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RFWG report______________________
IGS 39th Governing Board MeetingSan Francisco, 3 December 2011
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Activities in 2011
• Finalization of IGS08/igs08.atx• Station selection from 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
• Rotational instabilities reduced for some ACs
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Activities in 2011
• ‘igb’ re-combination of repro1+operational AC solutions• Homogeneous set of weekly solutions (1994.0 – 2011.3)• igb products used in several studies (see AGU talks of Collilieux et al. and
Ray et al.)
• New IGS cumulative solution!• Based on the homogeneous igb dataset• New list of discontinuities• Introduction of velocity constraints
• Other improvements:• Check of AC metadata vs. site logs• IGS08 core network used to align weekly solutions
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Activities in 2011
• Monitoring the SINEX combination results:
RMS of the AC-igs residualsSwitch to
IGS08/igs08.atxESA introducestropo gradientsGRG introducestropo gradients
JPL: antenna-dependent (or station-dependent?)
biases in East
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Ongoing activities
• IGS08 maintenance:• « Repair » discontinuities by introducing post-jump coordinates• Replace dormant/decommissioned stations by co-located stations
• Solve the JPSREGANT problem (with AWG)• A mean calibration is used for two antenna sub-types.• Identify which sub-type is installed at which station• Correct site logs• Also correct IGS08 and IGS cumulative solution
• « IGb08 » published in early 2012?
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Ongoing activities
• Uncalibrated radome campaign• 3 experiments so far: CRO1, TSKB and TSK2• 2 PPP time series analyzed (Bernese & Gipsy)
• Difficulties to get accurate estimates of the radome effects• Strong post-seismic relaxation at TSKB and TSK2• Seasonal motions
• Next steps:• Third PPP series (Napeos)• Remove loading model• Further experiments
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Ongoing activities
• Enhancement of the IGS network:
• 65 SIRGAS stations proposed• 34 advised to ACs• Formal integration process to be done
by station operators
• Contacts with APREF and AFREF
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Ongoing activities
• SINEX combination website
• Maps API• Time series visualization tools• Webservices
• Provisional address: http://webigs.ign.fr/en(login: external; pwd: welcome)
• Publicly available around March 2012
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Other plans for 2012
• Repro2: Finalize preparation with ACs + Combination
• Change from 7-d to 1-d sampling
• Include satellite PCOs in SINEX combinations• Evaluate the accuracy of the igs08.atx values• Derive PCOs for newly launched satellites• GNSS could contribute to the scale rate of the next ITRF.
• New products needed?• Weekly solutions aligned in orientation only to IGS08
(more suited for geophysical studies)• Inverted geocenter time series
REGINA project
3 December 2011 REGINA presentation - IGS 39th GB Meeting 10
« Réseau Gnss pour l’IGS et la Navigation »GNSS network for IGS and Navigation
GNSS context
Improvements of existing systems
• New GPS signals (L2C, L5)• GLONASS now operational and being improved
New systems
• Galileo: 2 satellites launched• Asian systems: COMPASS, QZSS
Real-time
• Precise Point Positioning
3 December 2011 REGINA presentation - IGS 39th GB Meeting 11
REGINA objectives
Global multi-GNSS real-time network
• Upgrade CNES and IGN existing stations• Install new stations → global worldwide network of 30 stations• Real-time diffusion of multi-GNSS data (especially Galileo)
Positioning
• Real-time determination and diffusion of orbits and clocks
Contributions to
• IGS• EUREF• ITRF (co-locations with DORIS; local ties)
3 December 2011 REGINA presentation - IGS 39th GB Meeting 12
REGINA stations
Antenna site
• Stable mount (ground or building)• Distance from DORIS antenna: 5 m to 1 km (<100 m preferred)• No masks above 15°• Existing shelter for receiver housing, or possibility to build one• At least 1 km away from powerful microwave sources• Long-term secured location (no planned constructions, demolitions…)
Receiver housing
• Restricted access• Standard 110 or 220 VAC power supply• Internet line tap• Sheath inlet for REGINA antenna cable
Signals tracked
• GPS L1/L2/L2C/L5• GLONASS L1/L2• GIOVE-GALILEO E5a/E5b/AltBocE5, E1BC• SBAS L1/L5• Waiting for E6 commercial receivers
3 December 2011 REGINA presentation - IGS 39th GB Meeting 13
REGINA networkPreliminary coverage design
3 December 2011 REGINA presentation - IGS 39th GB Meeting 14
REGINA networkExisting, upgraded stations
3 December 2011 REGINA presentation - IGS 39th GB Meeting 15
REGINA networkCurrent IGS reference frame stations
3 December 2011 REGINA presentation - IGS 39th GB Meeting 16
REGINA data centers
Locations
• Primary data center at CNES (Toulouse)• Redundant data center at IGN (Saint-Mandé)
1. Real-time data flow
• NTRIP streams• Broadcast to registered users via CNES caster
2. RINEX files
• Acquisition of consolidated 15min data files• Conversion to RINEX2&3 (15min/1s, 1h/1s, 1h/30s, 24h/30s)• Diffusion to IGS/EUREF data centers
3. Remote configuration and control of receivers
• Remote monitoring• Alert messages• Maintenance and administration of station and transmission network• Configuration test
3 December 2011 REGINA presentation - IGS 39th GB Meeting 17
All REGINA stations proposed for integration into the IGS network
• IGS guidelines included in the REGINA station requirements• Enhancement of the IGS real-time network coverage• Upgrade/duplication of existing IGS (RF) stations
Participation to the IGS M-GEX campaign
• CNES/IGN common proposal through REGINA
Lifetime
• Project life: 30 years• Station life: Agreements with host organizations allow perennial installations.
Contribution to the IGS
3 December 2011 REGINA presentation - IGS 39th GB Meeting 18