RFWG report ______________________ IGS 39th Governing Board Meeting San Francisco, 3 December 2011 1

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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

http://webigs.ign.fr/en

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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


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)


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


REGINA networkPreliminary coverage design


REGINA networkExisting, upgraded stations


REGINA networkCurrent IGS reference frame stations


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


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


Documents

RFWG report ______________________ IGS 39th Governing Board Meeting San Francisco, 3 December 2011 1