IVS Report 2016/17176.28.21.212 › media › filer_public › 73 › 9a › 739aa873-4e9b-4... ·...

Dirk Behrend & Chopo Ma, 26-April-2017

Dirk Behrend & Chopo Ma

IVS Report 2016/17

GGOS Bureau of N&O, Vienna, Austria

April 26, 2017


Directing Board

Lead:

• Chair: Axel Nothnagel, Univ Bonn [1st 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


VLBI Observations of Near-Field Targets

• Workshop in Bonn, Germany on October 5–6, 2016

• About 50 participants, 25 presentations; WG7 splinter meeting

• Talks: http://www3.mpifr-bonn.mpg.de/div/meetings/vonft/talks.html

• Topics: Near-field delay model, APOD (CubSat w/ VLBI transmitter),

Chang’E-3 lander (VLBI transmitter on moon), GNSS observations…


5th 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: http://www.haystack.mit.edu/workshop/ivtw2016/

presentations_2016.htm


9th 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

• http://www.haystack.mit.edu/workshop/TOW2017/Index.htm


Dismantling of Tsukuba

• Tsukuba 32-m antenna dismantled in February/March 2017

• Functionality replaced by Ishioka 13.2-m antenna


Projected VGOS Network by 2020


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)


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


Courtesy R. Haas

25 m

20 m OTT1 OTT2

Onsala Twin Telescope (OTT)


Courtesy Veidekke Arctic

Ny-Ålesund Twin Telescope


Hartebeesthoek, South Africa

Concrete tower completed in February 2017

Groundbreaking in March 2016


• 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

VGOS Tests


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


Continuous VLBI Campaign CONT17

Legacy S/X network of geodetic IVS stations

Legacy S/X network of 10 VLBA stations plus select geodetic IVS stations


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


Thank you.

IVS Report 2016/17176.28.21.212 › media › filer_public › 73 › 9a › 739aa873-4e9b-4... ·...

Documents

Transcript of IVS Report 2016/17176.28.21.212 › media › filer_public › 73 › 9a › 739aa873-4e9b-4... ·...