[IGSMAIL-5476]: Recommendations IGS Workshop 2006

[Tim.Springer at esa.int]

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IGS Electronic Mail      13 Nov 07:33:25 PST 2006      Message Number 5476
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Author: Tim Springer


Dear IGS Colleagues,

Please find enclosed the summary and recommendations of the IGS Workshop. 

We apologise for the long delay in compiling this summary and 
recommendations. However, we are convinced that they are still very useful 
and worthwhile to read.

Furthermore we would like to inform you that we have started to process of 
generating the proceeding. If we are lucky we may be able to provide the 
proceedings as Christmas present. However, more realistic is that the 
proceedings will be available in the beginning of 2007. Meanwhile the 
papers will be added on our website where you can also download the 
presentations.

Web site link: http://nng.esoc.esa.de/ws2006/

Cheers,
Tim


IGS Workshop 2006
"The International GNSS Service (IGS): Perspectives and Visions for 2010 
and beyond"
 
Summary of Recommendations
 
Session : Reprocessing Issues, Standardization, New models (REPR) 

REPR1: 
Station selection will be a list of recommendations after analysing 
bmissing stationsb 
REPR2: 
NGA stations: Ask for full data set (past and current), otherwise no 
commitment. ACs should include them on a best effort basis.
REPR3: 
Processing summary: ACs need to provide information on their processing in 
the new summary before the reprocessing kick-off.
REPR4:
Recommendations for common standards documented in the position paper.
REPR5: 
Troposphere: GMF recommended; troposphere combination still open
REPR6:
P1-C1 DCBs to be used back to 1994 except for periods with AS off. As 
monthly averages or constant?
REPR7: 
Clock Files: Nominal 300 sec, 30 sec on a best effort basis (coordinated 
with LEO).
REPR8: 
For the current reprocessing effort weekly SINEX files shall be provided.
REPR9: 
Discontinuities: Should be indicated in SINEX files with validity 
intervals. Has to be clarified with combination centres.
REPR10: 
Reprocessed orbits should be validated with SLR.

 
 
Session: Ionosphere Products 

IONO1:
For analysis centers: To test the reprocessing performance and required 
resources in the IGS pilot reprocessing campaign (January-March 2000).
IONO2:
For analysis centers: To consider the temporal resolution increasing of 
the maps to 15 min (during pilot reprocessing campaign?).
IONO3:
For analysis centers: To consider the possibility of estimating maps of 
ionospheric effective heights (during pilot reprocessing campaign?).
IONO4:
For users, second order ionospheric correction: Importance of using a more 
realistic geomagnetic model, such as the International Geomagnetic 
Reference Model (IGRM, Geopack subroutines, Tsyganenko, 2001), with a 
reduction of up to ~60% of correction error in certain regions

 

Session: Preparing the Strategic Plan 2008-2012: Solicitation of Ideas on 
the Future Needs of Scientific and other Users (VISI)
 
 

VISI1:
The need for an IGS Strategic Planning (SP) retreat this year is 
confirmed.
VISI2:
IGS infrastructure is to be considered in the SP (HW, SW, monumentation) b 
a WG is needed.
VISI3:
IGS must identify and clarify the needs of its stakeholders (users, IGS 
centres, supporting organisations, IAG,b&) 
VISI4:
There is a need to establish and maintain a list of users (and their 
applications). Registration for product access may be considered (again).
VISI5:
An IGS WG should take care of interfaces with receiver manufacturers . In 
particular inputs concerning next generation receiver requirements should 
be gathered by the WG
VISI6:
GGOS becomes a central objective, with IGS playing a leading role,
intensifying interactions with other IAG services and commissions.
VISI7:
(Efficient) reprocessing must become a permanent feature of the IGS .
VISI8:
IGS has to play a more prominent role in the international context. More 
publications.

 
 
 
Session: Network and Data Centre issues (NWDC)
 

NWDC1:
All IGS data flow is performed using bpushb only and verified uncorrupted.
NWDC2:
Stations/OCs, ODCs, and RDCs will define primary and secondary data 
centers to push their data to; IGS CB will create and maintain 
supplemental material summarizing this data flow
NWDC3:
Stations/OCs should document replacement of data files and notify the IGS 
through automated procedures
NWDC4:
IGS DCWG : 
a) Perform limited test during 2006
d) Specify detailed implementation plan


Session: Real Time Network and Products (REAL)
 

REAL1:
Call for participation in the pilot project shall be completed as soon as 
possible.
REAL2:
The RTIGS working group shall complete the planned network in time for the 
start of the pilot project.
REAL3:
The pilot project shall involve the broadest participation as possible 
from both within and outside of the IGS community.
REAL4:
RTCM 3.0 shall be investigated for the purpose of determining whether or 
not it is a suitable format for adoption as the standard for use within 
the real-time IGS.
REAL5:
During the pilot project, NTRIP shall be evaluated as a data and product 
delivery mechanism.
REAL6:
The NTRIP community shall be encouraged to provide the UDP protocol as an 
option for the NTRIP server.

 
 
Session: GGNSS Modernization and GNSS/LEO Synergies (GNSS)
 

GNSS1:
IGS ACB4s are encouraged to upgrade their current software capabilities to 
enable processing of hybrid GNSS data in order to base their submissions 
to all IGS product lines (orbits, clocks and atmosphere monitoring) on a 
complete set of GPS+GLONASS data.
GNSS2:
IGS ACbs (in dialog with manufacturers) are asked to perform simulation 
studies to identify an adequate/preferred ensemble of GNSS signals (based 
on currently available and upcoming GNSS signals) to be delivered by new 
GNSS receiver types which allows to improve (at least ensures to keep) the 
current quality of IGS GNSS products.
GNSS3:
IGS ACbs are encouraged to further integrate their LEO processing 
facilities with their IGS routine analysis facilities, in order to improve 
the understanding of current results for CHAMP and GRACE, and to enable 
LEO data analysis in parallel to the IGS re-processing effort.


Session: Switch to the absolute antenna phase center model (ABSA)
 

ABSA1:
Transition to absolute PCVs (igs05_wwww.atx) is planned in parallel with 
the switch to the new ITRF2005 (~Sept 2006).
ABSA2:
Existing calibrations in the ANTEX file (igs05_wwww.atx) will not be 
changed after the transition. Until that converted field calibrations can 
only be replaced by robot calibrations if not affecting the RF stations.
ABSA3:
Add the storage of GLONASS specific receiver antenna corrections and 
carrier-to-noise patterns (CN0) to the ANTEX format
ABSA4:
SINEX files shall include SATA_Z parameters (constrained).

 
 
Session: Identification and Mitigation of GNSS Errors (ERRO) 
 
 

ERRO1:
IGS should stimulate research leading to a better understanding of the 
different error sources and technique-related problems, in particular of 
not well understood effects such as near-field and internal multipath and 
their mitigation.
Possibilities are the organization of dedicated workshops or sessions at 
assemblies such as AGU or EGU or the preparation of a Journal of Geodesy 
Special Issue, inviting a wider community for participation.
ERRO2:
Improve consistency between AC products and of combined IGS products, in 
particular for precise point positioning. As a first step ACs shall fill 
an analysis questionnaire that gives a detailed description of the 
analysis. Consistency with respect to used IERS Conventions has to be 
verified. All ACs shall implement the recommendation of Bern concerning 
consistency of orbits and clocks with ITRF.
ERRO3:
The ACs shall evaluate the effects of Earth albedo and MW power thrust, 
the GMF/VMF1 mapping function, an improved hydrostatic zenith path delay 
(i.e., mean sea surface air pressure), higher order ionosphere 
corrections.
ERRO4:
The effect of monumentation on near field multipath shall be studied 
further to identify an optimum monumentation. IGS station operators shall 
be encouraged to use optimum monument designs.
ERRO5:
Overlap position differences of consecutive orbits shall be added to the 
rapid and final combination protocols.
ERRO6:
The interface to receiver manufacturers has to be intensified to possibly 
agree on a common minimal tracking mode for IGS like activities. 
Investigate the possibility to use the GSTB-V2 network for studying the 
optimum Galileo signal combination.