Description
The core product of the EUREF Permanent Network is the weekly estimates of the coordinates of the EPN tracking stations and their covariance information. These coordinates are outcome from the so-called "combined EPN solution" which is based on the subnetwork solutions submitted by the EPN Analysis Centres (LAC).
Overview
The weekly combined EPN solution is created after removing the constraints from the subnetwork solutions from the individual Analysis Centres. The weekly EPN solutions are given in the successive reference frames of the International Terrestrial Reference System through a set of "reference stations" (called fiducial stations).
| Type | Period (GPS week) | Reference Frame | Fiducial stations | Alignment method | Available from |
| Routine | Jul 1996 - Feb 1998 (0860 - 0946) |
ITRF94 | BRUS, GRAZ, KOSG, MATE, METS, ONSA, WTZR, ZIMM | Heavy constraints on the fiducial stations | BKG (WWWW/eurWWWW7.[crd|snx|sum].Z) |
| Routine | Mar 1998 - Oct 1998 (0947 - 0981) |
ITRF96 | BOR1, GRAZ, KOSG, MATE, ONSA, POTS, REYK, VILL, WTZR, ZIMM, ZWEN | Heavy constraints on the fiducial stations | BKG (WWWW/eurWWWW7.[crd|snx|sum].Z) |
| Routine | Nov 1998 - Jul 1999 (0982 - 1020) |
ITRF96 | BOR1, GRAS, GRAZ, KOSG, MATE, ONSA, POTS, REYK, VILL, WTZR, ZIMM, ZWEN | Heavy constraints on the fiducial stations | BKG (WWWW/eurWWWW7.[crd|snx|sum].Z) |
| Routine | Aug 1999 - Apr 2000 (1021 - 1056) |
ITRF97 | BOR1, GRAS, GRAZ, KOSG, MATE, NYA1, ONSA, POTS, REYK, THU1, TRO1, VILL, WTZR, ZWEN | Heavy constraints on the fiducial stations | BKG (WWWW/eurWWWW7.[crd|snx|sum].Z) |
| Routine | Apr 2000 - Nov 2001 (1057 - 1142) |
ITRF97 | BOR1, GRAS, GRAZ, KOSG, MATE, NYA1, ONSA, POTS, REYK, THU1, TRO1, VILL, WTZR | Heavy constraints on the fiducial stations | BKG (WWWW/eurWWWW7.[crd|snx|sum].Z) |
| Routine | Dec 2001 - Jan 2002 (1143 - 1147) |
ITRF2000 | BOR1, GRAS, GRAZ, KOSG, MATE, NYA1, ONSA, POTS, REYK, THU1, TRO1, VILL, WTZR | Heavy constraints on the fiducial stations | BKG (WWWW/eurWWWW7.[crd|snx|sum].Z) |
| Routine | Jan 2002 - Jul 2004 (1148 - 1278) |
ITRF2000 | BOR1, GRAS, GRAZ, KOSG, MATE, NYA1, ONSA, POTS, REYK, TRO1, VILL, WTZR | Heavy constraints on the fiducial stations | BKG (WWWW/eurWWWW7.[crd|snx|sum].Z) |
| Routine | Jul 2004 - Dec 2004 (1279 - 1302) |
ITRF2000 | BOR1, GRAS, GRAZ, KOSG, MATE, NYA1, ONSA, POTS, REYK, VILL, WTZR | Heavy constraints on the fiducial stations | BKG (WWWW/eurWWWW7.[crd|snx|sum].Z) |
| Routine | Dec 2004 - Nov 2006 (1303 - 1399) |
ITRF2000 | BOR1, GRAS, GRAZ, KOSG, MATE, NYA1, ONSA, POTS, REYK, VILL, WTZR | Minimal constraints conditions on fiducial stations | BKG (WWWW/eurWWWW7.[crd|snx|sum].Z) |
| Routine | Nov 2006 - Apr 2011 (1400 - 1631) |
ITRF2005/IGS05 | BOR1, BRUS, CAGL, GLSV, GRAS, HOFN, JOZE, MATE, METS, NICO, NOT1, NYA1, NYAL, ONSA, POLV, POTS, RABT, RAMO, REYK, SFER, TRAB, TRO1, VILL, WSRT, WTZR, ZIMM | Minimal constraints conditions on fiducial stations | BKG (WWWW/eurWWWW7.[crd|snx|sum].Z) |
| Routine | Apr 2011 - present (1632 - present) |
IGS08 | ACOR, AJAC, ALAC, ALME, ANKR, BELL, BOGO, BOR1, BRST, BRUS, BUCU, BUDP, BZRG, CAGL, CAGZ, CANT, CASC, CHIZ, DRAG, DUBR, EBRE, EIJS, GENO, GLSV, GOPE, GRAS, HELG, HERT, HOFN, IENG, ISTA, JOEN, JOZ2, JOZE, KELY, KHAR, KIRU, KOSG, LAGO, LAMA, LAMP, LPAL, LROC, MALL, MAR6, MARS, MAS1, MATE, MDVJ, MEDI, METS, MIKL, MORP, NEWL, NICO, NOT1, NYA1, ONSA, ORID, PADO, PDEL, PENC, POLV, POTS, PTBB, QAQ1, RABT, RAMO, REDU, REYK, RIGA, SASS, SFER, SJDV, SOFI, SPT0, SULP, SVTL, TERS, THU3, TRO1, TUBI, UNPG, VAAS, VALE, VARS, VIL0, VILL, WARN, WROC, WSRT, WTZR, YEBE, ZECK, ZIMM | Minimal constraints conditions (translation only) on fiducial stations | BKG (WWWW/eurWWWW7.[crd|snx|sum].Z) |
| REPRO1 | Jan 1996 - Jan 2007 (834 - 1408) |
IGS05 | BOR1, BRUS, CAGL, GLSV, GRAS, HOFN, JOZE, MATE, METS, NICO, NOT1, NYA1, NYAL, ONSA, POLV, POTS, RABT, TRAB, TRO1, VILL, WSRT, WTZR, ZIMM | Minimal constraints (translation only) on fiducial stations | BKG (WWWW/eu0WWWW7.[crd|snx|sum].Z) |
The EPN LACs use the IGS orbits for the computation of their subnetwork solutions. To guarantee the consistency between the reference frame used for the orbits and the constraints on the coordinates, the switch between successive ITRFxx realizations is done simultaneously with the update of the reference frame used for the computation of the IGS orbits.
Availability
The combined EPN solution is available with a delay of about 4 weeks. It contains the following files:
- EURwwww7.SNX : Weekly combined EPN solution for GPSweek wwww (in SINEX format)
- EURwwww7.SUM : Weekly Summary file describing combined EPN solution for GPSweek wwww
The files can be retrieved through anonymous ftp from:
ftp://igs.bkg.bund.de/EUREF/products/
and
ftp://epncb.oma.be/pub/product/combin/
in sub-directories named following the current GPS week.
Combination of the subnetwork solutions
The strategy used to combine the individual subnetwork solutions into the combined EPN solution
is available in the weekly Summary Files
(example),
which are distributed through
EUREF Mail
or in the combination
reports
that are sent out to the LAC's.
Combination Centre:
| Period | Agency |
| (GPS week 0836 - 1019) | CODE (Centre for Orbit Determination in Europe) |
| (GPS week 1020 - present) | BKG (Bundesamt für Geodäsie und Kartographie, Frankfurt) - Heinz Habrich |
Submission to the IERS
In order to include the EPN stations in the successive realisations of the International Terrestrial References Frame (ITRS), EUREF has responded to the related IERS Calls for Participation. Up to now the following multi-year solutions have been submitted to the IERS:
EPN Central Bureau - Royal Observatory of Belgium