The GGOS Bureau of Networks and Observationsªªª

Advocate for implementation of the global space geodesy network of sufficient capability and geographic coverage to achieve data products essential for GGOS
Serve as a coordinating point for the Services to meet, discuss status and plans, and examine common paths for meeting GGOS requirements
Director: Michael Pearlman/CfA, USA
http://176.28.21.212/en/bureaus/bno/

GGOS Bureau of Networks and Observations: Overview

Roles and Tasks of the Bureau••••••The GGOS Bureau of Networks and Observations (BNO) works with the IAG and its Services todevelop a strategy to design, integrate and maintain the fundamental infrastructure in asustainable way to satisfy the long-term (10 - 20 years) GGOS requirements.
The effort is to exploit synergistic opportunities to better integrate or co-locate with theinfrastructure and communications networks of the many other Earth Observation disciplines
organized under GEOSS.
The Bureau is constituted mainly from the Geometric Services (IGS, IVS, ILRS, IDS) to support
the maintenance and improvement of the reference frame, but efforts are now underway tointegrate other services and techniques that would enhance geodetic products of interest toGGOS.
The geodetic network of core and co-location sites will evolve as deployment and upgrade ofstations occurs over many years.
The utility of the network output will be the product of network configuration, mix oftechnologies, adherence to proper operational and engineering procedures, and our making
best use of the space geodesy data.

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Advocate for the implementation of the global space geodesy infrastructure of sufficientcapability and geographic coverage to achieve data products essential for GGOS, with highpriority on the reference frame.
Serve as a coordinating point for the IAG Services, for discussion of status and plans, andcommon paths for meeting GGOS requirements.
Encourage partnerships to implement core and co-locations sites.
Monitor and project the status and evolution of the GGOS space geodesy network in terms oflocation and performance (with the IAG services).
Provide simulations and analyses to estimate the improvement in data product quality over timeas the infrastructure improves.
Adopt and implement GGOS metadata system for data products and infrastructure.
Maintain and update the “Site Requirements for GGOS Core Sites” document (with the IAGServices).
Continue the Bureau’s “Call for Participation in the Global Geodetic Core Network: Foundation
for Monitoring the Earth System” and work with new potential groups interested in participating.

Global Networks Supporting GGOS

IGS (GNSS)

Organization of the Bureau

ILRS (SLR)

IVS (VLBI)IDS (DORIS)GGOS Bureau of Networks and Observations

Participants:• IAG Service Representatives• Bureau Leadership:• Standing Committee on Satellite Missions+ Director (Michael Pearlman/CfA, USA)
• Standing Committee on Data and InformationSystems+ Secretary (Carey Noll/NASA GSFC, USA)+ Analysis Coordinator (Erricos Pavlis/JCET • Standing Committee on Performance Simulations
and Architectural Trade-Offs (PLATO)
UMBC, USA)+ IERS Representative (Sten Bergstrand/SP, • IERS Working Group on Site Survey andCo-locationSweden)• IAG Service Representatives:+ IGS (Ruth Neilan, Steve Fisher/JPL, USA)
+ IVS (Hayo Hase/BKG, Germany; Chopo Ma/NASA GSFC, USA)
+ ILRS (Giuseppe Bianco/ASI, Italy; Zhang Zhongping/Shanghai Obs., China)+ IDS (Jérôme Saunier/IGN, France; Pascale Ferrage/CNES, France)+ IGFS (Riccardo Barzaghi/PM, Italy, George Vergos/UT, Greece)+ PSMSL (Lesley Rickards/BODC, UK; Tilo Schoene/GFZ, Germany)• Standing Committees:+ PLATO: Performance Simulations and Architectural Trade ‐ Offs (Daniela Thaller/BKG,Germany; Benjamin Maennel/GFZ, Germany)+ Data and Information Systems (Guenter Stangl/OEAW, Austria; Carey Noll/NASA GSFC,USA)+ Missions (Juergen Mueller/U. Hannover, Germany; Roland Pail/TUM, Germany)+ IERS WG on Site Survey and Co-location (Sten Bergstrand/SP, Sweden; John Dawson/GAAustralia)

TIGA tide gauge

Absolute gravimeter

Superconducting gravimeter

Early simulation studies showed a requirement for:•~32 globally distributed, well positioned, new technology, co-location sites will be required
to define and maintain the referenceframe• ~16 of these co-location
stations
must track GNSS satellites
with SLR to calibrate theGNSS orbits which areused to distribute thereference frame• Will require time,
significant resources, andstrong international
participation• Future network will be aConceptual distribution for a global
combination of core and co-location
space geodesy networksites with ample geographic distribution

Global Geodetic Observing System (GGOS)

GGOS Requirements
forCore Sites(Revision 2)

Recent Presentations and Publications•••••••M. Pearlman, C. Ma, C. Noll, E. Pavlis, H. Schuh, T. Schoene, R. Barzaghi, S. Kenyon, “TheGGOS Bureau of Networks and Observations and an Update on the Space GeodesyNetworks”, Abstract EGU2015-7420, presented at EGU 2015 General Assembly, April 13-17,
2015, Vienna, Austria, April 12-17, 2015.
M. Pearlman, E. Pavlis, C. Ma, C. Noll, D. Thaller, B. Richter, R. Gross, R. Neilan, J. Mueller, R.
Barzaghi, S. Bergstrand, J. Saunier, M. Tamisiea, “Update on the Activities of the GGOS Bureauof Networks and Observations”, Abstract No. 10095. Presented at European Geosciences
Union General Assembly, April 17-22, 2016.
C. Noll, “GGOS: Global Geodetic Observing System”, presented at 2016 WDS Members'Forum, Denver, Colorado, September 11, 2016.
G. Stangl, C. Noll, “GGOS: The Global Geodetic Observing System” (poster), presented at2016 WDS Members' Forum, Denver, Colorado, September 11, 2016.
M. Pearlman, C. Noll, C. Ma, E. Pavlis, R. Neilan, J. Saunier, T. Schoene, R. Barzaghi, D. Thaller,
S. Bergstrand, J. Mueller, “The GGOS Bureau of Networks & Observations: An Update on theSpace Geodesy Network & the New Implementation Plan for 2017- 2018”, Abstract No.
EGU2017-10698, presented at European Geosciences Union General Assembly 2017, Vienna,Austria, April 24-28, 2017.
M. Pearlman, H. Schuh, D. Angermann, C. Noll, “The Global Geodetic Observing System(GGOS) – Its Role and Its Activities”. JpGU-AGU Joint Meeting, Chiba, Japan, May 22- 26,
2017.
M. Pearlman, C. Ma, R. Neilan, C. Noll, E. Pavlis, J. Saunier, T. Shoene, R. Barzaghi, D. Thaller, S.
Bergstrand, J. Mueller, “The GGOS Bureau of Networks and Observations: Activities andPlans”. Presented at IAG-IASPEI, Kobe, Japan, July 30-August 04, 2017.

November 1, 2015
Contributors:
Graham Appleby
Dirk Behrend
Sten Bergstrand
Howard Donovan
Curtis Emerson
Jaime Esper
Hayo Hase
Jim Long
Chopo MaDavid McCormick
Carey Noll
Erricos Pavlis
Pascale Ferrage
Michael Pearlman (Lead)
Jerome SaunierDavid Stowers
Scott Wetzel

NERCNASA GSFC
SPHTSI
NASA GSFC
NASA/GSFC
AGGO BKG
NASA GSFC
NASA GSFC
NASA GSFC
NASA GSFC
UMBC
CNES
CfA
IGN
JPL
HTSI

GGOS Requirements for Core Sites

Revision 2

Network projection model for the next 5 and 10 years

GGOS:
IGS:
IVS:
ILRS:
IDS:
IGFS:

http://www.ggos.org
http://www.igs.org
https://ivscc.gsfc.nasa.gov
https://ilrs.gsfc.nasa.gov
http://www.ids-doris.org
http://www.ggos-portal.org/lang_en/
GGOS-Portal/EN/Topics/Services/
IGFS/IGFS.html
PSMSL: http://www.psmsl.org