentations: presentations_2016.htm

5 9 th Technical Operations Workshop Workshop at MIT Haystack Observatory, April 30 May 4, 2017 Hands-on training of technical station staff 62 registered participants from 17 countries TOW organized every two years Challenge of having both legacy and VGOS broadband systems covered

6 Dismantling of Tsukuba Tsukuba 32-m antenna dismantled in February/March 2017 Functionality replaced by Ishioka 13.2-m antenna

7 Projected VGOS Network by 2020

8 VGOS Roll-out Progress (1/2) Station Recent milestone VGOS broadband GGAO Regular VGOS tests ready Westford Regular VGOS tests ready Wettzell South Regular VGOS tests ready Yebes Regular VGOS tests ready Ishioka Regular S/X observing ready (but is S/X now) Kokee Park Regular VGOS tests ready AuScope (Hobart) Upgrade hardware ordered mid-2017 AuScope (Yg, Ke) Upgrade hardware ordered end-2017 Onsala Inauguration in May 2017 mid-2017 Santa Maria Tri-band receiver installed late 2017 Badary Fixed broadband system 2017 (S/X/Ka) Zelenchukskaya Fixed broadband system 2017 (S/X/Ka)

9 VGOS Roll-out Progress (2/2) Station Recent milestone VGOS broadband Sheshan Foundation work completed 2018 Tenerife RT assembled at factory 2018 Ny Ålesund Antennas erected at site 2018 HartRAO Concrete tower completed 2018 McDonald Tender released 2019 Metsähovi Site preparation work started 2019 Svetloe Funding secured 2019 Flores Site selected 2020 Tahiti Site selected 2020

10 Onsala Twin Telescope (OTT) 25 m OTT2 OTT1 20 m Courtesy R. Haas

11 Ny-Ålesund Twin Telescope Courtesy Veidekke Arctic

12 Hartebeesthoek, South Africa Groundbreaking in March 2016 Concrete tower completed in February 2017

13 VGOS Tests Test sessions observed every 2 weeks 24-hour observing with 3 to 5 stations (3 North America, 2 Europe) correlation at Haystack Observatory equipment differences for the various stations Testing and improving of station operations and correlation Not full end-to-end (until geodetic results) tests

14 Diversity of VGOS Equipment Backends RDBE (Roach-based Digital Back End): joint effort between MIT Haystack Observatory and NRAO; two personalities (Polyphase Filter Bank, PFB; Direct Digital Converter, DDC); various flavors: RDBE, RDBE-G, R2DBE DBBC (Digital Base Band Converter): European effort by G. Tuccari; various flavors: DBBC, DBBC2, DBBC3 ADS300+: Japanese development, DDC-based CDAS (Chinese Data Acquisition System): developed at SHAO (X. Zhang), PFB and DDC versions BRAS (Russian Broadband Acquisition System): developed at IAA (E. Nosov) Feeds Eleven: developed at Chalmers University, available through Omnisys Instruments QRFH (Quadruple Ridged Flared Horn): developed at Caltech

15 Continuous VLBI Campaign CONT17 Legacy S/X network of 10 VLBA stations plus select geodetic IVS stations Legacy S/X network of geodetic IVS stations

16 CONT17: VGOS Demonstration Network Observing period: subset of 15-day period (from Nov 28 to Dec 12, 2017) VGOS broadband network of up to 8 VGOS stations

17 Thank you.