Author: T.A. Springer ******************************************************************************* EUREF REPORT FOR GPS WEEK 0898 (DAYS 082-088, DATES 23-03-97 - 29-03-97) ******************************************************************************* Report of the combination of the European weekly GPS solutions International Association of Geodesy Commission X - Global and Regional Geodetic Networks Subcommission for Europe (EUREF) Contributing Solutions: ----------------------- Group Description Contribution ASI - Nuova Telespazio S.p.A., Space Geodesy Center SINEX BEK - International Commission for Global Geodesy of SINEX the Bavarian Academy of Sciences (BEK) COE - European solution created at CODE SINEX (Center for Orbit Determination in Europe) GOP - Geodetic Observatory Pecny, Czech Republic SINEX IFG - Institute for Applied Geodesy in Germany (IfAG) SINEX LPT - Bundesamt fuer Landestopographie (L+T), Switzerland SINEX NKG - Nordic Geodetic Commision (NKG) SINEX OLG - Observatory Lustbuehel Graz (OLG) SINEX ROB - Royal Observatory of Belgium (ROB) SINEX WUT - Warsaw University of Technology (WUT) SINEX SINEX: Software independent exchange format Version 0.05 or 1.00 Submitted by: Center for Orbit Determination in Europe (CODE) Astronomical Institute, University of Berne, Switzerland Contact : T.A. Springer (springer@aiub.unibe.ch) Products available through anonymous ftp using: A) ftp ubeclu.unibe.ch -or- ftp 130.92.6.11 after login: cd aiub$ftp; cd euref B) ftp igs.ifag.de -or- ftp 141.74.240.26 after login: cd pub/EUREF/CLUSTERS/wwww (GPS week wwww) C) ftp ftpserver.oma.be -or- ftp 193.190.249.203 after login: cd pub/astro/euref/product/combin Processing Strategy: -------------------- - The combined weekly EUREF solution (EUR) was created after removing the Analysis Center specific constraints. - Covariance rescaling factors are derived from the sampling rate used by each center. In fact all solutions contribute to the combined solution with the same weight. For ASI we use a rescaling factor which is a compromise between the estimated formal rms of the vertical components and the horizontal components. In comparison to the other solutions we find larger horizontal formal rms values (probably no ambiguity resolution) but smaller vertical rms values (probably lower elevation cut-off). Starting with week 0897 the rescaling is changed to give the resulting EUREF solution a more realistic formal errors. - We perform free network solutions, specifying 6 no-net translation and rotation constraints to define the geodetic datum of the combined solution. We use the ITRF93 coordinates (up to GPS week 0859) respectively the ITRF94 coordinates (since GPS week 0860) of the sites BRUS, KOSG, TROM, MATE, WTZR, GRAZ and ZIMM to align the free solutions with the terrestrial reference frame. Starting with week 0897 METS and VILL were added to define the reference frame. - The comparisons between each individual solution and the combined solution is done using a 7-parameter Helmert transformation. The Helmert parameters are determined using all sites of the individual solutions. - In the first Table unweighted rms values (for the coordinate components in the local system North-East-Up), derived from the Helmert residuals, are shown for each site. - In the second table an (unweighted) rms is computed for each Analysis Center. These values are derived from the Helmert residuals of all sites of a particular Analysis Center. AVAILABLE FILES: ----------------------------------------------------------------------------- EUR08987.SUM THIS TEXT FILE EUR08987.SNX COMBINED EUROPEAN SOLUTION FOR GPS WEEK 0898 ----------------------------------------------------------------------------- REMARKS: Station MADR removed from all solutions in which it occured. MADR has been behaving very anomolous since the start of 1997. COMBINATION GPSWEEK 0898, EUROPE ------------------------------------------------------------------------------- PROCESSED FILES : 10 TOTAL NUMBER OF STATIONS: 54 ------------------------------------------------------------------------------- 0000000001 RESIDUAL RMS IN MM STATION #FILES 1234567890 N E U ------------------------------------------------------------------------------- CAGL 12725M003 3 MMM 2.2 1.6 10.6 MATE 12734M008 5 NNN N N 0.4 0.9 3.6 MEDI 12711M003 4 MMM M 0.8 0.7 3.3 NOTO 12717M003 3 MMM 1.3 1.0 5.0 VENE 3 MM M 1.1 1.7 8.0 WTZR 14201M010 9 N NNNNNNNN 0.8 0.9 3.7 ANKR 20805M002 3 MM M 1.8 2.0 13.4 GRAS 10002M006 4 MM M M 0.3 0.2 2.5 EBRE 13410M001 2 MM 0.7 1.4 6.4 MASP 31303M002 2 MM 2.3 1.4 5.9 SFER 13402M004 2 MM 1.0 0.4 6.9 UPAD 12750M002 5 MM MMM 1.0 0.9 2.8 VILL 13406M001 2 NN 1.9 0.9 12.0 ZIMM 14001M004 5 NN N NN 0.7 0.7 2.5 BOR1 12205M002 3 M M M 0.5 0.3 1.7 KOSG 13504M003 6 N NNN NN 0.6 0.9 2.3 BRUS 13101M004 4 N N N N 0.8 0.9 3.0 BOGO 4 MM M M 0.4 0.9 3.2 GOPE 11502M002 4 MM M M 0.6 0.3 1.9 GRAZ 11001M002 5 NNNN N 0.3 0.7 2.6 HERS 13212M007 4 M M M M 0.9 2.1 3.9 JOZE 12204M001 5 MM MM M 0.5 2.7 5.0 KIRU 10403M002 2 M M 0.4 2.7 6.9 METS 10503S011 5 NNN N N 1.2 2.6 8.3 ONSA 10402M004 5 MMM M M 0.7 2.9 3.9 POTS 14106M003 5 M M MMM 0.2 1.0 5.1 REYK 10202M001 3 M M M 2.2 1.6 5.5 LAMA 12209M001 3 M M M 0.6 0.4 7.5 ZWEN 12330M001 3 MMM 1.7 0.6 2.5 MDVO 12309M002 3 MM M 0.2 2.2 6.8 PENC 11206M006 3 M M M 0.7 0.5 5.5 KELY 43005M001 2 M M 5.5 1.2 2.1 NYAL 10317M001 2 M M 2.5 1.1 11.0 HFLK 11006S003 3 M M M 0.7 0.4 6.6 MOPI 3 M M M 0.6 0.1 6.2 OBER 14208M001 2 M M 0.1 0.4 4.1 WROC 3 M M M 0.1 0.7 5.8 VAAS 1 M - - - VARD 1 M - - - JOEN 1 M - - - VIS0 1 M - - - KIR0 1 M - - - STAV 1 M - - - TRON 1 M - - - MAR6 1 M - - - VIL0 1 M - - - OSLO 1 M - - - RIGA 1 M - - - SODA 1 M - - - SVTL 1 M - - - DENT 13112M001 1 M - - - DOUR 13113M001 1 M - - - DELF 13502M004 1 M - - - WARE 13114M001 1 M - - - ------------------------------------------------------------------------------- FLAGS: M: MEAN, F: FIXED, N: FREE NETWORK RESTRICTIONS 1 ------------------------------------------------------------------------------- UNWEIGHTED RMS VALUES WITH RESPECT TO THE COMBINED SOLUTION IN MM ------------------------------------------------------------------------------- PROCESSED FILES : 10 TOTAL NUMBER OF STATIONS: 54 ------------------------------------------------------------------------------- FILE GRP #SITES COV.COMP. COMPONENT RMS --------------------------------------------------- N 0.7 1 ASI 6 0.0080 E 1.7 U 1.1 --------------------------------------------------- N 1.1 2 BEK 13 0.0200 E 0.9 U 7.5 --------------------------------------------------- N 1.3 3 COE 33 0.0200 E 1.0 U 4.4 --------------------------------------------------- N 0.5 4 GOP 11 0.0200 E 1.1 U 2.8 --------------------------------------------------- N 0.9 5 IFG 14 0.0200 E 1.2 U 5.3 --------------------------------------------------- N 0.3 6 LPT 6 0.0200 E 0.3 U 2.4 --------------------------------------------------- N 1.1 7 NKG 25 0.0200 E 2.0 U 4.5 --------------------------------------------------- N 0.2 8 OLG 17 0.0200 E 0.4 U 3.6 --------------------------------------------------- N 0.3 9 ROB 11 0.0200 E 0.2 U 1.3 --------------------------------------------------- N 0.5 10 WUT 15 0.0200 E 0.7 U 5.2 --------------------------------------------------- N 0.9 MEAN 54 E 1.1 U 4.4