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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 : 4CHAR start- stop
ARGI (EUR) 1625 - now
ARJ6 (EUR) 1798 - now
BRUS (IGS) 0886 - 1675
BRUX (IGS) 1679 - now
CASB (EUR) 1820 - now
BUDP (EUR) 1202 - now
DRES (EUR) 1034 - 1913
FINS (EUR) 1941 - now
HAS6 (EUR) 1812 - now
HEL2 (EUR) 1910 - now
HERS (IGS) 0886 - now
HOBU (EUR) 1066 - now
HOER (EUR) 1243 - 1329
HOE2 (EUR) 1335 - 1762
HOFN (IGS) 0932 - now
INVR (EUR) 1528 - now
IRBE (EUR) 1893 - now
JOEN (EUR) 0886 - now
JOE2 (EUR) 1941 - now
JON6 (EUR) 1798 - now
JOZE (IGS) 0886 - now
KAD6 (EUR) 1812 - now
KELY (IGS) 0886 - now
KEV2 (EUR) 1943 - now
KILP (EUR) 1943 - now
KIR0 (IGS) 0886 - now
KIR8 (IGS) 1882 - now
KLOP (EUR) 1034 - now
KURE (EUR) 1477 - now
LEK6 (EUR) 1812 - now
LERI (EUR) 1936 - now
LOV6 (EUR) 1812 - now
MAR6 (IGS) 0886 - now
MAR7 (IGS) 1882 - now
METS (IGS) 0886 - now
MET3 (IGS) 1941 - now
NOR7 (EUR) 1798 - now
NYA1 (IGS) 0954 - now
NYAL (IGS) 0886 - 0952
ONS1 (IGS) 1882 - now
ONSA (IGS) 0886 - now
OSK6 (EUR) 1798 - now
OST6 (EUR) 1812 - now
OSLO (EUR) 0886 - 0961
OSLS (EUR) 1090 - now
OUL2 (EUR) 1941 - now
OVE6 (EUR) 1798 - now
POTS (IGS) 0886 - now
PTBB (IGS) 1059 - now
PULK (EUR) 1480 - now
QAQ1 (IGS) 1183 - now
RANT (EUR) 1846 - now
REDZ (EUR) 1483 - now
REYK (IGS) 0886 - now
RIGA (IGS) 0886 - now
ROM2 (EUR) 1943 - now
SASS (IGS) 1235 - now
SAS2 (EUR) 1914 - now
SCOR (IGS) 1645 - now
SKE0 (EUR) 1238 - now
SKE8 (EUR) 1812 - now
SMID (EUR) 1225 - now
SODA (EUR) 0886 - now
SOD3 (IGS) 1943 - now
SPT0 (IGS) 1174 - now
STAS (EUR) 1090 - now
STAV (EUR) 0886 - 0961
SULD (EUR) 1225 - now
SUN6 (EUR) 1845 - now
SUR4 (EUR) 1673 - now
SUUR (EUR) 1395 - 1654
SVE6 (EUR) 1798 - now
SVTL (IGS) 0886 - now
SWKI (EUR) 1483 - now
THU1 (IGS) 0848 - 1200
THU3 (IGS) 1201 - now
TOIL (EUR) 1477 - now
TOR2 (EUR) 1673 - now
TORA (EUR) 1477 - 1646
TRDS (EUR) 1090 - now
TRO1 (IGS) 0954 - now
TROM (IGS) 0886 - 0955
TRON (EUR) 0886 - 0961
UME6 (EUR) 1798 - now
VAAS (EUR) 0886 - now
VAA2 (EUR) 1943 - now
VAE6 (EUR) 1798 - now
VARD (EUR) 0886 - 0961
VARS (EUR) 1090 - now
VIL0 (EUR) 0886 - now
VIL6 (EUR) 1798 - now
VIR2 (EUR) 1941 - now
VIS0 (IGS) 0886 - now
VIS6 (EUR) 1798 - now
VLNS (EUR) 1187 - now
WARN (IGS) 1242 - now
WSRT (IGS) 0924 - now
WRLG (EUR) 1914 - now
WTZR (IGS) 0886 - now
YEBE (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.
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