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armasuisseSwiss Federal Office of Topography swisstopo
National Report of Switzerland
E. Brockmann, D. Ineichen, M. Kistler, U. Marti, S. Schaer, A. Schlatter, B. Vogel, A. Wiget, U. Wild
2 Swiss Federal Office of Topography swisstopo
EUREF09: National Report of Switzerland
Geostation Zimmerwald
• New SLR system since more than 1 year in stable operation- more observations to the high satellites at day-time - improved precision of single shots by a factor of roughly
two (from 80 ps / 12 mm to 40 ps / 6 mm) - improved stability of the system biases
• Local Tie (Sept. 2008): SLR – ZIMM – ZIM2
ZIM2 antenna and terrestrial target
3 Swiss Federal Office of Topography swisstopo
EUREF09: National Report of Switzerland
Local tie results: ZIMM - SLR
-14.735
-14.733
-14.731
-14.729
-14.727
-14.725
-14.723
4.179 4.181 4.183 4.185 4.187 4.189 4.191
east [m]
no
rth
[m
]
1995.2
1998
2003
2008
logfile
5.768
5.769
5.770
5.771
5.772
5.773
5.774
5.775
1994 1999 2004 2009
time
hei
gh
t [m
]1995.2
1998
2003
2008
logfile
7 mm displacement 5 mm rising of GPS
horizontally vertically
(in 13 years)
Conclusion from other points: Movement of top of the 9-meter mast
4 Swiss Federal Office of Topography swisstopo
EUREF09: National Report of Switzerland
Permanent GNSS Network AGNES
• Faster CPUs for variousprocessing chains: 3-10times faster
• Snow and antenna performance tests: Zephyr – Choke-ring
Processing start at ":15"
SANB
SANT
SANB
SANT
+1h+2h+3h
5 Swiss Federal Office of Topography swisstopo
EUREF09: National Report of Switzerland
Permanent GNSS Network AGNES
• Kinematic GNSS coordinate estimation: gain of 30-40% in repeatability for GNSS choke-ring antenna
• 6 antennas purchased, calibrated and installed on most stable “class A” permanent stations May, 12-14 - e.g. ZIM2
-0.06
-0.04
-0.02
0
0.02
0.04
0.06
[m]
SANB
SANT
East
7 days (4.1.-10.1.09)
SANB: Zephyr SANT: Choke-ring
6 Swiss Federal Office of Topography swisstopo
EUREF09: National Report of Switzerland
Combined multi-annual solutions: vertical velocities
• 10 years normal equations
• Reference: min. constraint ITRF2005
• WTZR – ZIMM: 2.5 mm/yr
• +1.5 mm/yr Alpine rise from 100 years levelling
• STD to EUREF densification: 2 mm hor., 5 mm vertical
downward movementrise
1 mm/yr
7 Swiss Federal Office of Topography swisstopo
EUREF09: National Report of Switzerland
National ETRF coordinates for EPN stations• ZIMM still has exactly the original ETRF93 coordinates which were
used to define via campaigns the national reference frame CHTRF95
• Difference to EUREF densification solution
• “sequential datum definition process”: every site once used for datum definition in CHTRF95 is used reference station for the alignment additional stations using results of multi-annual solution
CHTRF95 =ETRF93, epoch 1993.0
Station X [m] Y [m] Z[m]
ZIMM 14001M004 4331297.3388 567555.6380 4633133.7174
Station
localdifference [mm]
dE dN dU
ZIMM 14001M004 310/98-365/05 0.4 0.2 12.
ZIMM 14001M004A 182/96-310/98
4.4 -0.2 -3.9