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<tt>Dear Colleagues,</tt><tt><br>
</tt><tt><br>
the terms of Jake Griffiths as the IGS Analysis Center Coordinator
ends at the end of 2015. In order to allow for a smooth transition
to a new ACC the IGS releases a Request for Proposals which you
find included in this mail as well as at the IGS main web page</tt><br>
<a class="moz-txt-link-freetext" href="http://igs.org">http://igs.org</a>
(in the Recent News section)
<br>
or<br>
<a class="moz-txt-link-freetext"
href="ftp://igs.org/pub/resource/pubs/IGS_RfP_nextACC_2013.pdf">ftp://igs.org/pub/resource/pubs/IGS_RfP_nextACC_2013.pdf</a>
<br>
<br>
Institutions are encouraged to consider supporting the IGS with this
very important function. We would be glad to receiver expressions of
interest until June 01, 2014. Do not hesitate to contact myself or
the current ACC for further information.<br>
<br>
Best regards<br>
Urs Hugentobler<br>
Chair, IGS Governing Board<br>
<br>
<br>
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<tt>
</tt>
<h1><tt><span style="font-size:16.0pt" lang="EN-US">Request for
Proposal for next Analysis
Center Coordinator<o:p></o:p></span></tt></h1>
<tt>
</tt>
<h1><tt><span style="font-weight:normal" lang="EN-US">2013-Nov-30<o:p></o:p></span></tt></h1>
<tt>
</tt>
<p class="MsoNormal"><tt><span lang="EN-US"><o:p> </o:p></span></tt></p>
<tt>
</tt>
<h1><tt><span lang="EN-US">Summary</span></tt></h1>
<tt>
</tt>
<p class="MsoNormal"><tt><span lang="EN-US">The IGS invites
proposals for a successor
to the current Analysis Center Coordinator, starting in 2016.
Here are the key
dates:</span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1
lfo4"><!--[if !supportLists]--><tt><span
style="font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol"
lang="EN-US"><span style="mso-list:Ignore">·<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><span
lang="EN-US">30 November
2013—this call for proposals</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1
lfo4"><!--[if !supportLists]--><tt><span
style="font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol"
lang="EN-US"><span style="mso-list:Ignore">·<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><span
lang="EN-US">01 June 2014—deadline
for submission of expression of interest for next ACC</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1
lfo4"><!--[if !supportLists]--><tt><span
style="font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol"
lang="EN-US"><span style="mso-list:Ignore">·<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><span
lang="EN-US">31 September 2014—deadline
for submission of response for next ACC</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1
lfo4"><!--[if !supportLists]--><tt><span
style="font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol"
lang="EN-US"><span style="mso-list:Ignore">·<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><span
lang="EN-US">31 December 2014—selection
of next ACC</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1
lfo4"><!--[if !supportLists]--><tt><span
style="font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol"
lang="EN-US"><span style="mso-list:Ignore">·<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><span
lang="EN-US">01 July 2015—beginning
of test and validation phase for new ACC</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1
lfo4"><!--[if !supportLists]--><tt><span
style="font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol"
lang="EN-US"><span style="mso-list:Ignore">·<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><span
lang="EN-US">01 January 2016—full
operational responsibility by new IGS ACC</span></span></tt></p>
<tt>
</tt>
<h1><tt><span lang="EN-US">Background</span></tt></h1>
<tt>
</tt>
<p class="MsoNormal"><tt><span lang="EN-US">The IGS Analysis Center
Coordinator (ACC)
has overall responsibility for generating the main official
IGS combined
products. During the period 2008 through 2015, the IGS ACC
functions are
performed by NOAA's National Geodetic Survey (NGS) in Silver
Spring, Maryland,
USA. Currently, there are three IGS product lines for GNSS
satellite orbits and
clocks, namely the Final (GPS and GLONASS independently), the
Rapid (GPS only),
and the Ultra-rapid (GPS and GLONASS independently) products.
During previous
periods, the ACC functions have been performed by the
Deutsches GeoForschnungsZentrum
(GFZ, Potsdam, Germany during 2003-2008), Center for Orbit
Determination in
Europe (CODE, Bern, Switzerland and Vienna, Austria during
1999-2003), and Natural
Resources Canada (NRCan, Ottawa, Canada during 1994-1998).</span></tt></p>
<tt>
</tt>
<p class="MsoNormal"><tt><span lang="EN-US">Certain IGS product
combination tasks are
shared with the ACC. For the Final products, those components
involving the
terrestrial reference frame, including the Earth rotation
parameters, are
produced by a combination of SINEX file submissions at
Institut National de
l'Information Géographique et Forestière<i
style="mso-bidi-font-style:normal"> </i>(IGN,
France). (This function was at NRCan in Ottawa prior to 2010.)
The internally
realized timescales of the IGS, formed by a weighted ensemble
of the frequency
standards available in the IGS clock products, are maintained
by the Naval
Research Laboratory (NRL, Washington, DC, USA). Such
high-stability timescales
are supported for the IGS Rapid and Final GPS products, but
not yet for GLONASS
or the Ultra-rapids.</span></tt></p>
<tt>
</tt>
<p class="MsoNormal"><tt><span lang="EN-US">Other IGS products are
formed by separate
working groups not directly linked to the ACC, such as
ionosphere maps,
tropospheric path delays, and real-time services.
Nevertheless, overall
consistency should be maintained across all IGS products.</span></tt></p>
<tt>
</tt>
<p class="MsoNormal"><tt><span lang="EN-US">The present ACC
combination system traces
back to the early 1990s with many diverse components, written
in a variety of
coding languages, and many modifications since that time to
accommodate changes.
While the previous call, which was posted in August 2009
(IGSMAIL-5984),
requested proposals for a next-generation combination system
(ACC2.0), none
were submitted. The legacy system continues to be used, but
any efforts by the
new ACC to incorporate newer GNSS constellations, new signals,
or otherwise
improve the existing combination system are encouraged. IGS is
aiming at fully
consistent Multi-GNSS products. The activities related to the
IGS Multi-GNSS Experiment
will eventually be fully integrated into the standard product
streams.</span></tt></p>
<tt>
</tt>
<p class="MsoNormal"><tt><span lang="EN-US">The term of the current
ACC will expire at
the end of 2015. A new ACC will be needed to replace Jake
Griffiths (NGS) starting
January 1, 2016, with a transition and validation phase
starting preferably no
less than six months earlier.</span></tt></p>
<tt>
</tt>
<p class="MsoNormal"><tt><span lang="EN-US">The ACC is a fundamental
task within the
IGS.</span></tt></p>
<tt>
</tt>
<p class="MsoNormal"><tt><span lang="EN-US">Expressions of interest
to succeed NGS
starting January 1, 2016 are requested at the earliest
opportunity, but no
later than 01 June 2014.</span></tt></p>
<tt>
</tt>
<p class="MsoNormal"><tt><span lang="EN-US">Selections for the next
ACC will be made by
31 December 2014, with a hand-over process beginning no later
than mid-2015.</span></tt></p>
<tt>
</tt>
<h1><tt><span lang="EN-US">Guiding Principles for ACC Combinations</span></tt></h1>
<tt>
</tt>
<p class="MsoNormal"><tt><span lang="EN-US">The following are the
historic principles
that have guided IGS analysis product combinations:</span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l3 level1
lfo1"><!--[if !supportLists]--><tt><span
style="mso-fareast-font-family:"Times New Roman""
lang="EN-US"><span style="mso-list:Ignore">1.<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><span
lang="EN-US">Software
independence—The IGS products should not favor any
particular AC software
design. In particular, least squares methods cannot have a
preference over filter
methods.</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l3 level1
lfo1"><!--[if !supportLists]--><tt><span
style="mso-fareast-font-family:"Times New Roman""
lang="EN-US"><span style="mso-list:Ignore">2.<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><span
lang="EN-US">Diversity of
approaches—Diverse modeling approaches are preferred as long
as they are
physically reasonable and compatible, and conform to
accepted conventions. Only
in this way can progress be achieved. Nevertheless, all AC
solutions must
attain comparable levels of accuracy in order for the
product combinations to
benefit.</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l3 level1
lfo1"><!--[if !supportLists]--><tt><span
style="mso-fareast-font-family:"Times New Roman""
lang="EN-US"><span style="mso-list:Ignore">3.<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><span
lang="EN-US">Objective
weighting—The combination strategy should use AC weights
that are objectively
based, usually on the basis of best agreement with the mean
or with some external
standard of sufficient accuracy.</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l3 level1
lfo1"><!--[if !supportLists]--><tt><span
style="mso-fareast-font-family:"Times New Roman""
lang="EN-US"><span style="mso-list:Ignore">4.<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><span
lang="EN-US">Unconstrained—AC
solutions should be either unconstrained or only minimally
constrained. Generally
the IGS should strive to move in the direction of
lesser/weaker solution
constraints, a goal that has been substantially advanced
during the present ACC
tenure.</span></span></tt></p>
<tt>
</tt>
<h1><tt><span lang="EN-US">Specific ACC Tasks</span></tt></h1>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l2 level1
lfo2"><!--[if !supportLists]--><tt><span
style="mso-fareast-font-family:"Times New Roman""
lang="EN-US"><span style="mso-list:Ignore">1.<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><b
style="mso-bidi-font-weight:
normal"><i style="mso-bidi-font-style:normal"><span
lang="EN-US">Working Groups
& Pilot Projects</span></i></b><span lang="EN-US">:
The ACC is an ex officio
member of all IGS working groups and pilot projects, and is
also a voting
member of the IGS Governing Board. Responsibilities
described in the IGS Terms
of Reference are given at igs.org/organization/bylaws.html.</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l2 level1
lfo2"><!--[if !supportLists]--><tt><span
style="mso-fareast-font-family:"Times New Roman""
lang="EN-US"><span style="mso-list:Ignore">2.<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><b
style="mso-bidi-font-weight:
normal"><i style="mso-bidi-font-style:normal"><span
lang="EN-US">Core products</span></i></b><span
lang="EN-US">: The ACC is responsible for forming and
distributing the IGS core
products, i.e.:</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level2
lfo2"><!--[if !supportLists]--><tt><span
style="mso-fareast-font-family:"Times New Roman""
lang="EN-US"><span style="mso-list:Ignore">a.<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><span
lang="EN-US">Ultra-rapid GPS &
GLONASS satellite orbits and clocks with ERPs, presently
issued four times
daily with an initial delay of 3 hr;</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level2
lfo2"><!--[if !supportLists]--><tt><span
style="mso-fareast-font-family:"Times New Roman""
lang="EN-US"><span style="mso-list:Ignore">b.<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><span
lang="EN-US">Rapid GPS
satellite orbits and clocks with ERPs and station clocks,
presently issued
daily with a delay of 17 hr;</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level2
lfo2"><!--[if !supportLists]--><tt><span
style="mso-fareast-font-family:"Times New Roman""
lang="EN-US"><span style="mso-list:Ignore">c.<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><span
lang="EN-US">Final GPS &
GLONASS satellite orbits and clocks with station clocks,
presently issued
weekly with a delay of about 12 days.</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal" style="margin-left:36.0pt"><tt><span
lang="EN-US">Expansion of
this product set to include new GNSS constellations or to
implement other
enhancements is encouraged, provided that the ACs and other
supporting
organizations approve and contribute.</span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l2 level1
lfo2"><!--[if !supportLists]--><tt><span
style="mso-fareast-font-family:"Times New Roman""
lang="EN-US"><span style="mso-list:Ignore">3.<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><b
style="mso-bidi-font-weight:
normal"><i style="mso-bidi-font-style:normal"><span
lang="EN-US">Reprocessed
products</span></i></b><span lang="EN-US">: From time to
time, the IGS expects to
reprocess all GNSS observational data using the latest
models and procedures to
achieve the highest possible product accuracy and to
maintain long-term
consistency.</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level2
lfo2"><!--[if !supportLists]--><tt><span
style="mso-fareast-font-family:"Times New Roman""
lang="EN-US"><span style="mso-list:Ignore">a.<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><span
lang="EN-US">Detailed
specifications and performance metrics for these products
are given at
acc.igs.org. In the future, new or expanded combination
products might be
indicated.</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l2 level1
lfo2"><!--[if !supportLists]--><tt><span
style="mso-fareast-font-family:"Times New Roman""
lang="EN-US"><span style="mso-list:Ignore">4.<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><b
style="mso-bidi-font-weight:
normal"><i style="mso-bidi-font-style:normal"><span
lang="EN-US">Coordinate with
TRF and clock products</span></i></b><span lang="EN-US">:
The formation of the
Rapid and Final clock time scales and the Final station
coordinate/ERP products
requires close interaction with the Coordinators for those
products. Electronic
exchanges of data files must be synchronized and monitored
in order to avoid
product interruptions.</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l2 level1
lfo2"><!--[if !supportLists]--><tt><span
style="mso-fareast-font-family:"Times New Roman""
lang="EN-US"><span style="mso-list:Ignore">5.<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><b
style="mso-bidi-font-weight:
normal"><i style="mso-bidi-font-style:normal"><span
lang="EN-US">Monitor AC
products</span></i></b><span lang="EN-US">: The ACs must
be promptly informed
whenever problems occur in the quality or availability of
their input solutions
and it is sometimes necessary to intervene in the
combination process to
minimize adverse impacts. Changes made by ACs often require
corresponding
changes in the ACC procedures.</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l2 level1
lfo2"><!--[if !supportLists]--><tt><span
style="mso-fareast-font-family:"Times New Roman""
lang="EN-US"><span style="mso-list:Ignore">6.<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><b
style="mso-bidi-font-weight:
normal"><i style="mso-bidi-font-style:normal"><span
lang="EN-US">Monitor ACC
products</span></i></b><span lang="EN-US">: The quality
and reliability of the
IGS official products must be continuously monitored for any
deficiencies,
which must be promptly addressed. Difficulties with the flow
of product files
to the IGS Data Centers must also be resolved as quickly as
possible.</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l2 level1
lfo2"><!--[if !supportLists]--><tt><span
style="mso-fareast-font-family:"Times New Roman""
lang="EN-US"><span style="mso-list:Ignore">7.<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><b
style="mso-bidi-font-weight:
normal"><i style="mso-bidi-font-style:normal"><span
lang="EN-US">Report station
data problems</span></i></b><span lang="EN-US">: Many
types of data anomalies at
the tracking stations can have adverse effects on the IGS
products. When these
are detected it is important to notify the station operators
promptly.</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l2 level1
lfo2"><!--[if !supportLists]--><tt><span
style="mso-fareast-font-family:"Times New Roman""
lang="EN-US"><span style="mso-list:Ignore">8.<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><b
style="mso-bidi-font-weight:
normal"><i style="mso-bidi-font-style:normal"><span
lang="EN-US">Maintain
external interactions and interfaces</span></i></b><span
lang="EN-US">: The ACC
procedures depend on data files from certain external
organizations which must
be continuously updated. Likewise, the ACC products flow
continuously to
various external users. These interfaces must be reliably
maintained and
updated as needed, which requires routine interactions with
such external
groups as the International Earth Rotation and Reference
Systems Service (IERS).
Also included in this activity is maintenance of the IERS
Conventions upon
which the IGS data reductions rely.</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l2 level1
lfo2"><!--[if !supportLists]--><tt><span
style="mso-fareast-font-family:"Times New Roman""
lang="EN-US"><span style="mso-list:Ignore">9.<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><b
style="mso-bidi-font-weight:
normal"><i style="mso-bidi-font-style:normal"><span
lang="EN-US">Research and
improvements</span></i></b><span lang="EN-US">: The ACC
should normally play an
active role, together with the ACs and other scientists, in
evaluating the
quality and comprehensiveness of present IGS products and
developing approaches
for their improvement.</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l2 level1
lfo2"><!--[if !supportLists]--><tt><span
style="mso-fareast-font-family:"Times New Roman""
lang="EN-US"><span style="mso-list:Ignore">10.<span
style="font:7.0pt "Times New Roman""> </span></span></span></tt><!--[endif]--><tt><span
dir="LTR"><b style="mso-bidi-font-weight:normal"><i
style="mso-bidi-font-style:
normal"><span lang="EN-US">IGS Workshops</span></i></b><span
lang="EN-US">: The ACC
ordinarily identifies key technical topics that should
impact the planning and
organization of IGS workshops.</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l2 level1
lfo2"><!--[if !supportLists]--><tt><span
style="mso-fareast-font-family:"Times New Roman""
lang="EN-US"><span style="mso-list:Ignore">11.<span
style="font:7.0pt "Times New Roman""> </span></span></span></tt><!--[endif]--><tt><span
dir="LTR"><b style="mso-bidi-font-weight:normal"><i
style="mso-bidi-font-style:
normal"><span lang="EN-US">Website</span></i></b><span
lang="EN-US">: The ACC
maintains a website of information concerning the IGS core
products, their
quality, and other information helpful to the ACs and
general users.</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l2 level1
lfo2"><!--[if !supportLists]--><tt><span
style="mso-fareast-font-family:"Times New Roman""
lang="EN-US"><span style="mso-list:Ignore">12.<span
style="font:7.0pt "Times New Roman""> </span></span></span></tt><!--[endif]--><tt><span
dir="LTR"><b style="mso-bidi-font-weight:normal"><i
style="mso-bidi-font-style:
normal"><span lang="EN-US">Outreach</span></i></b><span
lang="EN-US">: It is
necessary to provide users information about the combined
IGS products on a
regular basis, as needed.</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l2 level1
lfo2"><!--[if !supportLists]--><tt><span
style="mso-fareast-font-family:"Times New Roman""
lang="EN-US"><span style="mso-list:Ignore">13.<span
style="font:7.0pt "Times New Roman""> </span></span></span></tt><!--[endif]--><tt><span
dir="LTR"><b style="mso-bidi-font-weight:normal"><i
style="mso-bidi-font-style:
normal"><span lang="EN-US">Reports</span></i></b><span
lang="EN-US">: The results
of each ACC product combination are documented in regular
reports distributed
by the IGS. Other reports and scientific papers should be
prepared to document
future developments and accomplishments.</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"><tt><span lang="EN-US">It is expected that the
transition to the
next ACC will require a visit to NGS by personnel from the
successor host
organization.</span></tt></p>
<tt>
</tt>
<h1><tt><span lang="EN-US">Responses</span></tt></h1>
<tt>
</tt>
<p class="MsoNormal"><tt><span lang="EN-US">Expressions of interest
and proposals for
the successor to the current Analysis Center Coordinator
should be addressed to
the IGS Central Bureau (igscb at igscb.jpl.nasa.gov) with the
following
information:</span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l1 level1
lfo3"><!--[if !supportLists]--><tt><span
style="font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol"
lang="EN-US"><span style="mso-list:Ignore">·<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><span
lang="EN-US">names of key
personnel</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l1 level1
lfo3"><!--[if !supportLists]--><tt><span
style="font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol"
lang="EN-US"><span style="mso-list:Ignore">·<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><span
lang="EN-US">level of support
to be provided</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l1 level1
lfo3"><!--[if !supportLists]--><tt><span
style="font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol"
lang="EN-US"><span style="mso-list:Ignore">·<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><span
lang="EN-US">computing system
to be used for tasks and other technical information</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l1 level1
lfo3"><!--[if !supportLists]--><tt><span
style="font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol"
lang="EN-US"><span style="mso-list:Ignore">·<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><span
lang="EN-US">available
starting date</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l1 level1
lfo3"><!--[if !supportLists]--><tt><span
style="font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol"
lang="EN-US"><span style="mso-list:Ignore">·<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><span
lang="EN-US">duration of
commitment</span></span></tt></p>
<tt>
</tt>
<h1><tt><span lang="EN-US">Schedule</span></tt></h1>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1
lfo4"><!--[if !supportLists]--><tt><span
style="font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol"
lang="EN-US"><span style="mso-list:Ignore">·<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><span
lang="EN-US">30 November 2013—this
call for proposals</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1
lfo4"><!--[if !supportLists]--><tt><span
style="font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol"
lang="EN-US"><span style="mso-list:Ignore">·<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><span
lang="EN-US">01 June 2014—deadline
for submission of expression of interest for next ACC</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1
lfo4"><!--[if !supportLists]--><tt><span
style="font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol"
lang="EN-US"><span style="mso-list:Ignore">·<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><span
lang="EN-US">31 September 2014—deadline
for submission of response for next ACC</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1
lfo4"><!--[if !supportLists]--><tt><span
style="font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol"
lang="EN-US"><span style="mso-list:Ignore">·<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><span
lang="EN-US">31 December 2014—selection
of next ACC</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1
lfo4"><!--[if !supportLists]--><tt><span
style="font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol"
lang="EN-US"><span style="mso-list:Ignore">·<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><span
lang="EN-US">01 July 2015—beginning
of test and validation phase for new ACC</span></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"
style="margin-left:36.0pt;text-indent:-18.0pt;mso-list:l0 level1
lfo4"><!--[if !supportLists]--><tt><span
style="font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:Symbol"
lang="EN-US"><span style="mso-list:Ignore">·<span
style="font:7.0pt "Times New Roman"">
</span></span></span></tt><!--[endif]--><tt><span dir="LTR"><span
lang="EN-US">01 January 2016—full
operational responsibility by new IGS ACC</span></span></tt></p>
<tt>
</tt>
<h1><tt><span lang="EN-US">References</span></tt></h1>
<tt>
</tt>
<p class="MsoNormal"><tt><span lang="EN-US">G. Beutler, J. Kouba, T.
Springer (1995)
Combining the orbits of the IGS Analysis Centers, Bull. Geod.,
69, 200-222,
doi: 10.1007/BF00806733</span></tt></p>
<tt>
</tt>
<p class="MsoNormal"><tt><span lang="EN-US">J. Kouba, Y. Mireault,
F. Lahaye (1995)
Analysis Coordinator report, in International GPS Service for
Geodynamics 1994
Annual Report, Jet Propulsion Laboratory publication 95-18, pp
59-94, available
at: <a
href="http://igscb.jpl.nasa.gov/igscb/resource/pubs/94an_repta.pdf">http://igscb.jpl.nasa.gov/igscb/resource/pubs/94an_repta.pdf</a></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"><tt><span lang="EN-US">J. Kouba, J. Ray, M.M.
Watkins (1998) IGS
Reference Frame Realization, in 1998 IGS Analysis Center
Workshop Proceedings,
European Space Operations Centre, Darmstadt, Germany, pp
139-171, available at:
<a
href="http://igscb.jpl.nasa.gov/igscb/resource/pubs/wksp_2.pdf">http://igscb.jpl.nasa.gov/igscb/resource/pubs/wksp_2.pdf</a></span></tt></p>
<tt>
</tt>
<p class="MsoNormal"><tt><span lang="EN-US"><a
href="http://link.springer.com/search?facet-author=%22Jake+Griffiths%22"><span
style="color:windowtext;text-decoration:none;text-underline:none">J.
Griffiths</span></a>,
<a
href="http://link.springer.com/search?facet-author=%22Jim+R.+Ray%22"><span
style="color:windowtext;text-decoration:none;text-underline:none">J. Ray</span></a>
(2009) On the Precision and Accuracy of IGS Orbits, J. of
Geodesy, 83(3-4),
277-287, doi: 10.1007/s00190-008-0237-6</span></tt></p>
<tt>
</tt>
<p class="MsoNormal"><tt><span lang="EN-US"><a
href="http://link.springer.com/search?facet-author=%22Jake+Griffiths%22"><span
style="color:windowtext;text-decoration:none;text-underline:none">J.
Griffiths</span></a>,
<a
href="http://link.springer.com/search?facet-author=%22Jim+R.+Ray%22"><span
style="color:windowtext;text-decoration:none;text-underline:none">J. Ray</span></a>
(2013) Sub-daily Alias and Draconitic Errors in the IGS
Orbits, GPS Solutions,
17(3), 413-422, doi: 10.1007/s10291-012-0289-1</span></tt></p>
<tt>
</tt>
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