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8th EPN LAC Workshop, Brussels, May 15–16
Report of the WUT LAC
T. Liwosz, J. Rogowski
Warsaw University of TechnologyDepartment of Geodesy and Geodetic Astronomy
Pl. Politechniki 1, 00-661 Warsaw
8th EPN LAC WorkshopBrussels, May 15–16, 2013
Liwosz and Rogowski Report of the WUT LAC
8th EPN LAC Workshop, Brussels, May 15–16
Contents
This report contains the following topics:1 Routine analysis:
ProductsStrategy descriptionNetwork characteristics
2 Analysis of Poland’s national GPS reference network
3 GNSS analysis with GLONASS-specific PCVs
4 Outlook
Liwosz and Rogowski Report of the WUT LAC
8th EPN LAC Workshop, Brussels, May 15–16
WUT Products
Currently WUT contributes to EPN with the following products:Final (operational)
weekly coordinate estimates (wutWWWW7.snx)daily coordinate estimates (wutWWWWD.snx)daily tropospheric delays (wutWWWWD.tro)
Rapid (since week 1565, January 2010)daily coordinate estimates (wutWWWWDr.snx)rapid multi-day time series (since February 2011); dedicatedweb page created and maintained by EPN CB
Reprocessed results from a period 1996–2006
Liwosz and Rogowski Report of the WUT LAC
8th EPN LAC Workshop, Brussels, May 15–16
Processing strategy
Summary of current strategy:
Software: Bernese GPS Software version 5.0
processing performed according to EPN LAC Guidelines
GPS and GLONASS (since week 1609) observations analyzed
CODE orbits and ERPs
antenna calibration tables: epn08 wwww.atx
Ambiguity resolution for GPS satellites: L1&L2, L5/L3, QIFdepending on baseline length
Reference Frame: IGS08
Sites used for NNT minimum constraints: usable IGb08stations (currently 16)
Liwosz and Rogowski Report of the WUT LAC
8th EPN LAC Workshop, Brussels, May 15–16
WUT Subnetwork
−40˚ −20˚ 0˚ 20˚ 40˚30˚
40˚
50˚
60˚
70˚
GPS
GNSS
IGb08
KELY, NYA1 and THU3 outside the map
Network status:79 stations:
61 GNSS (77%)16 IGb085 proposed
Since 2011:
4 new
4 former
Liwosz and Rogowski Report of the WUT LAC
8th EPN LAC Workshop, Brussels, May 15–16
Poland’s national GNSS reference network
In the end of 2011, for the Polish NMA – Head Office for Geodesyand Cartography (GUGiK), we processed Poland’s national GNSSreference network and created a new national realization ofETRS89 for Poland.
Liwosz and Rogowski Report of the WUT LAC
8th EPN LAC Workshop, Brussels, May 15–16
Poland’s national GNSS reference network
15˚ 20˚ 25˚
50˚
55˚
POLREF
EUREF−POL
1st class
EUVN
ASG−PL/CZEPOS/LITPOS/SAPOS/SKPOS
EPN/IGS
Two campaigns:1 20082 2010/2011
66 days
∼700 sites processed
Liwosz and Rogowski Report of the WUT LAC
8th EPN LAC Workshop, Brussels, May 15–16
National network: Data analysis and results
Software: Bernese GPS Software version 5.0
Data processed with two elevation masks: 5◦ and 10◦
EPN cumulative solution (C1600) as reference (35 stations)
Statistics of combined solutions:
Solution type Repeatability (mm) RMS # observationsN E U (mm)
WUT ASG-PL 5◦ 1.20 1.23 3.11 1.29 38 617 779WUT ASG-PL 10◦ 1.38 1.30 3.47 1.32 33 532 898
Final coordinates (solution WUT ASG-PL 5◦) expressed in:
ITRF2005 at epoch 2011.0
ETRF2000(R05) at epoch 2011.0
Liwosz and Rogowski Report of the WUT LAC
8th EPN LAC Workshop, Brussels, May 15–16
GNSS analysis with GLONASS-specific PCVs
Since igs08.atx, IGS supports the receiver GLONASS specific PCC.Tests performed to check the effect on coordinates:
three solutions with same baseline definition:1 GNSS: GNSS obs. with GPS PCVs for both systems2 GNSSPCV: GNSS obs.; GPS and GLONASS specific PCVs
for GPS and GLONASS obs. respectivelyour own implementation into Bernese GPS Software ver. 5.0constant values, for k = 0, used for all other channels kGLONASS freqs. used for GLONASS L3 PCV
3 GPS: only GPS obervations used
igs08 1682.atx model (with spikes)
GPS-only IGS08 sites as reference
data span: April 17, 2011 – December 17, 2011 (245 days)
Liwosz and Rogowski Report of the WUT LAC
8th EPN LAC Workshop, Brussels, May 15–16
GNSS Analysis – test network
−20˚ 0˚ 20˚ 40˚
30˚
40˚
50˚
60˚
AJAC
BELF
BOR1
BORJ
BPDL
BRUS
BUCU
BUTE
BYDG
COMO
DAREDRES
DUBR
EGLT
ENIS
EUSK
FOYL
GANP
GLSV
GOPE
GWWL
HERT
HOE2
HOFN
IGMI
INVR
JOZE/2
KHAR
KLOP
KURE
LAMA
LODZ
MAN2
MARS
MATE
METS
NOT1
ONSA
PENC
POLV
POUS
REDZ
REYK
SASS
SKE0
SMLA
SVTL
SWKI
TORI
USDL
VEN1
VILL
WROC
WSRT
WTZRZIMM
ZYWI
Orange: GNSS site; Grey: GPS-only reference site
Liwosz and Rogowski Report of the WUT LAC
8th EPN LAC Workshop, Brussels, May 15–16
GNSS Analysis – examples of coordinate differences
−3
−2
−1
0
1
2
3
No
rth
(m
m)
GNSSPCV−GNSS
−3
−2
−1
0
1
2
3
Ea
st
(mm
)
−9
−6
−3
0
3
6
9
Up
(m
m)
1640 1650 1660
GPS week
−3
−2
−1
0
1
2
3
No
rth
(m
m)
GNSSPCV−GNSS
−3
−2
−1
0
1
2
3
Ea
st
(mm
)
−9
−6
−3
0
3
6
9
Up
(m
m)
1640 1650 1660
GPS week
−3
−2
−1
0
1
2
3
No
rth
(m
m)
GNSSPCV−GNSS
−3
−2
−1
0
1
2
3
Ea
st
(mm
)
−9
−6
−3
0
3
6
9
Up
(m
m)
1640 1650 1660
GPS week
DARE WTZR DRES
Liwosz and Rogowski Report of the WUT LAC
8th EPN LAC Workshop, Brussels, May 15–16
GNSS analysis – comparison
Mean differences over 245 days between GNSS solution andGNSSPCV solution and their standard deviations.
−2
−1
0
1
2
Nort
h (
mm
)
−2
−1
0
1
2
East (m
m)
−4
−2
0
2
4
Up (
mm
)
DARE
INVR
BORJ
DRES
HOE2
WTZR
TORI
BELF
BUCU
EGLT
ENIS
EUSK
FOYL
KURE
LAMA
MARS
PENC
WROC
AJAC
HERT
JOZ2
MAN2
MATE
VEN1
GLSV
KHAR
SMLA
COMO
HOFN
POUS
SASS
GOPE
IGMI
REYK
SVTL
DUBR
GANP
BPDL
BUTE
BYDG
GWWL
KLOP
LODZ
REDZ
SWKI
USDL
ZYWI
LEIAR25_LEIT
LEIAR25.R3_LEIT
LEIAR25.R3_NONE
LEIAT504GG_LEIS
LEIAT504GG_NONE
NOV702GG_NONE
TPSCR3_GGD_CONE
TPSCR.G3_TPSH
TRM55971.00_NONE
TRM55971.00_TZGD
Liwosz and Rogowski Report of the WUT LAC
8th EPN LAC Workshop, Brussels, May 15–16
GNSS analysis cont.
After introducing receiver GLONASS-specific PCVs in our GNSSanalysis:
no repeatability change of station positions
in general solutions did not get closer to GPS-only solutions
better correlation between height change and ZTD changewrt. GPS-only solution:
−6
−4
−2
0
2
4
6
∆ZT
D (
mm
)
−6 −4 −2 0 2 4 6
∆Height (mm)
GPS minus GNSS
R=−0.74
(a)
−6
−4
−2
0
2
4
6
∆ZT
D (
mm
)
−6 −4 −2 0 2 4 6
∆Height (mm)
GPS minus GNSSPCV
R=−0.88
(b)
Difference of correlation coefficients (R) significant (p < 0.05)
Liwosz and Rogowski Report of the WUT LAC
8th EPN LAC Workshop, Brussels, May 15–16
GNSS Analysis – difference of coordinates: REYK
−6
−4
−2
0
2
4
6
No
rth
(m
m)
GPS−GNSS
−6
−4
−2
0
2
4
6
GPS−GNSSPCV
−6
−4
−2
0
2
4
6
GNSSPCV−GNSS
−6
−4
−2
0
2
4
6
Ea
st
(mm
)
−6
−4
−2
0
2
4
6
−6
−4
−2
0
2
4
6
−12
−8
−4
0
4
8
12
Up
(m
m)
1640 1650 1660
GPS week
−12
−8
−4
0
4
8
12
1640 1650 1660
GPS week
−12
−8
−4
0
4
8
12
1640 1650 1660
GPS week
Liwosz and Rogowski Report of the WUT LAC
8th EPN LAC Workshop, Brussels, May 15–16
Outlook
Currently WUT contributes to the EPN with final and rapidproducts:
plans to prepare and submit NRT results
WUT can participate in repro2
We could possibly generate solutions with global sites (initialanalysis already done)we would use the new version of Bernese GNSS Software (5.2)for GNSS data analysis for EUREF
software available at WUT (∼2 weeks); no tests performed sofar
Liwosz and Rogowski Report of the WUT LAC