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

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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