NASA GSFC IGEX-98HERP THU2 ENRI Electronic Navigation Research Institute, Japan ESA European Space...
Transcript of NASA GSFC IGEX-98HERP THU2 ENRI Electronic Navigation Research Institute, Japan ESA European Space...
IGEX-98DATA FLOW
Carey E. NollIGEX Data Flow Coordinator
NASA GSFCGreenbelt, MD 20771
IGEX-98 WorkshopNashville, TennesseeSeptember 13, 1999IGEX-98
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IGEX-98IGEX-98 DATA FLOW
! IGEX philosophy
! Participation summary
! IGEX data and products
! IGEX data flow
! IGEX data centers
! Problems encountered
! Conclusions/Recommendations
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IGEX-98IGEX PHILOSOPHY
! IGEX infrastructure modeled after the IGS
! Hierarchy of data centers
! Allows for redundancy and backup
! Reduces network traffic
! Many participants also serve within the IGS
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IGEX-98PARTICIPATION SUMMARY
! 74 receivers at 62 sites sent data to IGEX datacenters
– 47 dual-frequency
– 20 single-frequency
– 7 GPS-only receivers
! 30-35 receivers continue to operate
! 30 SLR stations– Tracked 18 GLONASS satellites
– Nearly 6,500 passes and 37K normal points archivedduring campaign
Santiago
McDonald
GreenbeltWashington, D.C.
Reykjavík
Thule
Amundsen-ScottNorth Pole
McMurdo
Hobart
Bellevue
Yaragadee
Pretoria
Sutherland
Taiwan
Tsukuba
Hong Kong
BorowiecHerstmonceux
Irkutsk
Kiruna
Mendeleevo
Metsahovi
Onsala
Zveningorod
Yakutsk
Petropavlovsk-Kamchatsky
120°105°90° 165°150°135°75°60°45°30°15°0°-15°-30°-45°-60°-75°-90°-105°-120°-135°-150°-165°
0°
30°
45°
60°
75°
-15°
-30°
-45°
-60°
-75°
15°
07/21/1999
Magadan
Khabarovsk
Mitaka
New Delhi
Lindfield
Leeds
Teddington
Maartsbo
Visby
Brest
Lexington
Gainesville
Irvine
Rio Grande
N'Koltang
La Réunion
Ekaterinburg
Great Yarmouth
Brisbane
Svetloe
INTERNATIONAL GLONASS EXPERIMENT (IGEX-98) NETWORK
Neubiberg
Bishkek
Delft (2)Neustrelitz
SèvresBrussels Wettzell
OberpfaffenhofenMattersburg
GrazZimmerwaldInnsbruck
Grasse
Vernon
Haleakala
Monument Peak
Simiez
Maidanak
Kunming
Komsomolsk
Beijing
Changchun
Wuhan
Shanghai
KashimaKoganeiMiuraTateyama
Simosato
Tahiti
Potsdam
Mt. StromloOrroral
Dual Frequency ReceiverSingle Frequency ReceiverSLR SystemCurrently Operating Receiver
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IGEX-98
IGEX DATA and PRODUCTS
! GLONASS DATA:
– Daily files (00:00:00 and 23:59:30 GPS time)
– 30-second sampling rate
– Observation, GPS and GLONASS navigation, and optional
meteorological data
– RINEX format (Hatanaka and UNIX compression)
– Data from receiver to global data center within 48 hours
! IGEX PRODUCTS:
– Daily or weekly GLONASS ephemerides in SP3 format
– Satellite clock information
– Earth rotation parameters
– Station coordinates in SINEX format
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IGEX-98
IGEX FILE NAMING CONVENTION(Data)
! Files named ssssddd0.yyt.Z where
– ssss is 4-character monument ID for site
– ddd is 3-digit day of year
– 0 indicates file contains all data for data day
– y y is 2-digit year
– t is file type
✦ o is observation file
✦ n is GPS navigation file
✦ g is GLONASS navigation file
✦ m is meteorological data file
✦ s is summary file containing data quality information
! Filenames in lowercase (except for the .Z)
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IGEX-98
IGEX DATA FLOW(General)
UserCommunity
Operational/Regional
Data Centers
Evaluation
Centers
Analysis Centers
GLONASS Stations
Global Data
Centers
IGEX Components
User Component
GLONASS Data
Data Products
Information
IGEX Data Flow (by Data Center) Acronyms
AUSLIG Australian Land Information Group
Station ODC RDC GDC BKG Bundesamt für Kartographic und Geodäsie, Germany
CDDIS Crustal Dynamics Data Information System, USA
BORG IBK1 VSLD CSIR Council for Scientific and Industrial Research, South Africa
BRUG METZ WTZG CSIRO Commonwealth Scientific and Industrial Research Organisation, Australia
DLFT MTBG WTZZ CSR Center for Space Research, University of Texas at Austin, USA
GRAB NPLB YAKT BKG DLR Deutsches Zentrum für Luft-und Raumfahrt, Germany
GTY1 NPLC ZIMJ DNR Department of Natural Resources, Australia
GTY2 REYZ ZIMZ DOLA Department of Land Administration, Australia
HERP THU2 ENRI Electronic Navigation Research Institute, Japan
ESA European Space Agency, Germany
EKAT GDC Global Data Center
MAGD TsNIIGAIK GFZ GeoForschungsZentrum, Germany
PKST GSI Geographic Survey Institute, Japan
HKPU Hong Kong Polytechnic University, China
KR0G OS0G IAA Institute of Applied Astronomy, Russia
MR6G VS0G OSO IFeN Institute of Applied Geodesy/University FAF Munich, Germany
IGN Institut Geographique National, France
BLVA IFeN IMVP Institute of Metrology for Time and Space, Russia
INASAN Institute of Astronomy, Russian Academy of Sciences
BIPD LRBA LDC Local Data Center
BRSG/T NKLG IGN LL Lincoln Labs, USA
GRAC REUN NIMA National Imagery and Mapping Agency, USA
NCKU National Cheng Kung University, Taiwan
DLRA NPL National Physical Laboratory, India
NTZ1 DLR CDDIS OC Operational Center
NTZ3 OSO Onsala Space Observatory, Sweden
RDC Regional Data Center
BISZ TsNIIGAIK Central Research Institute of Geodesy, Aerial Surveying, and Cartography, Russia
RIOZ GFZ UF University of Florida, USA
SUTG USGS U.S. Geological Survey, USA
USNO U.S. Naval Observatory, USA
LDS1 3S 3-S Navigation, USA
LDS2 ESALDS3
HOBRSTRR AUSLIGYARR
LINR CSIRO
BELR DOLABETR
CKO2 NCKUNCKU
SUNM DNR
NPLI NPL
IRKG MDVGIRKZ MDVZ IMVP
KHAB
SVT3 IAA
ZWEG INASAN
TSKA GSI
MTKA ENRI
HKPU HKPU
CSIR CSIR
SANG NIMA
GATR UF
3SNA 3S
MDOA CSR
SL1X LL
USNX USNO
CRAR USGS
GODZ
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IGEX-98IGEX DATA CENTERS
! Operational
– Data from station
– RINEX and QC data
– Transmit to regional or global data center
! Regional
– Gather data from operational centers
– Transmit to global data center
– BKG, DLR, GFZ, ESA, AUSLIG, NCKU
! Global
– Provide archive of and access to data and products
– CDDIS, IGN
10 IGEX-98 Data Flow 13-Sep-1999
IGEX-98PROBLEMS ENCOUNTERED
! Missing site logs: CKO2, EKAT, GATR, MAGD, NCKU, NPLI,PKST, YAKT
! TEQC– Required modification for GLONASS data type– Required modification to handle converter problems
! File format problems– Compression Gzip, not UNIX compress– ASCII not binary file transfer– Extra <CR>s
! File naming conventions– Upper vs. lower case– .Z indicating compressed file– Misnamed files (d instead of o)
! Null files transmitted to data centers
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IGEX-98
PROBLEMS ENCOUNTERED(RINEX related)
! RINEX headers– non-conformance to standard
– missing lines
! Receiver/antenna naming -- non-conformance to IGSstandards
! V1 instead of V2
! Satellite number 0– Valid output for GG24 receiver
– Invalid for RINEX
! RINEX converter problems– Time regression error with 3S converter
– Field overflow (phase data) in Z-18 converter
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IGEX-98
CONCLUSIONS/RECOMMENDATIONS
! Stations– Follow guidelines
! Operational data centers– Need to be clearly identified and consolidated (perhaps)
– Responsibilities defined
– Timeliness
– More rigorous QC
✦ TEQC
✦ DUT integrity monitoring s/w?
! Global data centers– Need to ensure consistent data holdings