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AIUB - Swiss Institute Of Navigation :: ION-CH

Moving from GPS to multi-GNSS:

challenges for users, applications, and

software

R. Dach,

H. Bock, A. Jäggi, S. Lutz, U. Meyer, M. Meindl, L. Ostini, L. Prange,

S. Schaer a , A. Steinbach, D. Thaller, P. Walser, G. Beutler

rolf.dach@aiub.unibe.ch

Astronomisches Institut, Universität Bern, Sidlerstrasse 5, CH-3012 Bern

a Bundesamt für Landestopographie swisstopo, Seftigenstrasse 264, CH-3084 Wabern

Navigare’09; Neuchâtel; 17. June 2009


Outline

Galileo est dans l’air. . .

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 2/23


Outline

Galileo est dans l’air. . .

■ Review the current situation: GPS and GLONASS

GPS-only or combination of GPS/GLONASS

What needs to be considered Where are the limitations

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 2/23


Outline

Galileo est dans l’air. . .

■ Review the current situation: GPS and GLONASS

GPS-only or combination of GPS/GLONASS

What needs to be considered Where are the limitations

■ What we can expect in the future

moderization of GPS and GLONASS, more GNSS.

What does it mean for the hardware, software and the users

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 2/23


Outline

Galileo est dans l’air. . .

■ Review the current situation: GPS and GLONASS

GPS-only or combination of GPS/GLONASS

What needs to be considered Where are the limitations

■ What we can expect in the future

moderization of GPS and GLONASS, more GNSS.

What does it mean for the hardware, software and the users

■ What benefit can we expect from additional GNSS

■ Why not clone existing satellites in different MEO–orbits

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 2/23


Outline

Galileo est dans l’air. . .

■ Review the current situation: GPS and GLONASS

GPS-only or combination of GPS/GLONASS

What needs to be considered Where are the limitations

■ What we can expect in the future

moderization of GPS and GLONASS, more GNSS.

What does it mean for the hardware, software and the users

■ What benefit can we expect from additional GNSS

■ Why not clone existing satellites in different MEO–orbits

Moving from GPS to multi–GNSS:

challenges for users, applications, and software

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 2/23


GNSS: Current Situation

GPS: Global Positioning System

360

26

15

13

23

14

315

22

18

10

20

32

■ The current GPS constellation consists of

31 active satellites from four different

types.

Ascending Node in deg.

270

225

180

135

90

28

19

21 24

3 6 16

29

2

4

30 1

12 5

17

11

■ Available observations:

45

8

7

25

31

9

27

◆ code measurements (P1, P2, C1, C2 ∗ )

◆ dual frequency carrier phase:

L1C, L1P, L1N as well as

L2C, L2D, L2S, L2L, L2X, L2P, L2N

0

0 45 90 135 180 225 270 315 360

Argument of Latitude in deg.

GPS constellation

BLOCK IIA BLOCK IIR−A BLOCK IIR−B BLOCK IIR−M

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 3/23


GNSS: Current Situation

GPS: Global Positioning System

360

26

15

13

23

14

315

22

18

10

20

32

■ The current GPS constellation consists of

31 active satellites from four different

types.

Ascending Node in deg.

270

225

180

135

90

28

19

21 24

3 6 16

29

2

4

30 1

12 5

17

11

■ Available observations:

45

8

7

25

31

9

27

◆ code measurements (P1, P2, C1, C2 ∗ )

◆ dual frequency carrier phase:

L1C, L1P, L1N as well as

L2C, L2D, L2S, L2L, L2X, L2P, L2N

0

0 45 90 135 180 225 270 315 360

Argument of Latitude in deg.

GPS constellation

BLOCK IIA BLOCK IIR−A BLOCK IIR−B BLOCK IIR−M

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 3/23


GNSS: Current Situation

GPS: Global Positioning System

360

26

15

13

23

14

■ The current GPS constellation consists of

31 active satellites from four different

types.

■ Resulting biases:

◆ P1−C1, P2−C2 ∗

◆ P1−P2, C1−C2 ∗

◆ quarter cycle between L2P and L2C

Ascending Node in deg.

315

270

225

180

135

90

45

0

22

28

18

19

21 24

3 6

8

7

10

25

16

29

20

32

0 45 90 135 180 225 270 315 360

Argument of Latitude in deg.

GPS constellation

BLOCK IIA BLOCK IIR−A BLOCK IIR−B BLOCK IIR−M

2

4

31

30 1 12 5

17

11

9

27

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 3/23


GLONASS:ÐÓÐÒÒÚÓÒÒ×ÔÙØÒÓÚ××ØÑ

GNSS: Current Situation

360

◆■ The current GLONASS constellation

consists of 19 active satellites of the

latest type.

■ Available observations:

◆ code measurements (P1, P2, C1, C2)

◆ dual frequency carrier phase:

L1C, L1P, L2C, L2P

◆ each satellites uses its own frequency

Ascending Node in deg.

315

270

225

180

135

90

45

0

6/1

22/−3

21/4

20/2

3/5

2/1

19/3

14/−7 13/−2 11/0

18/−3

10/−7

0 45 90 135 180 225 270 315 360

Argument of Latitude in deg.

GLONASS constellation

GLONASS−M

8/6

17/4

24/2

7/5

23/3

15/0

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 4/23


GLONASS:ÐÓÐÒÒÚÓÒÒ×ÔÙØÒÓÚ××ØÑ

GNSS: Current Situation

360

■ The current GLONASS constellation

consists of 19 active satellites of the

latest type.

■ Available observations:

◆ code measurements (P1, P2, C1, C2)

◆ dual frequency carrier phase:

L1C, L1P, L2C, L2P

◆ each satellites uses its own frequency

Ascending Node in deg.

315

270

225

180

135

90

45

0

6/1

22/−3

21/4

20/2

3/5

2/1

19/3

14/−7 13/−2 11/0

18/−3

10/−7

0 45 90 135 180 225 270 315 360

Argument of Latitude in deg.

GLONASS constellation

GLONASS−M

8/6

17/4

24/2

7/5

23/3

15/0

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 4/23


GLONASS:ÐÓÐÒÒÚÓÒÒ×ÔÙØÒÓÚ××ØÑ

GNSS: Current Situation

360

■ The current GLONASS constellation

consists of 19 active satellites of the

latest type.

■ Resulting biases:

◆ P1−C1, P2−C2

◆ P1−P2, C1−C2

◆ interfrequency-biases

Ascending Node in deg.

315

270

225

180

135

90

45

0

6/1

22/−3

21/4

20/2

3/5

2/1

19/3

14/−7 13/−2 11/0

18/−3

10/−7

0 45 90 135 180 225 270 315 360

Argument of Latitude in deg.

GLONASS constellation

GLONASS−M

8/6

17/4

24/2

7/5

23/3

15/0

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 4/23


GNSS: Current Situation

Combination of GPS and GLONASS

◆■ Two dual–frequency system are today available.

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 5/23


GNSS: Current Situation

Combination of GPS and GLONASS

■ Two dual–frequency system are today available.

■ GLONASS can be considered as GPS with satellite–specific frequencies.

■ Considering a (constant) inter–system receiver bias the data from both

systems can be processed together in a rigorous combined analysis.

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 5/23


GNSS: Current Situation

Combination of GPS and GLONASS

■ Two dual–frequency system are today available.

■ GLONASS can be considered as GPS with satellite–specific frequencies.

■ Considering a (constant) inter–system receiver bias the data from both

systems can be processed together in a rigorous combined analysis.

■ CODE (one of the IGS-ACs, located at AIUB) provides contributions of a fully

combined processing for GPS and GLONASS measurements since May

2003.

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 5/23


GNSS: Current Situation

Combination of GPS and GLONASS

■ Two dual–frequency system are today available.

■ GLONASS can be considered as GPS with satellite–specific frequencies.

■ Considering a (constant) inter–system receiver bias the data from both

systems can be processed together in a rigorous combined analysis.

■ CODE (one of the IGS-ACs, located at AIUB) provides contributions of a fully

combined processing for GPS and GLONASS measurements since May

2003.

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 5/23


Clock differences in ps

100

80

60

40

20

0

−20

−40

−60

−80

−100

Receiver Intersystem Biases

Receiver clock differences between ZIM2 and ZIMJ

TRIMBLE NETR5 and JPS LEGACY

Difference between L1 (GPS) and L1 (GLO)

0 4 8 12 16 20 24

Hours for day 161 fo 2009

20

10

0

−10

−20

Clock differences in mm

phase–only zero–difference network solutions

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 6/23


Clock differences in ps

100

80

60

40

20

0

−20

−40

−60

−80

−100

Receiver Intersystem Biases

Receiver clock differences between ZIM2 and ZIMJ

TRIMBLE NETR5 and JPS LEGACY

Difference between L2 (GPS) and L2 (GLO)

0 4 8 12 16 20 24

Hours for day 161 fo 2009

20

10

0

−10

−20

Clock differences in mm

phase–only zero–difference network solutions

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 6/23


Clock differences in ps

100

80

60

40

20

0

−20

−40

−60

−80

−100

Receiver Intersystem Biases

Receiver clock differences between ZIM2 and ZIMJ

TRIMBLE NETR5 and JPS LEGACY

Difference between L1 (GPS) and L2 (GPS)

0 4 8 12 16 20 24

Hours for day 161 fo 2009

20

10

0

−10

−20

Clock differences in mm

phase–only zero–difference network solutions

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 6/23


Clock differences in ps

100

80

60

40

20

0

−20

−40

−60

−80

−100

Receiver Intersystem Biases

Receiver clock differences between ZIM2 and ZIMJ

TRIMBLE NETR5 and JPS LEGACY

Difference between L1 (GLO) and L2 (GLO)

0 4 8 12 16 20 24

Hours for day 161 fo 2009

20

10

0

−10

−20

Clock differences in mm

phase–only zero–difference network solutions

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 6/23


Receiver Intersystem Biases

Receiver clock differences between ZIM2 and ZIMJ

TRIMBLE NETR5 and JPS LEGACY

Clock differences in ps

200

180

160

140

120

100

80

60

40

20

0

−20

−40

−60

−80

−100

−120

−140

−160

−180

−200

Difference between L3 (GPS) and L3 (GLO)

0 4 8 12 16 20 24

Hours for day 161 fo 2009

50

40

30

20

10

0

−10

−20

−30

−40

−50

Clock differences in mm

phase–only zero–difference network solutions

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 6/23


Clock differences in ps

100

80

60

40

20

0

−20

−40

−60

−80

−100

Receiver Intersystem Biases

Receiver clock differences between ZIM2 and ZIMJ

TRIMBLE NETR5 and JPS LEGACY

Difference between L1 (GPS+GLO) and L2 (GPS+GLO)

0 4 8 12 16 20 24

Hours for day 161 fo 2009

20

10

0

−10

−20

Clock differences in mm

phase–only zero–difference network solutions

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 6/23


Clock differences in ps

100

80

60

40

20

0

−20

−40

−60

−80

−100

Receiver Intersystem Biases

Receiver clock differences between ZIM2 and ZIMM

TRIMBLE NETR5 and TRIMBLE NETRS

Difference between L1 (GPS) and L2 (GPS)

0 4 8 12 16 20 24

Hours for day 161 fo 2009

20

10

0

−10

−20

Clock differences in mm

phase–only zero–difference network solutions

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 7/23


Clock differences in ps

100

80

60

40

20

0

−20

−40

−60

−80

−100

Receiver Intersystem Biases

Receiver clock differences between UNB3 and UNBN

TRIMBLE NETR5 and NOV OEMV3, antenna sharing

Difference between L1 (GPS) and L1 (GLO)

0 4 8 12 16 20 24

Hours for day 161 fo 2009

20

10

0

−10

−20

Clock differences in mm

phase–only zero–difference network solutions

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 8/23


Clock differences in ps

100

80

60

40

20

0

−20

−40

−60

−80

−100

Receiver Intersystem Biases

Receiver clock differences between UNB3 and UNBN

TRIMBLE NETR5 and NOV OEMV3, antenna sharing

Difference between L2 (GPS) and L2 (GLO)

0 4 8 12 16 20 24

Hours for day 161 fo 2009

20

10

0

−10

−20

Clock differences in mm

phase–only zero–difference network solutions

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 8/23


Clock differences in ps

100

80

60

40

20

0

−20

−40

−60

−80

−100

Receiver Intersystem Biases

Receiver clock differences between UNB3 and UNBN

TRIMBLE NETR5 and NOV OEMV3, antenna sharing

Difference between L1 (GPS) and L2 (GPS)

0 4 8 12 16 20 24

Hours for day 161 fo 2009

20

10

0

−10

−20

Clock differences in mm

phase–only zero–difference network solutions

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 8/23


Clock differences in ps

100

80

60

40

20

0

−20

−40

−60

−80

−100

Receiver Intersystem Biases

Receiver clock differences between UNB3 and UNBN

TRIMBLE NETR5 and NOV OEMV3, antenna sharing

Difference between L1 (GLO) and L2 (GLO)

0 4 8 12 16 20 24

Hours for day 161 fo 2009

20

10

0

−10

−20

Clock differences in mm

phase–only zero–difference network solutions

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 8/23


GNSS: Expected Developments

What will be the future

■ GPS: Third frequency

G01 (launch March 2009) has a demonstration signal for L5.

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 9/23


GNSS: Expected Developments

What will be the future

■ GPS: Third frequency

G01 (launch March 2009) has a demonstration signal for L5.

■ GLONASS: Third frequency, CDMA in addition to FDMA

The first GLONASS–K lauch is scheduled for 2010.

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 9/23


GNSS: Expected Developments

What will be the future

■ GPS: Third frequency

G01 (launch March 2009) has a demonstration signal for L5.

■ GLONASS: Third frequency, CDMA in addition to FDMA

The first GLONASS–K lauch is scheduled for 2010.

■ Galileo: Additional GNSS

Currently two GIOVE satellites are in space

Five frequencies, with particially restricted access to the code measurements

What about the phase measurements

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 9/23


GNSS: Expected Developments

What will be the future

■ GPS: Third frequency

G01 (launch March 2009) has a demonstration signal for L5.

■ GLONASS: Third frequency, CDMA in addition to FDMA

The first GLONASS–K lauch is scheduled for 2010.

■ Galileo: Additional GNSS

Currently two GIOVE satellites are in space

Five frequencies, with particially restricted access to the code measurements

What about the phase measurements

■ Compass/Bejdou: Additional GNSS

First satellites are in space, too. . .

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 9/23


GNSS: Expected Developments

In future multi–GNSS receivers will provide a certain set of

measurements from several systems.

What to do with these measurements in the processing

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 10/23


GNSS: Expected Developments

In future multi–GNSS receivers will provide a certain set of

measurements from several systems.

What to do with these measurements in the processing

How to form an ionosphere–free LC the future

■ pre–select two frequencies per GNSS

■ pre–select two frequencies per GNSS and receiver type

■ make use of the third frequency of a subset of satellites

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 10/23


Example: Bernese GNSS Software

Flexible handling of observation types is necessary:

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 11/23


Example: Bernese GNSS Software

Flexible handling of observation types is necessary:

Core modules

User Interface

External input files

Interfaces

Processing

programs

Interfaces

External result files

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 11/23


Example: Bernese GNSS Software

Flexible handling of observation types is necessary:

■ A complex set of modern F90 modules guarantees a flexible access to the

measurements with individual linear combinations for each GNSS.

■ The use of these modules simplifies the observation handling within the

processing programs.

■ New linear combinations may be easily implemented at one place for the

entire software package.

■ Consequences for several internal files for observations, residuals, DCBs,

GNSS–specific PCV corrections, . . .

■ Consequences for external files formats: RINEX, ANTEX, SINEX, SP3c, . . .

⇒ M. Meindl et al., Developing a Generic Multi–GNSS Software Package,

IGS Workshop, Miami, June 2008.

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 11/23


GNSS: Developments and Benefit

■ More observation types, more GNSS:

The world of GNSS will become more colors —

the future seems to become much more complicate.

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 12/23


GNSS: Developments and Benefit

■ More observation types, more GNSS:

The world of GNSS will become more colors —

the future seems to become much more complicate.

Do we benefit from additional GNSS satelites

■ Test case:

combination of GPS and GLONASS observations for a kinematic positioning

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 12/23


Performance of a Kinematic Positioning

CODE EPN network

Receivers tracking: GPS/GLONASS (24) only GPS (29)

CODE EPN solution for day of year 2007:034 to 089

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 13/23


Performance of a Kinematic Positioning

Results from a kinematic positioning

Example: station Zimmerwald (ZIM2)

Kinematic positions in mm

30

0

−30

30

0

−30

30

0

−30

North

East

Up

40 50 60 70 80

Day of year 2008

GNSS

GPS

CODE EPN solution for day of year 2007:034 to 089

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 14/23


Performance of a Kinematic Positioning

Allan deviation from a kinematic positioning

Example: station Zimmerwald (ZIM2)

Up component

■ The Allan deviation reflects the

noise behavior of a time series.

■ It is comparable with the RMS of

epoch differences.

■ The time interval gives the length

between these epochs.

Allan deviation in mm/s

0.08

0.07

0.06

0.05

0.04

0.03

0.02

GNSS

GPS

0.01

0.00

0.1 1 10

Time interval in h

CODE EPN solution for day of year 2007:034 to 089

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 15/23


Performance of a Kinematic Positioning

Allan deviation from a kinematic positioning

Example: station Zimmerwald (ZIM2)

North component

East component

0.05

GNSS

GPS

0.05

GNSS

GPS

0.04

0.04

Allan deviation in mm/s

0.03

0.02

Allan deviation in mm/s

0.03

0.02

0.01

0.01

0.00

0.1 1 10

0.00

0.1 1 10

Time interval in h

Time interval in h

CODE EPN solution for day of year 2007:034 to 089

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 15/23


PDOP: Constellation Effects

Number of Satellites in View

Example: station Zimmerwald

20

Number of satellites

15

10

5

0

GNSS GPS GLONASS

60 61 62 63 64 65 66 67 68 69 70

Days of year 2008

elevation cut–off 5 ◦ , day of year 2008:060 to 069

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 16/23


PDOP: Constellation Effects

PDOP values for satellite constellation in view

Example: station Zimmerwald

4

3

PDOP

2

1

0

GNSS GPS GLONASS

60 61 62 63 64 65 66 67 68 69 70

Days of year 2008

elevation cut–off 5 ◦ , day of year 2008:060 to 069

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 16/23


PDOP: Constellation Effects

Spectra of PDOP values for satellite constellations

Example: station Zimmerwald

2.5

GPS

GNSS

amplitude(PDOP)

2.0

1.5

1.0

0.5

0.0

0.02 0.05 0.1 0.2 0.5 1 2 5 10

Days

elevation cut–off 5 ◦ , day of year 2008:020 to 069

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 17/23


PDOP: Constellation Effects

Spectra of PDOP values for satellite constellations

Example: station Zimmerwald

2.5

GPS

GNSS

power(PDOP)

2.0

1.5

1.0

0.5

0.0

0.02 0.05 0.1 0.2 0.5 1 2 5 10

Days

elevation cut–off 5 ◦ , day of year 2008:020 to 069

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 17/23


PDOP: Constellation Effects

Spectra of PDOP values for satellite constellations

Example: station Zimmerwald

2.5

GPS

GNSS

power(PDOP)

2.0

1.5

1.0

0.5

0.0

0.02 0.05 0.1 0.2 0.5 1 2 5 10

Days

elevation cut–off 5 ◦ , day of year 2008:020 to 069

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 17/23


AIUB: One of the GGSP–Partners

GGSP: Galileo Geodetic Service Provider Prototype

■ Purpose: Generation and Maintenance of the geodetic basement for Galileo

coordinates of GESS/GSS in the GTRF as a special realization of the ITRF

■ „Mini–IGS“ of the European analysis centers:

AIUB

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 18/23


AIUB: One of the GGSP–Partners

GGSP: Galileo Geodetic Service Provider Prototype

Network of GTRF–stations

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 19/23


AIUB: One of the GGSP–Partners

GGSP: Galileo Geodetic Service Provider Prototype

List of products provided by the GGSP:

corresponds to the IGS final products series

■ GTRF: coordinates and velocities of the GESS/GSS

■ high precision GNSS satellite orbits

■ Earth rotation parameters

■ satellite and receiver clock corrections

Söhne, Dach, Springer, Gendt, Altamimi, and GGSP Prototype Team: Galileo Terrestrial Reference Frame and beyond: the GGSP project. EGU, Vienna, 2009.

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 20/23


AIUB: One of the GGSP–Partners

GGSP: Galileo Geodetic Service Provider Prototype

Within the GGSP also GIOVE data have been processed.

Performance of the GIOVE satellite clocks

Söhne, Dach, Springer, Gendt, Altamimi, and GGSP Prototype Team: Galileo Terrestrial Reference Frame and beyond: the GGSP project. EGU, Vienna, 2009.

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 21/23


AIUB: One of the GGSP–Partners

GGSP: Galileo Geodetic Service Provider Prototype

Within the GGSP also GIOVE data have been processed.

Performance of the GIOVE satellite clocks

Söhne, Dach, Springer, Gendt, Altamimi, and GGSP Prototype Team: Galileo Terrestrial Reference Frame and beyond: the GGSP project. EGU, Vienna, 2009.

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 21/23


AIUB: One of the GGSP–Partners

GGSP: Galileo Geodetic Service Provider Prototype

Within the GGSP also GIOVE data have been processed.

Performance of the GIOVE satellite clocks

Söhne, Dach, Springer, Gendt, Altamimi, and GGSP Prototype Team: Galileo Terrestrial Reference Frame and beyond: the GGSP project. EGU, Vienna, 2009.

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 21/23


AIUB: One of the GGSP–Partners

GGSP: Galileo Geodetic Service Provider Prototype

Within the GGSP also GIOVE data have been processed.

Performance of the GIOVE satellite clocks

Allan deviation σ(τ) in s/s

1e−11

1e−12

1e−13

1e−14

Ref: BRUS

10 100 1000

Time interval τ in s

Söhne, Dach, Springer, Gendt, Altamimi, and GGSP Prototype Team: Galileo Terrestrial Reference Frame and beyond: the GGSP project. EGU, Vienna, 2009.

G17

G28

G29

E01

E16

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 21/23


Summary

■ Today we have two dual–frequency GNSS in operation.

■ In future the GNSS picture will be more colorful:

◆ modernization of the existing GNSS and new GNSS

◆ a big variability of observation types (between but even within the GNSS)

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 22/23


Summary

■ Today we have two dual–frequency GNSS in operation.

■ In future the GNSS picture will be more colorful:

◆ modernization of the existing GNSS and new GNSS

◆ a big variability of observation types (between but even within the GNSS)

■ In particular the kinematic positioning will benefit from additional satellites.

■ Systematic effects will be reduced by GNSS satellites in different

constellations.

■ The GNSS components will benefit from the competition between the

systems.

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 22/23


Moving from GPS to multi-GNSS

THANK YOU!

AIUB

Dach

et al.: Moving from GPS to multi-GNSS - p. 23/23

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