Analysis Center Response Form
             Joint CSTG/IERS Call for Participation
     International VLBI Service for Geodesy and Astrometry


Analysis Center name: DGFI       (Deutsches Geodätisches Forschungsinstitut)
Type of analysis center: global___ special_x__

Parent/Funding organization: DGFI within the framework of the German
"Forschungsgruppe Satellitengeodäsie" (FGS).

Name and title of primary scientific/technical contact: Dr. Harald Schuh,
Head of Earth Rotation Section

Name and title of administrative contact: Dr. Hermann Drewes, Director DGFI

Mailing address:
               Dr. Harald Schuh    
               Marstallplatz 8
               80539 München
               Germany        

Phone:    +49/89-23031-214                   Fax: +49/89-23031-240

E-mail address: schuh@dgfi.badw.de    Web address: http://www.dgfi.badw.de

If applying as a Special Analysis Center, describe the special type(s) of
analysis you will perform. If applying as a Global Analysis Center,
describe the global analysis you will perform. Indicate your specific
analysis interests and describe how you select the data you analyze. 

Analysis of IRIS-S experiments 
Primary goals are: 
          Determination of Earth rotation parameters. 
          Comparison of the results obtained by two different VLBI software
     packages, Occam and the Mark III Data Analysis System (Calc/Solve).
     -    Investigation of geodynamical and astronomical effects, such as short
     period variations of the ERPs, Free Core Nutation and others.



Describe the computer hardware configuration and the software package(s)
you use for analysis.

Several Personal Computers and Unix Workstations are available at DGFI and
additional access exists to the Computer Center "Leibniz Rechenzentrum" (LRZ)
where parallel and vector computers can be used. 

The Occam VLBI software will be used which was developed by Schuh in the
80ies, and was extended by Zarraoa later within a German-Spanish joint
project. Today, a user group chaired by O. Titov (Univ. of St. Petersburg) is
jointly maintaining and  improving the software. Occam is running on every PC
(486 onwards) and there exists also a Unix-version. Detailed comparisons
between Calc and Occam were carried out by Zarraoa in 1992 and yielded an
agreement on the level of a few psec. However, Occam still needs to be updated
corresponding to the IERS 1996 Conventions and has to be improved in several
practical aspects. For comparisons of the results obtained by Occam the Mark
III Data Analysis System (installed at GIUB, Bonn) will be used which is
accessible from DGFI. Since May 1997, a joint research project by DGFI and
GIUB is sponsored by the German Research Foundation (DFG). The goal of this
project is to create a knowledge-based shell around the existing Mark III Data
Analysis System in order to accelerate and partly automate the process of data
analysis.

The use of two software packages in parallel allows the direct comparison
between the two programs  and between the results obtained by the different
software.

Internet connection type or bit rate: TCPIP Ethernet 10 Mbaud
Data storage capacity: 10 Gigabyte
archiving capacity: some Terabyte

Describe any planned facility upgrades. -

Number of full-time-equivalent personnel assigned to analysis center
functions: 1

Indicate which data center(s) you use: within the FGS, VLBI databases will be
obtained from the Geodetic Institute of the Univ. of Bonn (GIUB) and from the
Bundesamt fur Kartographie und Geodesie (BKG), Leipzig

Indicate which of the following IVS Analysis Center functions you will
perform and explain briefly how you will perform them:
     Place final results (TRF, CRF, EOP, and others) in IVS Data Centers:
yes 
     Perform software development and documentation: yes
     Compare products: yes (compare both the products and the two software
packages) 
     Adhere to IERS Conventions: yes (H. Schuh is chairman of the IAG /
ETC Working Group 6 (Solid Earth Tides in Space Geodetic Techniques'), one
of the tasks of this WG is to improve the IERS Conventions with regard of
practicability and simplicity of use)
 
Attach a list of personnel (names and titles) whom you designate as IVS
Associate Members through their affiliation with your analysis center.:
Hermann Drewes, Harald Schuh, Wolfgang Schwegmann

Please provide any other information that you feel will be helpful in
demonstrating your analysis center's capabilities to participate in the
IVS. If you proposed to the IERS in 1995/6 as an analysis center and wish
to have that proposal carry over to the IVS, please make such a statement
in this proposal. 

So far, intensive comparisons between the Calc/Solve and the Occam packages
have been made. If equal weights of the observables are applied and if the
solution is parameterized equally the post fit residuals and the geodetic
results agree within a few mm.


Your signature on this form indicates your agreement to participate in the
IVS as an Analysis Center and to work closely with the IVS Analysis
Coordinator. If this is a new proposal (i.e. not carried over from IERS)
your signature commits your organization to participate in the IVS.


Name of person signing: Hermann Drewes     Title: Dr., Director DGFI

Signature: __H. Drewes_____________________Date:  Sept. 01, 1998