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EUREF LOCAL ANALYSIS CENTRE
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Agency acronym : NKG
Institution : Nordic Geodetic Commission
Mail Address : Lantmäteriet, the Swedish mapping, cadastral and
: land registration authority
: SE-801 82 Gävle
Country : Sweden
Primary Contact
Contact Name : Lotti Jivall
Telephone : +46 26 633740
Fax : +46 26 610676
E-Mail : lotti.jivall@lm.se
Secondary Contact
Contact Name : Jan Johansson
Telephone : +46 31 772 5558
Fax : +46 31 772 5590
E-Mail : jan.johansson@chalmers.se
Third Contact
Contact Name : Tina Kempe
Telephone : +46 26 633856
Fax : +46 26 610676
E-Mail : christina.kempe@lm.se
Software Used : Bernese GPS Software Version 4.2 - GPS week -1320
: Bernese GPS Software Version 5.0 - GPS week 1321-
: Bernese GPS Software Version 5.2 - GPS week 1765-
Stat. Included in Analysis :
9-ID start stop network
ARGI00FRO (EUR) 1625 - now
ARJ600SWE (EUR) 1798 - now
BRUS00BEL (IGS) 0886 - 1675
BRUX00BEL (IGS) 1679 - now
CASB00IRL (EUR) 1820 - now
BUDP00DNK (EUR) 1202 - now
DRES00DEU (EUR) 1034 - 1913
FINS00FIN (EUR) 1941 - now
HAS600SWE (EUR) 1812 - now
HEL200DEU (EUR) 1910 - now
HERS00GBR (IGS) 0886 - now
HOBU00DEU (EUR) 1066 - now
HOER00DEU (EUR) 1243 - 1329
HOE200DEU (EUR) 1335 - 1762
HOFN00ISL (IGS) 0932 - now
INVR00GBR (EUR) 1528 - now
IRBE00LVA (EUR) 1893 - now
JOEN00FIN (EUR) 0886 - now
JOE200FIN (EUR) 1941 - now
JON600SWE (EUR) 1798 - now
JOZE00POL (IGS) 0886 - now
KAD600SWE (EUR) 1812 - now
KELY00GRL (IGS) 0886 - now
KEV200FIN (EUR) 1943 - now
KILP00FIN (EUR) 1943 - now
KIR000SWE (IGS) 0886 - now
KIR800SWE (IGS) 1882 - now
KLOP00DEU (EUR) 1034 - now
KURE00EST (EUR) 1477 - now
LEK600SWE (EUR) 1812 - now
LERI00GBR (EUR) 1936 - now
LOV600SWE (EUR) 1812 - now
MAR600SWE (IGS) 0886 - now
MAR700SWE (IGS) 1882 - now
METS00FIN (IGS) 0886 - now
MET300FIN (IGS) 1941 - now
NOR700SWE (EUR) 1798 - now
NYA100NOR (IGS) 0954 - now
NYAL00NOR (IGS) 0886 - 0952
ONS100SWE (IGS) 1882 - now
ONSA00SWE (IGS) 0886 - now
OSK600SWE (EUR) 1798 - now
OST600SWE (EUR) 1812 - now
OSLO00NOR (EUR) 0886 - 0961
OSLS00NOR (EUR) 1090 - now
OUL200FIN (EUR) 1941 - now
OVE600SWE (EUR) 1798 - now
POTS00DEU (IGS) 0886 - now
PTBB00DEU (IGS) 1059 - now
PULK00RUS (EUR) 1480 - now
QAQ100GRL (IGS) 1183 - now
RANT00DEU (EUR) 1846 - now
REDZ00POL (EUR) 1483 - now
REYK00ISL (IGS) 0886 - now
RIGA00LVA (IGS) 0886 - now
ROM200FIN (EUR) 1943 - now
SASS00DEU (IGS) 1235 - now
SAS200DEU (EUR) 1914 - now
SCOR00GRL (IGS) 1645 - now
SKE000SWE (EUR) 1238 - now
SKE800SWE (EUR) 1812 - now
SMID00DNK (EUR) 1225 - now
SODA00FIN (EUR) 0886 - now
SOD300FIN (IGS) 1943 - now
SPT000SWE (IGS) 1174 - now
STAS00NOR (EUR) 1090 - now
STAV00NOR (EUR) 0886 - 0961
SULD00DNK (EUR) 1225 - now
SUN600SWE (EUR) 1845 - now
SUR400EST (EUR) 1673 - now
SUUR00EST (EUR) 1395 - 1654
SVE600SWE (EUR) 1798 - now
SVTL00RUS (IGS) 0886 - now
SWKI00POL (EUR) 1483 - now
THU100GRL (IGS) 0848 - 1200
THU300GRL (IGS) 1201 - now
TOIL00EST (EUR) 1477 - now
TOR200EST (EUR) 1673 - now
TORA00EST (EUR) 1477 - 1646
TRDS00NOR (EUR) 1090 - now
TRO100NOR (IGS) 0954 - now
TROM00NOR (IGS) 0886 - 0955
TRON00NOR (EUR) 0886 - 0961
UME600SWE (EUR) 1798 - now
VAAS00FIN (EUR) 0886 - now
VAA200FIN (EUR) 1943 - now
VAE600SWE (EUR) 1798 - now
VARD00NOR (EUR) 0886 - 0961
VARS00NOR (EUR) 1090 - now
VIL000SWE (EUR) 0886 - now
VIL600SWE (EUR) 1798 - now
VIR200FIN (EUR) 1941 - now
VIS000SWE (IGS) 0886 - now
VIS600SWE (EUR) 1798 - now
VLNS00LTU (EUR) 1187 - now
WARN00DEU (IGS) 1242 - now
WSRT00NLD (IGS) 0924 - now
WRLG00DEU (EUR) 1914 - now
WTZR00DEU (IGS) 0886 - now
YEBE00ESP (IGS) 1085 - now
EUREF solutions generated : NKGwwww7.SUM Weekly processing summary file
for GPS week 'wwww' NKGwwww7.SNX Weekly coordinate solution in
SINEX format
NKGwwwwn.TRO Daily troposphere results in
tropospheric SINEX format, for
weekdays "n" (0-6)
EUREF solutions sent to : BKG
Report generated : 28/05/2001
Report updated : 28/05/2001
21/10/2001
10/10/2002
08/06/2005
01/12/2006
24/03/2011
11/05/2011
29/08/2011
25/01/2012
15/06/2012 --> BRUS removed and BRUX added
25/10/2012 --> IGB08 introduced, change of
fiducial stations
24/04/2013 --> SASS removed from list of
fiducial stations
--> BRUS removed from list of
fiducial stations (correction GW 1676-)
28/05/2013 --> REYK removed from list of
fiducial stations (from GW 1739)
25/10/2013 --> Fourth contact removed
07/11/2013 --> HOE2 removed
29/11/2013 --> Bernese V 5.2, GPS/GLO,VMF,HOI,ATL
12/08/2014 --> 10 Swedish EPN stations added GPS week 1798
22/09/2014 --> HOFN removed from list of
fiducial stations (from GW 1810)
--> JOZE removed from list of
fiducial stations (correction GW 1782-)
10/10/2014 --> 6 Swedish EPN stations added GW 1812
08/12/2014 --> CASB added
25/05/2015 --> SUN6 added GW 1845
27/05/2015 --> RANT added GW 1846
29/03/2016 --> KIR8, MAR7 and ONS1 added GW 1882
13/06/2016 --> IRBE added GW 1893
06/09/2016 --> HEL2 added GW 1910
29/09/2016 --> SAS2, WRLG added GW 1914. DRES removed
after GW 1913.
27/02/2017 --> IGS14 introduced, change of fiducial
stations.
LERI added GW 1936.
12/04/2017 --> 5 Finnish stations added GW 1941
6 Finnish stations added GW 1943
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MEASUREMENT MODELS
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Preprocessing : Phase preprocessing in a baseline-by-baseline mode using
triple differences. In most cases cycle slips are fixed
looking simultaneously at different linear combinations of
L1 and L2. If a cycle slip cannot be fixed reliably, bad
data points are removed or new ambiguities are set up. A
check of the postfit residuals is performed. Outliers are
removed for the final processing.
Since GPS-week 1321: 3 deg cut off in pre-processing
Basic Observable : Carrier phase, code only used for receiver clock
synchronization, elevation cut-off angle of 3 degrees,
sampling rate of 30 and 180 seconds, respectively.
Since GPS-week 1130: 10 deg in final solution
Since GPS-week 1400: 3 deg in final solution
Since GPS-week 1765: GPS and GLONASS
Modelled : Double differences, ionosphere-free linear combination.
observable
Ground antenna : Up to GPS-week 1399: Elevation-dependent phase center
corrections are applied phase center according to the
model IGS_01. The corrections are given calibrations
relative to the AOAD/M_T antenna.
Since GPS-week 1400: Absolute antenna phace center
variations (APCV) according to epn_05.atx (regularly
updated with I05.atx from CODE) are applied, partly
including individual APCV.
Since GPS-week 1632: Absolute antenna phace center
variations (APCV) according to epn_08.atx (regularly
updated with I08.atx from CODE) are applied, partly
including individual APCV (from epnc_08.atx).
Since GPS-week 1765: Missing system values(GLONASS) for
individual calibrated antenna models are filled with
values computed by adding the differences between
group values of GPS and GLONASS of the same antenna type
to the individually calibrated GPS values, if such group
values for the antenna type is available.
Since GPS week 1934: Absolute antenna phace center
variations (APCV) according to epn_14.atx (regularly
updated with I14.atx from CODE) are applied, partly
including individual APCV (from epnc_14.atx).
Troposphere : Up to GPS-week 1129: Saastamoinen apriori model: Zenith
path delay corrections derived using
1/cos(z).
Since GPS-week 1130: No troposphere apriori model used.
Zenith path delay corrections are
derived using DRY NIELL MF.
Since GPS-week 1321: Saastamoinen apriori model mapped with
DRY NIELL mapping function and ZTD
parameters estimated using WET NIELL
mapping function.
Since GPS-week 1765: Dry VMF as apriori model and ZTD
parameters estimated using WET VMF,
no apriori constraints.
Horizontal gradient parameters estimated
/day/station(Chen-Herring), no a priori
constraints.
Ionosphere : Not modelled (ionosphere eliminated by forming the
ionosphere-free linear combination of L1 and L2).
Up tp GPS-week 1320: Regional ionosphere maps are derived
in order to improve the QIF ambiguity
resolution.
Since GPS-week 1321: CODE global ionosphere models used to
improve QIF ambiguity resolution.
Since GPS-week 1765: 2nd order of ionospheric corrections
and ray bending corrections.
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ESTIMATED PARAMETERS (APRIORI VALUES & SIGMAS)
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Adjustment : Least-squares adjustment, mathematical correlations within
network correctly modeled. The elevation-dependent
observation weighting model adopted assumes a zero-
difference observation sigma being proportional 1/cos(z),
where z denotes the satellite zenith distance angle.
Rejection Criter.: up to week 1320: 0.003 meters for L3 residuals.
: since week 1321: Daily RINEX observation files containing
less than 12 hours good observations are
ignored. The threshold value concerning
data screening is 4 mm, specifically for
a normalized, or L1 zero-difference zenith
residual.
since week 1765: Daily RINEX observation files with short
observation time are rejected. The limit
is set to 300 "observations", which
approximately corresponds to 6h GPS/GLONASS
and 12 h GPS-data. The threshold value
concerning data screening is 5 mm,
specifically for a normalized, or L1 zero-
difference zenith residual. Stations/days
with large residuals in the combined weekly
solution are rejected from the weekly
combined solution but kept in the daily
solutions if it is not affecting other
stations.
Datum definition :
Datum definition for daily and weekly sol up to week 1363:
A 3-translation condition with respect to realization of
IGS00 is imposed. The list of station defining the datum
includes the following IGS stations:
ONSA,METS,POTS,NYA1,BRUS,WTZR
Datum definition for weekly solutions week 1364-1399:
A 3-translation condition with respect to realization of
ITRF2000 is imposed. The list of stations defining the
datum currently includes the following IGS stations
(automatic outlier detection using Helmert transformation
test and if necessary repeated ADDNEQ run with reduced
number of datum stations):
BRUS,JOZE,METS,NYA1,ONSA,POTS,WTZR
Datum definition for weekly solutions week 1400-1631:
A 3-translation condition with respect to realization of
IGS05 is imposed. The list of stations defining the datum
currently includes the following IGS stations (automatic
outlier detection using Helmert transformation test and if
necessary repeated ADDNEQ run with reduced number of datum
stations): BRUS,HOFN,JOZE,KELY,METS,NYA1,ONSA,POTS,QAQ1,
REYK,THU3,TRO1,WSRT,WTZR
Datum definition for weekly solutions week 1632-1675:
A 3-translation condition with respect to realization of
IGS08 is imposed. The list of stations defining the datum
currently includes the following IGS stations (automatic
outlier detection using Helmert transformation test and
if necessary repeated ADDNEQ run with reduced number of
datum stations): BRUS,BUDP,HOFN,JOEN,JOZE,KELY,MAR6,NYA1,
ONSA,POTS,PTBB,QAQ1,REYK,RIGA,SASS,SPT0,SVTL,THU3,TRO1,
VAAS,VARS,VIL0,WARN,WSRT,WTZR,YEBE
Datum definition for weekly solutions week 1676-1695:
Same defintion as above but changed fiducial stations:
BUDP,HOFN,JOEN,JOZE,KELY,MAR6,NYA1,ONSA,POTS,PTBB,QAQ1,
REYK,RIGA,SASS,SPT0,SVTL,THU3,TRO1,VAAS,VARS,VIL0,WARN,
WSRT,WTZR,YEBE
Datum definition for weekly solutions week 1696-1708:
Same defintion as above but changed fiducial stations:
BUDP,HOFN,JOEN,KELY,MAR6,NYA1,ONSA,PTBB,QAQ1,REYK,RIGA,
SASS,SPT0,SVTL,THU3,TRO1,VAAS,VARS,VIL0,WARN,WSRT,WTZR,
YEBE
Datum definition for weekly solutions week 1709-1734:
A 3-translation condition with respect to realization of
IGB08 is imposed. The list of stations defining the datum
currently includes the following IGS stations (automatic
outlier detection using Helmert transformation test and if
necessary repeated ADDNEQ run with reduced number of datum
stations): (same stations as above):
BUDP,HOFN,JOEN,KELY,MAR6,NYA1,ONSA,PTBB,QAQ1,REYK,RIGA,
SASS,SPT0,SVTL,THU3,TRO1,VAAS,VARS,VIL0,WARN,WSRT,WTZR,
YEBE
Datum definition for weekly solutions week 1735-1738:
Same defintion as above but changed fiducial stations:
BUDP,HOFN,JOEN,KELY,MAR6,NYA1,ONSA,PTBB,QAQ1,REYK,RIGA,
SPT0,SVTL,THU3,TRO1,VAAS,VARS,VIL0,WARN,WSRT,WTZR,YEBE
Datum definition for weekly solutions week 1739-1764:
Same defintion as above but changed fiducial stations:
BUDP,HOFN,JOEN,KELY,MAR6,NYA1,ONSA,PTBB,QAQ1,RIGA,SPT0,
SVTL,THU3,TRO1,VAAS,VARS,VIL0,WARN,WSRT,WTZR,YEBE
Datum definition for weekly solutions week 1765-1781:
A 3-translation condition with respect to realization of
IGB08 is imposed. The list of stations defining the datum
currently includes the following IGS stations (automatic
outlier detection using Helmert transformation test and
if necessary repeated ADDNEQ run with reduced number of
datum stations): HERS,HOFN,JOZE,MAR6,NYA1,ONSA,POTS,QAQ1,
RIGA,SCOR,THU3,TRO1,WSRT,WTZR,YEBE
Datum definition for weekly solutions week 1782-1809:
A 3-translation condition with respect to realization of
IGB08 is imposed. The list of stations defining the datum
currently includes the following IGS stations (automatic
outlier detection using Helmert transformation test and
if necessary repeated ADDNEQ run with reduced number of
datum stations): HERS,HOFN,MAR6,NYA1,ONSA,POTS,QAQ1,
RIGA,SCOR,THU3,TRO1,WSRT,WTZR,YEBE
Datum definition for weekly solutions week 1810-1933:
A 3-translation condition with respect to realization of
IGB08 is imposed. The list of stations defining the datum
currently includes the following IGS stations (automatic
outlier detection using Helmert transformation test and
if necessary repeated ADDNEQ run with reduced number of
datum stations): HERS,MAR6,NYA1,ONSA,POTS,QAQ1,RIGA,SCOR,
THU3,TRO1,WSRT,WTZR,YEBE
Datum definition for weekly solutions week 1934-now:
A 3-translation condition with respect to realization of
IGS14 is imposed. The list of stations defining the datum
currently includes the following IGS stations (automatic
outlier detection using Helmert transformation test and
if necessary repeated ADDNEQ run with reduced number of
datum stations): BRUX, HERS, HOFN, JOZE, KELY, MAR6, METS,
NYA1, ONSA, POTS, QAQ1, RIGA, SCOR, THU3, TRO1, WSRT,
WTZR, YEBE
Troposphere : Zenith path delay parameters are solved for at 1-hour
intervals for each station. At the end of each week, the 7
daily sets of troposphere estimates are re-computed on the
normal equation level by substituting the 7-day combined
station coordinate results.
Since GPS-week 1400: Troposphere gradient parameters
are also solved for.
Ionospheric : Up to GPS-week 1320: Regional TEC maps are derived from the
geometry-free linear combination of double differences.
The ambiguity-free maps are used to improve the QIF
ambiguity resolution. The ambiguity-fixed TEC maps are
made available in the IONEX format.
Since GPS-week 1321: No TEC maps solved for. The CODE global
TEC maps are used instead in the ambiguity resolution.
Ambiguity : Ambiguity resolution performed by using the QIF strategy in
conjunction with global TEC information. 10 deg cut-off.
Since GPS-week 1765: Also GLONASS ambiguity resolution.
Satellite clock : Satellite clock biases are not estimated but eliminated by
bias forming double differences.
Receiver clock : Receiver clock biases are estimated as part of the pre-
bias processing step using code measurements.
Orbits and ERPs : Up to GPS-week 1764: IGS combined final orbit and ERP
information.
Since GPS-week 1765: CODE final orbit and ERP information.
Tidal : Solid earth tidal displacements are modelled according to
displacements IERS Conventions. Ocean loading corrections are
computed based on Scherneck's amplitudes and phases.
GPS-week 1321-99: GOT00.
GPS-week 1400- : FES2004.
Up to GPS-week 1764: No atmospheric loading corrections are
applied. IERS conv. 96/2000
Since GPS-week 1765: Atmospheric tidal loading calculated
using atmospheric tidal model Ray and Ponte. Following
IERS conventions 2010.