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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. 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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  1. ESOC Combined GNSS Processing T. Springer, F. Dilssner, E. Schoenemann, I. Romero, J. Tegedor, F. Pereira, J. Dow

  2. 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

  3. Giove-A versus GPS Signal Quality

  4. GESS (GIOVE) Tracking Network

  5. IGS GNSS Tracking Network Almost no US nor Canadian GNSS Stations!

  6. 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

  7. Giove-A versus GPS Orbit Quality IGS 2-day Orbit Overlap RMS = 11 mm Glonass 2-day Orbit Overlap RMS = 173 mm

  8. Giove-A: Receiver Intersystem Bias Orbit Quality surprisingly good given the poor quality of the tracking network!

  9. BAHN Intersystem Bias estimation – R04 TRIMBLE LEICA JPS TPS

  10. 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!

  11. Thank You!

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