Stability of the Swiss National Reference frame derived from … · 2019-05-15 · 2 E. Brockmann et al. Stability of the Swiss National Reference frame from GNSS analysis in Switzerland

Federal Office of Topography swisstopo

Stability of the Swiss National

Reference frame derived from GNSS

analysis in Switzerland and Europe

E. Brockmann, D. Ineichen, S. Lutz

2

E. Brockmann et al.

Stability of the Swiss National Reference frame from GNSS analysis in Switzerland and Europe

CHTRF2016: Multi-GNSS field campaign

and AGNES permanent network

• All ~200 reference points measured in summer 2016 (1988-

1995 establ., 1998, 2004, 2010 remeasured every 6 years)

• Multi-GNSS knowledge extension (permanent analysis later

because campaigns are less time-critical)

LV95; 1988-1995; passive; ~200 stations, Multi-GNSS since 2016 AGNES; 1998-2001; active; 42 stations,

Multi-GNSS since Feb-May 2015

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Multi-GNSS

GAL (Galileo): 20

GPS: 32

All available Global Navigation

Systems (# Sat in Nov. 2018)

(QZSS): 1 from EU visible

=

GLO (Glonass): 24

BDS (Beidou): 10

http://www.welt-blick.de/flagge/china.html

http://www.welt-blick.de/flagge/japan.html

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Campaign 2016

• 10 observers

• 15 weeks (Mo – Sa)

• 297 points (incl. AGNES)

• ~ 44.6 h observations / point

• 5 campaigns from Baden-

Württemberg integrated (6 h

measurements, separated in time)

• Analysis using BSW5.3

(development version)

• Analysis delay 1-2 months – CODE

Multi-GNSS orbits not operational

in 2016

01

02

03

04

05

06

07

08

09

10

11

12

13

14

15

AGNES

BW-campaigns

NaGNet

stations

297 stations

Day in year 2016

COGEAR

stations

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Reference for Multi-GNSS observations

• one MIX coordinate (+TRP): N,E,U,T

or

• per satellite system one coordinate (+TRP):

N,E,U,T | N,E,U,T | N,E,U,T | N,E,U,T

E

U

NGLO

GALBDS

GPS

T (Tropo)

4

4x4

Reference dN,dE,dU,dT | dN,dE,dU,dT | dN,dE,dU,dT

12 ISTPs

MIXNo antenna

calibrations

available for

GAL, BDS

ISTPs:

„Inter System

Translation Parameter“

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CHTRF16 hor. difference: MIX-GPS

Not significant

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CHTRF16 vertical difference: MIX-GPS

Differences up to 1 cm

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combination

1988-2018

Combination Campaigns + Perm. Net

Neo88

combination

LV95

1988-1995

24 campaigns 302

points

Neo88

time

CHTRF98

8 campaigns

293 points

LV95

Densification

combination

1995-

1998

32 sessions

132 points

EUVN 97

1 campaign

217 points

(9 CH)

CHGeoid03

CHTRF

2004

CHTRF

2010

LV

03-09

14 campaigns

15 campaigns

263 points

14 campaigns

245 points

6 campaigns

66 pointsLV

11-1515 campaigns

CHTRF

2016

15 campaigns

297 points

Not reprocessed

LV

11-15

GPS+

GLO

and

actual

models

Multi-

GNSSPartially reprocessed

AGNES+EUREF

1996.0 – 2018.5

1988 2018

Multi-

GNSSreprocessed

GPS+

GLO +

Models

GPS

Galileo

Beidou

+ Glonass +Galileo

+Beidou

based on ~6’000’000’000

Iono-free GNSS observations

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Combination types

Solution type remark

REP_CAMP CRD

REP_CAMP CRD+VEL

All campaigns starting CHTRF1998 (reprocessed; major

campaigns sub-combined)

ALL_DAY CRD

ALL_DAY CRD+VEL

All campaigns starting CHTRF1989 (1989 – 1997 sub-

combination w/o reprocessing) and all other bases on

Session solutions

---

ALL_DAY_EU CRD+VEL

All campaigns starting CHTRF1989 (1989 – 1997 sub-

combination w/o reprocessing) and all other bases on

Session solutions AND reprocessing permanent network

AGNES (CH+EU) 1996 – 2018 (DOY 153; June 2, 2018)

REP_CAMP

ALL_DAY

ALL_DAY_EU

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Repeatabilities / Statistics

REP_CAMP

ALL_DAY

185; 41%

49; 11%

216; 48%

0-4 4-8 8-16 16-26

646; 67%65; 7%

62; 6%

194; 20%

0-4 4-8 8-16 16-26

Length of time

series

Only horizontal velocities for campaigns

(too man antenna changes and too weak heights)

comment #CRD / #VEL ([%]) sN [mm] sE [mm] sU [mm] # Session Files

CRD 450 / 0 (0%) 2.1 1.8 6.7 1718

CRD+VEL 450 / 223 (50%) 1.4 1.1 6.7 1718

improvement [%] 31.7 36.7 0.4


CRD 967 / 0 (0%) 2.2 1.6 5.4 16538

CRD+VEL 967 / 310 (33%) 1.7 1.4 5.3 16538

improvement [%] 23.1 14.1 0.7


CRD+VEL 1350 / 447 (33%) 1.5 1.4 5.0 1021563

ALL_DAY_EU

Based on ~6’000’000’000

Iono-free GNSS observations

(every 3 minutes)

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Example

Zervreilasee REP_CAMP

ALL_DAY

ALL_DAY_EU

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Example Zervreilasee (2)

04.12.20

Multi-GNSSGPS

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Velocity Fields ALL_DAY_EU

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Velocity Fields ALL_DAY_EU

w.r.t Zimmerwald

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Velocity Fields Vertically ALL_DAY_EU

only test

purposecampaign stations:

also vertical velocities

(TEST)

w.r.t Eurasian plate

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Publication on pnac webhttp://pnac.swisstopo.admin.ch/pages/en/chtrf.html

http://pnac.swisstopo.admin.ch/pages/en/chtrf.html

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Publication on pnac web (2)

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Correlation with Geology / Seismic

Geological information from Swiss Seismological Sercice (T. Diehl)

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EU Dense Velocities

• EUREF WG chaired by E. Brockmann since 2017

• 24 contributions

• 3-D GNSS-fields, grids, INSAR/Levelling velocities, levelling

velocities, …

• 1987 sites in > 2

solutions

• ZIMM in 16 contributions

• Standard deviation

~0.2-0.3 mm/yr hor.

~0.4-0.7 mm/yr up

• Velocity field total

(w/o grids) ~5000 sites

Status Oct. 5, 2018

http://pnac.swisstopo.admin.ch/divers/dens_vel/index.html

http://pnac.swisstopo.admin.ch/divers/dens_vel/index.html

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CombinationSorted by std-North

Regions

with bigger

movements

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Including global velocities (25’000 sites)

Global info from

gsrm14 contribution:

Nevada University

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Velocity field Europe: Zoom South EU• ~5000 sites in Europe

• 3-4 mm/yr: Italy

3-4 cm/yr: Greece/Turkey

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Velocity field (~5000 sites) vertically

EuropePost-glacial rebound

Scandinavia: 1 cm / yr

Swiss Alps: 2-3 mm / yr

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Summary

• Multi-GNSS (GPS+GLO+GAL+BDS) measurements used for

reference frame maintenance (permanent network and

campaign data) since 2016

• Combination 1989 – 2018 successful

- based on partial reprocessing back to 1996

- similar field as derived 2010 (small horizontal velocities

0.2-0.3 mm/yr standard deviation to zero field)

- systematical velocities South of Rhone-Rhein: < 1 mm/yr

- AGNES Permanent network is integrated

- combination with EU velocities realized

• Data set to derive a kinematic model for Switzerland and to

analyse correlations with Geology and Seismology

Documents

Stability of the Swiss National Reference frame derived from … · 2019-05-15 · 2 E. Brockmann et al. Stability of the Swiss National Reference frame from GNSS analysis in Switzerland