DETAILED PROGRAM
Summary of Recommendations
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Sunday,
1 June 2008
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12:00 - 18:00 | IGS Governing Board meeting (invitation only) — Fisher Room
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chair: J. Dow
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18:00 - 20:00 | Informal Gathering (cash bar) — Di Lido patio
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Monday,
2 June 2008
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08:00 - 08:40 | Registration |
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08:40 - 09:00 | Welcome remarks |
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G. Mader — Convenor & Chief, Geosciences Research Division,
NGS/NOS/NOAA
D. Zilkoski — Director, National Geodetic Survey, NOS/NOAA
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| 09:00 - 09:45 | Keynote address |
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Hon. Jeff Kottkamp — Lt. Governor of Florida
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| 09:45 - 10:00 | The International GNSS Service, June 2008: Perspectives & Key Issues |
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J. Dow — Chair, IGS Governing Board
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| 10:00 - 10:30 | coffee break |
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| 10:30 - 12:00 | Pending & proposed model changes |
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chairs: J. Ray, J. Böhm (not attending), M. Hernandez-Pajares, M. Ziebart
Improvements in the analysis strategies and modeling of the IGS Analysis
Centers are an ongoing process. This session will concentrate on pending
and proposed updates in models for tropospheric delays, higher-order
ionospheric corrections, and GNSS orbital dynamics. The current
procedures of the ACs will be compared with each other and with recent
and future likely updates, including those from the IERS Conventions.
Presentations:
- P. Steigenberger, J. Böhm, V. Tesmer — Comparison
of GMF/GPT with VMF1/ECMWF & implications for atmosphere
loading
- M. Hernandez-Pajares, M. Fritsche, M.M. Hoque, N. Jakowski,
J.M. Juan, S. Kedar, A. Krankowski, E. Petrie,
J. Sanz — Methods & other considerations
to correct for higher-order ionospheric delays in GNSS
- M. Ziebart, A. Sibthorpe, C. Flohrer, T. Springer, Y. Bar-Sever,
B. Haines — Refinements
in GNSS orbit modeling
- S. Loyer, F. Perosanz, H. Capdeville (abstract) —
CNES-CLS dynamical
modelling of GPS orbits & SLR residuals
- J. Ray, J. Griffiths — Overview of
IGS products & Analysis Center modeling
- discussion of recommendations
Posters:
Background materials:
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12:00 - 13:30 | complimentary buffet lunch |
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poster viewing |
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13:30 - 15:30 | Pending & proposed product changes |
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chairs: Y. Bar-Sever, A. Krankowski, K. Senior, R. Weber
This session includes a summary of the activities of the IGS Working
Groups and wil focus on current status, pending, and future developments
of the core IGS products, e.g., ionosphere, troposphere, satellite
orbits, clocks, ERPs, etc.
Presentations:
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15:30 - 16:00 | coffee break |
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| 16:00 - 17:30 | Other analysis center developments & studies of general interest |
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chairs: R. Gross, S. Desai, U. Hugentobler, B. King
GNSS observations are sensitive to a wide-range of natural and man-made
phenomena, including ionospheric disturbances, tropospheric fluctuations,
tidal displacements, surface mass loading, and earthquake deformations.
This sensitivity not only allows GNSS observations to be used to
investigate these phenomena, but it also creates a market for the
development of improved models of these phenomena when they are needed
to reduce and/or interpret GNSS observations. This session will be a
forum for discussing sources of systematic errors that limit the
accuracy of GNSS models and products, including but not limited to
errors in tropospheric models, tide models, surface mass loading models,
and multipath signal models.
Presentations:
- C. Flohrer, G. Beutler, R. Dach, W. Gurtner, U. Hugentobler,
S. Schaer, T. Springer — Validation of
GNSS satellite orbits
- P. Barrett — The relative
contribution of the annual &
draconitic periods in GPS station position spectra
- A.W. Moore, S.L. Granger, S.E. Owen, F.H. Webb, E.J. Fetzer,
E.J. Fielding, E.F. Fishbein, C.F. Bjorndahl,
J. Lofgren — Toward correcting
InSAR images for tropospheric delay
- K. Larson, A. Bilich, V. Zavorotny, J. Braun,
E. Small — Making good from
bad: Can we use GPS multipath
to measure soil moisture content?
- summary of posters
- discussion of recommendations
Posters:
- J. Dousa — GOP AC's
development for the Ultra-rapid orbit product
- J. Dousa — GOP near-real
time processing background
- T.A. Springer, F. Dilssner, E. Schoenemann, M. Otten, I. Romero,
J. Tegedor, F. Pereira, J. Dow — ESOC new
developments & innovations
- C. Hackman, P. Barrett, V. Slabinski, J. Tracey,
W. Wooden — Progress at
the United States Naval Observatory Analysis Center
- J.C. Tracey, P.C. Kammeyer, N.G. Stamatakos — Usage of
the UT1-like quantity UTGPS at
the United States Naval Observatory
- S. Schaer, R. Dach, M. Meindl, H. Bock, C. Flohrer, A. Jäggi,
S. Lutz, L. Ostini, L. Prange, A. Steinbach, D. Thaller, P. Walser,
G. Beutler — Activities
at CODE Analysis Center
- H. Bock, R. Dach, S. Schaer, M. Meindl, G. Beutler
— CODE's
new high-rate GPS clock product
- S. Desai, W. Bertiger, B. Haines, D. Kuang, M. Miller,
C. Lane, F. Webb, J. Weiss — Recent
developments & plans at the JPL Analysis Center
- S. Owen, D. Dong, F. Webb, B. Newport, S. Kedar, A. Moore,
Z. Liu — Improvements in
analysis of large GPS networks at JPL
- R. Gross — An improved empirical model for the effect of
long-period ccean tides on polar motion
- R.F. Leandro, R.B. Langley, M.C. Santos — GNSS data
analysis in GAPS, the GPS Analysis and Positioning Software,
using IGS products
- F. Perosanz, R. Biancale, J.-C. Marty, S. Melachroinos,
S. Loyer — Surface load
models and validation by GPS positioning
- R. Dach, T. Springer, Z. Altamimi
— Experiment on impact
of constrained orbit parameters on station coordinates
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17:30 - 18:00 | Poster viewing |
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18:00 - 20:00 | Welcome Reception hosted by NGS — Di Lido South patio |
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Tuesday,
3 June 2008
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08:30 - 10:00 | Reanalysis campaign — Status of test periods |
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chairs: G. Gendt, R. Ferland, I. Romero, P. Steigenberger
During the IGS history several TRFs were applied and the ACs have
implemented many changes for software and technology improvements;
all led to various inconsistencies in the IGS products. A major
change was the introduction of the absolute antenna models, which
entered only with some approximation into the recent IRTF2005. The
IGS has to overcome these inconsistencies in their time series with
a reprocessing of its historical data since 1994 using the latest
models and the latest AC's software implementations. The improved
homogeneous products will allow better geophysical interpretations
and will result in a significantly better contribution to the next
realization of the ITRF. The reanalysis will also include more
stations to better address the requirements of the user community.
The session will concentrate on all activities related to the IGS
reprocessing. Evaluations of the reprocessing test campaign, which
shall identify problems in an early stage, and first results from the
IGS reprocessing, available up to this IGS Workshop, are welcome.
Also welcome are experiences from any reprocessing activities outside
the IGS, which can give valuable feedback to the IGS reprocessing
project.
Presentations:
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10:00 - 10:30 | coffee break |
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| 10:30 - 12:00 | Reanalysis campaign — Next steps & consequences |
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chairs: G. Gendt, R. Ferland, I. Romero, P. Steigenberger
Presentations:
- M. Fritsche, R. Dietrich, A. Rülke, P. Steigenberger,
M. Rothacher — Reprocessing of
a global GPS network: Experiences & results
- T.A. Springer, F. Dilssner, E. Schoenemann, I. Romero,
J. Tegedor, F. Pereira, J. Dow — ESOC IGS reprocessing
- A. Kenyeres, J. Legrand, C. Bruyninx, M. Figurski,
H. Habrich — Regional re-analysis:
Expectations & experiences within the EPN
- G. Wöppelmann, T. Schöne — Reprocessing
GPS data at the observation level for tide gauge
monitoring: Main raison d'être of TIGA
- discussion of recommendations
Posters:
- P. Steigenberger, M. Rothacher, M. Fritsche, A. Rülke,
R. Dietrich — PDR GPS satellite orbits
- I. Thomas, M. King, P. Clarke — Water vapour estimates
over Antarctica from 12 years of globally reprocessed GPS
solutions
- J.R. Rohde, M. Cline, W.H. Dillinger, R.L. Dulaney, J. Griffiths,
S. Hilla, W.G. Kass, J. Ray, G.F. Sella, R. Snay, T. Soler,
N.D. Weston — The GPS
data reanalysis campaign at the National Geodetic Survey
- T.A. Springer, F. Dilssner, E. Schoenemann, I. Romero,
J. Tegedor, F. Pereira, J. Dow — ESOC IGS reprocessing
(details)
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12:00 - 13:30 | complimentary buffet lunch |
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poster viewing |
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12:20 - 13:20 | Real-time Pilot Project committee meeting (members only) — Fisher Room |
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chair: M. Caissy
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13:30 - 15:30 | Progress in receiver calibrations & future developments |
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chairs: Y. Gao, G. Petit (not attending), T. Humphreys, L. Young, Th. Pany
The first half of the session will catalog the various biases that
affect IGS products and goals, including inter-frequency biases, phase
biases, and inter-system biases. The current status of IGS efforts to
address these biases will be described. Recommendations will be made
for modernizing the conventions used in bias calibration and for the
direction of future efforts.
The second half of the session will concentrate on desirable features of
future GNSS receivers for the IGS and for other high-precision geodetic
applications. The relative performance of several example observables
subsets will be analyzed to illustrate how the IGS can benefit from
modern GNSS signals. A hypothetical "dream receiver" will be introduced
along with practical alternatives for the near-term, including commercial
receivers and open-architecture software-defined receivers. A
dual-frequency software receiver will be demonstrated.
Presentations:
Posters:
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15:30 - 16:00 | coffee break |
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| 16:00 - 17:30 | Progress in antenna calibrations |
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chairs: R. Schmid, G. Wübbena (not attending), G. Mader, B. Haines
Since 5 November 2006, IGS products are based on an absolute model for
the phase centers of both the transmitting and receiving GNSS antennas.
This model comprises phase center estimates from global terrestrial data
for the satellite antennas, and robot-based calibrations as well as
converted field calibrations for the receiver antennas. Due to the
adoption of the ITRF2000 scale in the determination of satellite antenna
corrections, the transition from the relative to the absolute IGS model
led to an improvement of the consistency between the IGS and the ITRF
scale. Moreover, the consistency amongst the ACs could be improved.
However, there are still a lot of open issues. Ground-based and
space-based satellite antenna models agree well on the nadir- and
azimuth-dependent phase center variations (PCVs), but the z-offsets show
a considerable bias. The latest robot-based calibration of a Block IIA
antenna may help to clear up that problem. A combination of ground- and
space-based satellite antenna corrections could allow to consider
azimuth-dependent PCVs and to provide nadir-dependent PCVs beyond 14
degrees that are particularly important with regard to LEO missions.
As regards the receiver antennas, several institutions initiated
additional robot-based calibrations as well as anechoic chamber
measurements: on the one hand in order to replace converted field
calibrations, on the other hand to provide correction values for
uncalibrated antenna/radome combinations. However, the question of how
to add additional correction values to the IGS model without getting
consistency problems is not yet answered. In addition, there is an
increasing demand for calibrations using the GLONASS or the (future)
Galileo frequencies. Mitigation and empirical calibration of multipath
are additional topics of high relevance for the antenna session.
Presentations:
Posters:
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17:30 - 18:30 | Poster viewing |
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17:40 - 18:30 | Analysis Center splinter meeting (AC members only) — Fisher Room |
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chair: J. Ray
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19:00 - | Analysis Center group dinner (AC members only) |
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chair: J. Ray
An opportunity for the members of the IGS Analysis Centers to dine out
together at The Playwright Irish Pub & Restaurant, 1265 Washington Ave.,
for informal discussions.
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Wednesday,
4 June 2008
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08:30 - 10:00 | Real-time & near-real-time user requirements |
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chairs: G. Dick, J. Wang, G. Blewitt, P. Fang
This session will focus on identifying current and future users and
their requirements for the RT/NRT and other IGS products, assessing
the status of current products to meet the requirements, and proposing
future improvements. Main topics could include, but are not limit to,
the emerging needs of users for tsunami warning, earthquake monitoring,
operational numeric weather prediction (NWP) and weather research in
general, E-GVAP perspectives, climate applications, space weather,
time transfer, and LEO satellite tracking.
Presentations:
Posters:
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10:00 - 10:30 | coffee break |
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| 10:30 - 12:00 | Real-time & near-real-time IGS products |
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chairs: R. Weber, S. Gutman, T. Fuller-Rowell, Y. Mireault (not attending)
This session will discuss how current and possible future RT/NRT
products are (or may be) used, and what changes or improvements are
required to optimize these products. Presentations will focus on NRT
applications which could be based on upgraded orbit and clock products
as well as on atmospheric (ionospheric and tropospheric) models with
medium to low spatial and temporal resolution.
Presentations:
Posters:
- A. Karabatic, R. Weber, S. Leroch, T. Haiden — Near
real-time zenith wet delay estimation
- S. Gleason — Real-time applications of long-term GPS
orbit predictions
- O.L. Colombo — Precise real-time
differential navigation using NTRIP streams from continuously
operating, wide-area GNSS networksM
- A. Komjathy, B. Wilson, V. Akopian, X. Pi, M. Dumett, A.J. Mannucci,
C. Wang — JPL/USC GAIM: New
developments in using COSMIC & ground-based GPS data to
estimate high precision ionospheric products including VTEC
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12:00 - 13:30 | complimentary buffet lunch |
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poster viewing |
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13:30 - 15:30 | IGS network issues & challenges |
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chairs: B. Twilley (not attending), C. Bruyninx, Z. Altamimi, T. Herring
This session will focus on data quality and latency of the IGS network
data, their influence on the IGS products, and will investigate possible
means for improvement. Example topics are:
- stability of the IGS network, quality of the IGS reference frame
sites and what can be learned from the ITRF2005 and IGS coordinate
residuals;
- methods of detecting coordinate discontinuities, relation to the
IGS standards, and dissemination to the IGS users;
- relation between the completeness and latency of IGS data files
relative to IGS Rapid and Ultra-rapid products;
- methods of assessing and disseminating quality of IGS stations,
e.g. coordinate discontinuities, knowledge of effects such as
snow/ice on the antenna, failed sites and antennas;
- relationship between regional networks and the IGS.
Presentations:
- T. Herring (abstract) — Detection of GPS station position
errors due to instrumental and environmental effects
- Z. Altamimi — ITRF2005 residuals
and co-location tie issues
- I. Romero, T. Springer, P. Alfaro, J. Tegedor, F. Dilssner,
F. Pereira, M. Lorenzo, J. Feltens,
J. Dow (abstract) — The IGS network
and ESA processing
- M. Moore (abstract) — IGS, Regional
and local networks
- C. Bruyninx, J. Legrand,
F. Roosbeek (abstract) — GNSS network management procedures:
Application to the EPN
- discussion of recommendations
Posters:
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15:30 - 16:00 | coffee break |
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| 16:00 - 17:30 | Status of real-time & Pilot Project operations |
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chairs: M. Caissy, G. Weber, M. Ge (not attending), C. Garcia-Martinez
This session will focus on key activities that are on-going within the
context of the IGS Real-time Pilot Project and the work of the Real-time
Working Group. Several key activities will be highlighted including:
- the management of the network including station level management;
- the distribution of the data;
- the production and the distribution of real-time products;
- the investigation of formats for the delivery of data and products.
Presentations:
Posters:
- J. Dousa — Efficient
dissemination of the orbit predictions in real-time
- L. Agrotis, J. Dow, C. Garcia-Martinez, A. Ballereau,
P. Alfaro — Real time GNSS processing at ESOC: Infrastructure
& initial results
- M. Vennebusch, M. Ramatschi, J. Chen, C. Falck. M. Ge,
Th. Nischan, M. Rothacher — Realtime GNSS
activities at GeoForschungsZentrum Potsdam
- J.F. Galeral Monico — Experiences operating a real-time
network
- G. Weber, L. Mervart — The BKG Ntrip Client (BNC)
- G. Weber, C. Bruyninx — Monitoring the real-time IGS NTRIP interfaces
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17:40 - 18:00 | GO Forum demonstration |
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G. Walia, R. Neilan
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18:00 - 18:30 | Poster viewing |
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Thursday,
5 June 2008
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08:30 - 10:00 | Improvements in station installations |
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chairs: P. Elosegui, E. Hill, S. Williams, C. Meertens
The characterization, and reduction, of sources of site-dependent GNSS
error is vital to producing measurements that can reliably be used for
geophysical interpretation. This session will focus on new
developments concerning our understanding of these errors, with a view
to providing recommendations for their limitation at future site
installations. Particularly, we concentrate on studies into the
quantification and mitigation of monument motion, multipath
(far-field, near-field, and internal) and effects (both physical and
electrical) of local environment factors such as temperature, snow
cover, vegetation, and rainfall. We also elicit papers that discuss
the impact of certain equipment choices, such as deep- versus
shallow-braced monuments, the use of radomes (and their calibration),
and antenna mount design.
Presentations:
- C. Meertens, M. Jackson, A. Borsa, S. Fisher, D.
Maggert — Statistical analysis
of site effects on Plate Boundary Observatory time series
- J. Johansson, T. Ning, C. Granström, P. Jarlemark, M. Lidberg,
G. Hedling — Site-dependent
electromagnetic effects in high-accuracy applications of GNSS
- E. Hill, J. Davis, P. Elosegui, B. Wernicke, E. Malikowski,
N. Niemi — Are thermal effects responsible
for micron-level motions recorded at deep- and shallow-braced
monuments in a short-baseline network at Yucca Mountain, Nevada?
- S. Williams, M. King, J. Langbein — The stochastic
characterization of noise & signals in GNSS coordinate time
series: What do we know after 10 years of study?
- discussion of recommendations
Posters:
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10:00 - 10:30 | coffee break |
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| 10:30 - 12:00 | Data center operations & issues |
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chairs: C. Noll, H. Habrich, S. Cho, P. Jamason
This session will discuss recent data center developments and
proposals for handling equalization and validation of the Global Data
Center data and product holdings. Also covered will be data center
support of the IGS Real-Time Pilot Project as well as the re-analysis
campaign and integration of these products in the archives. Other
possible topics include utilities developed for data discovery.
Presentations:
- C. Noll — IGS Data Center
operations & issues: Overview
- W. Söhne, H. Habrich, G. Weber — Data centre
support for the IGS-RT PP
- P. Jamason, Y. Bock, F. Webb, S. Kedar, M. Pierce, R.-J. Chang,
D. Dong, P. Fang, R. Granat, I. MacLeod, J. Parker,
L. Prawirodirdjo, M. Squibb,
G. Wadsworth — GPS Explorer:
Overview & extension to INDIGO
- summary of posters
- discussion of recommendations
Posters:
- F. Vespe, G. Colucci —
GeoDAF: ASI (Italian Space
Agency) local data center
- S. Schaer, S. Lutz, M. Meindl, H. Bock, R. Dach —
Availability & completeness
of IGS tracking data
- H. Habrich, J. Kuscherka, E. Wiesensarter — New features
of the GNSS data center
- B. Garayt, E. Fourestier, P. Rebischung — IGN activities as
IGS Data Center & GNSS data analysis center
- C. Noll, M. Dube — NASA's Crustal Dynamics Data Information System
(CDDIS) and its support of the IGS, ILRS, IVS, and IDS
- G. Sella, R. Snay, M. Cline, D. Haw — CORS network
evolution & future developments
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12:00 - 13:30 | complimentary buffet lunch |
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poster viewing |
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13:30 - 15:30 | Future IGS & inter-technique SINEX combinations: Issues & challenges |
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chairs: D. Lavallée, R. Ferland, D. Thaller, T. Herring
This session will cover:
- IGS combination products and their possible future form
- Impact of other GNSS (GLONASS, Galileo) on the existing products
- The integration of IGS products into inter-technique combination
products
- Other techniques' products and their characteristics (strengths,
weaknesses, issues)
- New IGS products
The evolution of IGS products into their current form has been driven
by the need for robust, reliable and precise products. This session
will investigate issues for the IGS combination products with a strong
focus on the form of future IGS combination products and how they can
integrate into inter-technique products.
Subject areas of concern in current products/combination input and ideas
for future:
- Need for clear IGS procedures/conventions
- Direct and indirect constraint issues
- Products consistency
- New IERS proposed parameterisations
- Discontinuities
- Local surveys
- SINEX format issues (probably best addressed in File Formats
Session)
Presentations:
- D. Angermann, H. Drewes, M. Kruegel, B. Meisel — GPS in
the ITRF combination
- R. Dach, S. Schaer, M. Meindl, H. Bock, A. Jäggi,
S. Lutz, L. Ostini, L. Prange, A. Steinbach, D. Thaller,
P. Walser, G. Beutler— Aspects of
global multi-GNSS processing
- Z. Altamimi, X. Collilieux — IGS
contribution to ITRF
- D. Lavallee, R. Ferland, D. Thaller, T. Herring,
R. Biancale — Future IGS
& inter-technique SINEX combinations: Issues & challenges
- discussion of recommendations
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15:30 - 16:00 | coffee break |
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| 16:00 - 17:30 | Multi-GNSS & regional combined IGS products |
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chairs: R. Dach, F. Perosanz, M. Craymer, G. Wöppelmann,
C. Bruyninx
Regarding upcoming new GNSS and the improved GLONASS constellation we
will discuss aspects of the combination of corresponding observation
data with GPS. We would like to review the user needs concerning
combined products from the International GNSS Service, specifically
with respect to GLONASS (as it is nowadays common to use GPS/GLONASS
receiver models for surveying purposes). The next steps for the IGS and
the analysis groups towards IGS-combined GNSS products should be
defined. Issues related to the European Galileo, or the Chinese Compass
may also be addressed.
Contributions dealing with the combination of multiple GNSS are
welcome. This includes the full spectrum: from simulation studies on
the benefit for IGS products, up to current analysis limitations or
problems. In this context global as well as regional aspects will be
discussed.
In the second part, we want to focus on regional GNSS applications based
on multi-GNSS as well as GPS-only data processing.
We ask for papers that investigate the mitigation of true signals or
introduction of biases in regional networks with respect to global
solutions. On the other hand, contributions on methodologies for
efficiently mapping regional networks to the global network are also
welcome.
Presentations:
- T. Herring & the SNARF Working Group — SNARF 2.0:
A regional reference frame for North America based
on IGS products
- T. Herring — RNAAC combinations in the IGS
- T. Springer, F. Dilssner, E. Schoenemann, I. Romero, J.Tegedor,
F. Pereira, J. Dow — ESOC combined
GNSS processing
- F. Amarillo-Fernandez, M. Crisci, A. Ballereau, J. Dow,
M. Hollreiser, J. Hahn, J-L. Gerner —
The
Galileo ground mission segment performances
- Multi-GNSS processing position paper
- discussion of recommendations
Posters:
- G. Wöppelmann, M.-N. Bouin, Z. Altamimi, C. Letetrel,
A. Santamaria, X. Collilieux, G. Valladeau,
F. Lefèvre — Vertical velocities at tide gauges
from a completely reprocessed global GPS network of stations: How
well do they work?
- C. Bruyninx, Z. Altamimi, M. Becker, M. Craymer, L. Crombrinck,
A. Crombrinck, R. Fernandes, R. Govind, A. Kenyeres, B. King,
C. Kreemer, D. Lavallée, J. Legrand, L. Sanchez,
G. Sella — IAG Working Group "Regional Dense Velocity
Fields": Objectives & future plans
- J. Legrand, C. Bruyninx — Reference frame
definition in a regional GNSS network: Global or regional?
- R.M.S. Fernandes, H. Farah, A.Z.A. Combrink,
L. Combrinck — Testing processing
methodologies for the computation of AFREF solutions
- G. Gendt, W. Soehne, M. Rothacher, the GGSP Prototype Team — The
Galileo Terrestrial Reference Frame & its connection to the IGS
- M. Meindl, R. Dach, S. Schaer, U. Hugentobler — Developing
a generic multi-GNSS software package
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17:30 - 18:30 | Poster viewing |
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17:40 - 18:30 | Data Center splinter meeting (invitation only) — Fisher Room |
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chair: C. Noll
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Friday,
6 June 2008
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07:30 - 08:30 | complimentary continental breakfast |
08:30 - 10:00 | Product file formats & related issues |
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chairs: T. Springer, Th. Nischan, L. Estey, S. Hilla, W. Gurtner (not attending)
The IGS is using many, many different formats. The maintenance and in
particular the evolution of these formats is a very important but also a
very difficult task. The constant evolution of the IGS and its products, the
move towards real-time, and the future evolution of the different GNSS
constellations (e.g. the advent of Galileo, the introduction of a third
frequency, etc., etc.) do require changes in several of the formats. A
complicating issue in maintaining the formats is that many formats have
been adopted outside the IGS and even outside the GNSS world. This makes
changing the formats a difficult process. Also the fact that format
changes require software updates to be able to handle (read and/or
write) the new format is a very important factor, especially economically.
This has caused the IGS to prolong support for older formats, just to
give users an extended grace period to change over to a newer format.
Current points of discussion within the IGS are changes in the SP3c
format. Also there are some ongoing discussions about the RINEX3 format.
Needed are also enhancements in formats for handling the biases between
different observations like P1 and C1 since in the (near?) future there
will be three frequencies and on several of these frequencies different
observation types (e.g. Galileo with E5a, E5b, and E5a+b). Here the IGS
also should take a leading role in specifying which observations should
be delivered as a "minimum" by IGS receivers. With triple frequencies
there will be different ionosphere-free linear combinations. Depending
on which one is used, the estimated clock might be significantly different.
How can the IGS "unify" these clock estimates?
Formats currently used by the IGS are:
- RINEX
- SP3c
- SINEX
- Clock-Rinex
- IGS ERP-file
- Antex
- IONEX
- Tropo Sinex
- IGS site logs
- rcvr_ant.tab (official IGS antenna, receiver, & radome names)
- antenna.gra (is this file still needed for IGS site logs?)
In addition, there are various AC and combination summary reports,
which generally do not have rigid formats.
The focus of this session is threefold:
- Where are format changes needed?
- How can future formats be set up to be more extensible?
(like SINEX or XML?)
- Does the IGS need a more formal process to handle format
changes, other than just group e-mail? Should the IGS do more to
bring in the opinions of the world community when deriving new IGS
formats? Are there instances where the IGS could hand off the
responsibility of creating some new formats to some other
international body or national agency?
Presentations:
|
10:00 - 10:30 | coffee break |
|
| 10:30 - 12:00 | Closing discussions & recommendations |
|
chairs: G. Mader, J. Ray, G. Gendt
|
13:30 - 14:30 | IGS Governing
Board summary meeting (invitation only) — Fisher Room |
|
chair: J. Dow
|
|