Esoc combined gnss processing
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ESOC Combined GNSS Processing. T. Springer , F. Dilssner, E. Schoenemann, I. Romero, J. Tegedor, F. Pereira, J. Dow. IGS = International GNSS Service => not only GPS! Called GNSS Service since 2005! …but…IGS network is far from being a GNSS tracking network!

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ESOC Combined GNSS Processing

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Esoc combined gnss processing

ESOC Combined GNSS Processing

T. Springer, F. Dilssner, E. Schoenemann,

I. Romero, J. Tegedor, F. Pereira, J. Dow


Motivation

IGS = International GNSS Service => not only GPS!

Called GNSS Service since 2005!

…but…IGS network is far from being a GNSS tracking network!

GLONASS is going towards full constellation by 2009

End of 2008 possibly 22 satellites

Galileo is coming!

First two test satellites are flying (GIOVE-A and GIOVE-B)

Global tacking network available (13 GESS)

New and better signals!

Compass developments!?

Additional GPS satellite provide some benefits

Additional other GNSS satellites with different orbit characteristics' may provide even more benefits (ERPs, Geocenter, yearly “signals”)

but biases between different GNSS systems may obscure the potential benefits

Motivation


Esoc combined gnss processing

Giove-A versus GPS Signal Quality


Gess giove tracking network

GESS (GIOVE) Tracking Network


Igs gnss tracking network

IGS GNSS Tracking Network

Almost no US nor Canadian GNSS Stations!


Pseudo graphics of gnss tracking

G17 |************************************************************************

G12 |************************************************************************

G15 |************************************************************************

G29 |************************************************************************

G07 |************************************************************************

----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|--

Pseudo Graphics of GNSS Tracking

R04 |2345444444444449*******************65788887998778989**77********96556465

R06 |***976456666799998666655777******************34445768889999*************

R08 |*************9*-9**889*888887744344568*-************9545544456788858****

R10 |998878**************95553355677554555455*******************7568*98889*98

R11 |22334444557788*********9--21122433333233333667******************6332333-

R13 |*****554433343455559************---4332223343333233-55-689**************

R14 |********754555445546668*******************988898*9999665565669**********

R15 |7**********7763333322332236***************98885553343333333422124459****

R17 |565-*****************-2222323333-467779********95------333333233333668*-

R19 |9*999855466669***************6666455667**96*************88*98897799*9998

R20 |788**99999999422579*************765555445546668*******************9889*9

R23 |************566998879**88889*************976676765554445666*************

R24 |*****************5544788999878**************965433556887555555558*******

----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|--

E01 |-344444444433-222--33344555555555665533344433333334444456666566666667776

E16 |344455556655555666665444445443224444444445555544456777555554344335555554

----|----|----|----|----|----|----|----|----|----|----|----|----|----|----|--

Timestep per interval (sec) : 1200


Esoc combined gnss processing

Giove-A versus GPS Orbit Quality

IGS 2-day Orbit Overlap RMS = 11 mm

Glonass 2-day Orbit Overlap RMS = 173 mm


Esoc combined gnss processing

Giove-A: Receiver Intersystem Bias

Orbit Quality surprisingly good given the poor quality of the tracking network!


Bahn intersystem bias estimation r04

BAHN Intersystem Bias estimation – R04

TRIMBLE

LEICA

JPS

TPS


Conclusions

The IGS is currently mainly a GPS-only service!

No reasonable GNSS tracking network

No GNSS product with “IGS label”

But…two ACs (CODE and ESOC) provide true combined GNSS solutions

Several formats do (still) not cater for GLONASS let alone GALILEO, especially in the real time area!

To become a true GNSS service IGS will have to:

Enforce that all (new) IGS stations are GNSS stations

Start generating a true GNSS combined product (orbit and clock)

Ensure that all formats are GNSS capable

Should start ASAP!

Significant interest and demand exists for GNSS products!

Conclusions

To GPS or to GNSS that is the question!


Thank you

Thank You!


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