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Prospective Improvements of IVS Products and Evolvement of Observing Programs. Harald Schuh WG2 Chair Vienna University of Technology hschuh@luna.tuwien.ac.at 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

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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

hschuh@luna.tuwien.ac.at

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 StatusGoals(2002-2005)

    polar motionaccuracy xp ~100 s, yp ~200 sxp, yp: 50 ... 25 slatency 1-4 weeks... 4 months4 - 3 days...1dayresolution 1 day1 day...1h... 10minfreq. of sessions ~3 d/week.........7d/week

    UT1accuracy 5... 20 s3.................. 2 slatency 1 week4 - 3 days .... 1dayresolution 1 day1 day ....... 10min

    , accuracy 100... 400 arcsec50...25 arcsec latency 1-4 weeks... 4 months4 - 3days... 1 dayresolution 1 day1 dayfreq. of sessions ~3 d/week.......... 7 d/week

    TRF (x,x,z)accuracy 5-20 mm5 .............. 2 mm.... ........

    CRFaccuracy 0.25-3 mas0.25 mas (improved distribution)freq. of solution 1 y1 ylatency 3-6 months3 ............. 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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