spu00001.eopi.txt

 Technical description of solution spu00001

 1.  Purpose of solution:  Intensive EOP

 2   Analysis Center:  Saint-Petersburg University (SPU)

 3.  Short narrative description of solution:

 NEOS-Int. VLBI observations are analyzed for this solution.
 Reductional model is realised in accordance with IERS
 Conventions (1996), latest IERS Recommendations - IERS
 Gazettes 16,18 and Explanatory Supplement to IERS Conventions
 1996 (DGFI Report, No.71).  Celestial reference frame was fixed
 to Reference Frame Navy 1997-8. All parameters under estimation have
 been adjusted using conventional least squares technique. Station
 Wettzell is used as clock reference station when available.
 Terrestrial reference frame ITRF97 with  the associated velocity field
 is used for station coordinates.

 4.  Estimated parameters:

     a. celestial frame:  No

     b. terrestrial frame:  No

     c. Earth orientation:  UT1-UTC

     d. zenith troposphere:  Offset for wet delay

     e. troposphere gradient:  No

     f. station clocks:  Offset and rate

     g. baseline clocks:  No

     h. other:  No

 5.  Celestial reference frame:

     a. a priori source positions:  ICRF

     b. source positions adjusted in solution:  No

     e. solution identification or reference:  Navy 1997-8

 6 - Terrestrial reference frame:

     a. a priori station positions:  ITRF97

     b. a priori station velocities:  ITRF97 velocity field

     c. reference epoch:  1997.0

     d. station positions/velocities adjusted in solution:  No

     l. solution identification or reference:  ITRF97

 7.  Earth orientation:

     a. a priori precession model:  IAU(1976)

     b. a priori nutation model:  Herring's model as it recommended by
                                  IERS Conventions

     c. a priori short-period tidal variations in x, y, UT1:  IERS Conventions

     d. EOP estimation:  one UT1-UTC estimate from every 2-hour session

 8.  A priori geophysical models:

     a. troposphere: Niell mapping function for dry and wet delays

     b. solid Earth tide:  IERS Conventions 1996 plus Explanatory
        Supplement for pole tide correction.

     c. ocean loading:  IERS Conventions 1996

     d. atmosphere loading: information about local pressure has been used
        (see IERS Conventions 1996 plus Explanatory Supplement)

 9.  Data type:  delays

 10. Data editing:  Only data with zero quality flag in NGS format are used

 11. Data weighting: Observations with elevation more than 15 degrees are
     not weighted.  Observations with elevation less than 15 degrees to be
     divided by sin(elevation).

 12. Standard errors reported:  Formal errors are derived from
     least squares adjustment

 13  Software:  OCCAM v. 3.4 plus additional modifications

 14. Other information:  None

 ------------------------------------------------------------------------------
 Dr. Oleg A.Titov                        Tel:     +7-(812)-328-97-51
 Assistant professor
 of Astronomy Department                 Fax:     +7-(812)-428-71-29

 Astronomical Institute of Saint-Peterburg University
 Bibliotechnaya sq., 2, Petrodvorets, Saint-Petersburg, Russia, 198504
 olegtitov@mail.ru