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Prospective Improvements of IVS Products and Evolvement of Observing Programs. Harald Schuh WG2 Chair Vienna University of Technology [email protected] Wolfgang Schlüter IVS Chair Bundesamt für Kartographie und Geodäsie Fundamentalstation Wettzell Nancy Vandenberg IVSCC Director

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prospective improvements of ivs products and evolvement of observing programs

Prospective Improvements of IVS Products and Evolvement of Observing Programs

Harald Schuh

WG2 Chair

Vienna University of Technology

[email protected]

Wolfgang Schlüter

IVS Chair

Bundesamt für Kartographie und Geodäsie Fundamentalstation Wettzell

Nancy Vandenberg

IVSCC Director

NASA Goddard Space Flight Center

i v s international vlbi service for geodesy and astrometry
I V S - International VLBI Servicefor Geodesy and Astrometry

IVS is a service of

  • IAG - International Association of Geodesy
  • IAU - International Astronomical Union
  • FAGS - Federation of Astronomical and Geophysical Data Analysis Services

Main tasks of the IVS

    • Maintenance of the ICRF(International Celestial Reference Frame)
      • radio source positions and changes
    • Provision of products for
      • ITRF (International Terrestrial Reference Frame)
        • station positions and velocities
      • EOP - Earth Orientation Parameters
        • monitoring the celestial pole (d, dψ)
        • monitoring Universal Time (UT1) and length of day (LOD)
        • monitoring polar Motion (xp, yp)
the ivs 1999 2001
The IVS 1999 - 2001
  • IVS inauguration was on 1st of March, 1999
  • Demand for continuity in maintaining the reference frames forced to employ and accept the
    • existing infrastructure
    • existing observing programs (NEOS, CORE, ....)
    • related data handling
  • IVS efforts in 1999 - 2001
    • installation of its structure and components
    • Get used to the new tasks
  • 2001 review of products and observing programs ==> WG2
  • Basis for improving products and evolving observing programs to meet service requirements
wg2 on product specification and observing programs
WG2 onProduct Specification and Observing Programs

WG 2 established at the 5th IVS DB-Meeting on February 15th, 2001

The assignment of WG2 was to

    • review the usefulness and appropriateness of current IVS products,
    • recommend guidelines for accuracy, timeliness, and redundancy,
    • review the quality and appropriateness of observing programs,
    • set goals for improvements of IVS products,
    • suggest how these may possibly be achieved in the future,
    • suggest a realistic set of observing programs, taking into account existing agency programs.
  • Complete report was presented in November 2001 and accepted by the IVS Directing Board on Feb. 14th, 2002

available: http://ivscc.gsfc.nasa.gov

within IVS Annual Report 2001

members of the wg2
Harald Schuh (chair), TU Vienna (A)

Patrick Charlot, Obs. Bordeaux (F)

Hayo Hase, BKG (D)

Ed Himwich, NASA/GSFC (USA)

Kerry Kingham, USNO (USA)

Calvin Klatt, EMR (Canada)

Chopo Ma, NASA/GSFC (USA)

Zinovy Malkin, IAA (RU)

Arthur Niell, MIT Haystack (USA)

Axel Nothnagel, Univ. Bonn (D)

Wolfgang Schlüter, BKG (D)

Kazuhiro Takashima, GSI (JP)

Nancy Vandenberg, NASA/GSFC (USA)

Members of the WG2
  • Experts in various fields of VLBI
  • Involving many agencies
  • Different nations
  • to obtain broad acceptance within IVS
rationale and motivation for the work of wg2
Rationale and motivation for the work of WG2
  • Fundamental role of VLBI for the realization and maintenance of global reference frames
      • unique for the ICRF, essential for EOPs and scale of the ITRF
  • Requirement for precise reference frames (10-9), consistent for decades:

 IGGOS - Integrated Global Geodetic Observing System

  • Demand for combination of all techniques
      • to achieve the required accuracy
      • to eliminate systematic errors
      • to generate reliable and redundant results
  • Collaboration of all IAG Services

(IVS, ILRS, IGS, IDS, ... IERS)

ivs products some examples from wg2 report
Products Status Goals(2002-2005)

polar motion accuracy xp ~100 s, yp ~200 s xp, yp: 50 ... 25 s latency 1-4 weeks... 4 months 4 - 3 days...1day resolution 1 day 1 day...1h... 10min freq. of sessions ~3 d/week .........7d/week

UT1 accuracy 5... 20 s 3.................. 2 s latency 1 week 4 - 3 days .... 1day resolution 1 day 1 day ....... 10min

,  accuracy 100... 400 arcsec 50...25 arcsec latency 1-4 weeks... 4 months 4 - 3days... 1 day resolution 1 day 1 day freq. of sessions ~3 d/week .......... 7 d/week

TRF (x,x,z) accuracy 5-20 mm 5 .............. 2 mm .... .... ....

CRF accuracy 0.25-3 mas 0.25 mas (improved distribution) freq. of solution 1 y 1 y latency 3-6 months 3 ............. 1 month(s)

...... ....... ....... .......

IVS products (some examples from WG2 Report)
more ivs products see wg2 report
More IVS products (see WG2 Report)
  • EOP - dUT1/dt (lod) - dxp/dt, dyp/dt
  • TRF - x,y,z time series - episodic events - annual solutions - non-linear changes
  • CRF - source structure - flux density
  • Geodynamical Parameters - solid Earth tides h, l - ocean loading A,  - atmospheric loading α
  • Physical Parameters - tropospheric parameters (zenith delays, gradients) - ionospheric mapping - light deflection parameter 
new ivs observing programs
New IVS observing programs
    • IVS Program Committee was established in Sept. 2001
    • appropriate observing programs started 2002 for
      • Earth Orientation Parameters (EOP): IVS-R1 ... IVS-R4, IVS-INT1
        • Two rapid turn-around sessions each week,
        • Comparable xp, yp results.
        • Additional sessions employing S2 and K4 techniques (IVS-E3, IVS-INT2)
      • Terrestrial Reference Frame (TRF): IVS-T2
        • Monthly TRF sessions with 8 stations
      • Celestial Reference Frame (CRF): IVS-CRF
        • Bi-monthly RDV sessions using the VLBA and 10 geodetic stations,
      • CONT, annually or semi-annually IVS-CONT02
        • 14-day continuous sessions to demonstrate the best results that VLBI can offer
        • in 2002: CONT-session, October 16-31, 2002
      • Monthly R&D sessions: IVS-R&D
        • to investigate instrumental effects, research the network offset problem
  • Observing program 2002: geodetic VLBI observations will be increased by about 30%
  • Goal: future increase by ~100% till 2005
improvements required
Improvements required
  • weekend gaps, automation for unattended observing needed
  • reduce time delay and reduce expenses
    • development of a modern disc based recording system (Mk5)
    • development of data transfer via the Internet (e-VLBI)
  • global network configuration has to be improved
    • especially in the southern hemisphere
    • encourage additional institutions and include the S2 and K4 technologies
    • more observing time is required overall
  • timeliness, shorten turn-around time at the correlators (better logistical organization of tape/disc transport)
  • robustness of the products, more analysis centerswith different software
finally
Finally ....
  • To meet the ambitious goals all responsible members of the contributing agencies are kindly asked to support the IVS as much as possible

Thank you

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