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IGS 39th Governing Board Meeting Activities Summary

This report outlines the key activities and advancements discussed and planned during the IGS 39th Governing Board Meeting in San Francisco on December 3, 2011. The document covers various topics such as finalizing the IGS08 core network, re-combination of AC solutions, maintenance tasks for IGS08, ongoing calibration campaigns, and future plans for enhancing the IGS network for navigation and geophysical studies. It also highlights the REGINA project's contributions to the IGS reference frame and network.

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IGS 39th Governing Board Meeting Activities Summary

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  1. RFWG report______________________IGS 39th GoverningBoard MeetingSan Francisco, 3 December 2011

  2. Activities in 2011 • Finalization of IGS08/igs08.atx • Station selectionfrom ITRF2008 • Corrections to account for igs05.atx→igs08.atx calibration changes • Determination of new satellite z-PCOs • Definition of the IGS08 core network • Documentation / help • IGS Mails 6354, 6355, 6356 • Rebischung et al., IGS08: Elaboration, consequences and maintenance of the IGS realization of ITRF2008, EGU 2011 • Rebischung et al., IGS08: the IGS realization of ITRF2008, GPS Solutions, in press • Transition on April, 17th • Rotationalinstabilitiesreduced for someACs

  3. Activities in 2011 • ‘igb’ re-combination of repro1+operational AC solutions • Homogeneous set of weekly solutions (1994.0 – 2011.3) • igbproductsused in severalstudies (see AGU talks of Collilieux et al. andRay et al.) • New IGS cumulative solution! • Based on the homogeneousigbdataset • New list of discontinuities • Introduction of velocityconstraints • Otherimprovements: • Check of AC metadata vs. site logs • IGS08 core network used to alignweekly solutions

  4. Activities in 2011 • Monitoring the SINEX combinationresults: RMS of the AC-igsresiduals Switch toIGS08/igs08.atx ESA introducestropo gradients GRG introducestropo gradients JPL: antenna-dependent (or station-dependent?) biases in East

  5. Ongoingactivities • IGS08 maintenance: • « Repair » discontinuities by introducing post-jumpcoordinates • Replace dormant/decommissioned stations by co-located stations • Solve the JPSREGANT problem (with AWG) • A mean calibration isused for twoantennasub-types. • Identifywhichsub-type isinstalledatwhich station • Correct site logs • Also correct IGS08 and IGS cumulative solution • « IGb08 » published in early 2012?

  6. Ongoingactivities • Uncalibrated radome campaign • 3 experimentsso far: CRO1, TSKB and TSK2 • 2 PPP time seriesanalyzed (Bernese & Gipsy) • Difficulties to getaccurateestimates of the radome effects • Strong post-seismic relaxation at TSKB and TSK2 • Seasonal motions • Nextsteps: • Third PPP series (Napeos) • Removeloading model • Furtherexperiments

  7. Ongoingactivities • Enhancement of the IGS network: • 65 SIRGAS stations proposed • 34 advised to ACs • Formalintegrationprocess to bedoneby station operators • Contacts with APREF and AFREF

  8. Ongoingactivities • SINEX combinationwebsite • Maps API • Time seriesvisualizationtools • Webservices • Provisionaladdress: http://webigs.ign.fr/en(login: external; pwd: welcome) • Publiclyavailablearound March 2012

  9. Other plans for 2012 • Repro2: FinalizepreparationwithACs + Combination • Change from 7-d to 1-d sampling • Include satellite PCOs in SINEX combinations • Evaluate the accuracy of the igs08.atx values • DerivePCOs for newlylaunched satellites • GNSS couldcontribute to the scale rate of the next ITRF. • New productsneeded? • Weekly solutions aligned in orientation only to IGS08(more suited for geophysicalstudies) • Invertedgeocenter time series

  10. REGINA project « RéseauGnss pour l’IGS et la Navigation » GNSS network for IGS and Navigation 3 December 2011 REGINA presentation - IGS 39th GB Meeting 10

  11. GNSS context 3 December 2011 REGINA presentation - IGS 39th GB Meeting 11

  12. REGINA objectives 3 December 2011 REGINA presentation - IGS 39th GB Meeting 12

  13. REGINA stations 3 December 2011 REGINA presentation - IGS 39th GB Meeting 13

  14. REGINA network Preliminary coverage design 3 December 2011 REGINA presentation - IGS 39th GB Meeting 14

  15. REGINA network Existing, upgraded stations 3 December 2011 REGINA presentation - IGS 39th GB Meeting 15

  16. REGINA network Current IGS reference frame stations 3 December 2011 REGINA presentation - IGS 39th GB Meeting 16

  17. REGINA data centers 3 December 2011 REGINA presentation - IGS 39th GB Meeting 17

  18. Contribution to the IGS 3 December 2011 REGINA presentation - IGS 39th GB Meeting 18

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