Technical description of SINEX solution opa2011a

1. Origin of input data: databases from IVS Data Center, version 4 or more.

2. Authentic processing steps after data retrieval: re-Calc, transform to 
   superfile, and put into BATCH Solve.

3. Origin of meteorological data: use database content.

4. Use numerical weather model: ECMWF for computing VMF1.

5. Setting of mapping functions: VMF1.

6. Origin of cable cal data: use database content.

7. Application of cable cal flags: use database settings.

8. Selection/settings of geophysical models: replace database settings.

   8.1. Nutation-precession: IAU 2006.
   
   8.2. Short-period tidal variations in x, y, UT1: IERS 2003.
   
   8.3. Troposphere mapping functions: VMF1.
   
   8.4. A priori mean gradients: from VLBI data or DAO weather model.
 
   8.5. Solid Earth tide: IERS Conventions 1996, pp. 56--65, step 1 and step 2,
        anelasticity variant, including tides of the 3-rd order.
 
   8.6. Ocean loading displacements: FES 2004.

   8.7. Atmospheric loading displacements: APLO (Petrov & Boy 2004).

   8.9. Thermal expansion: Nothnagel (2008).
   
   8.10. A priori station positions and velocities: opa2011a quarterly solution.
   
   8.11. A priori source coordinates: opa2011a quarterly solution.

9. Parameterization

   9.1. Clock: quadratic + continuous piece-wise linear with 60-min interval.

   9.2. Atmosphere: continuous piece-wise linear 20-min interval.

   9.3. Gradients: estimated at 6-hr interval except for the following 105 stations:
   
     AUSTINTX AZORES   BERMUDA  BLKBUTTE BLOOMIND BREST    CARNUSTY CARROLGA
     CHLBOLTN CTVASBAY CTVASTJ  DAITO    DEADMANL DSS13    DSS65A   EFLSBERG
     ELY      FLAGSTAF FORT ORD FORTORDS FTD 7900 GIFU11   GIFU3    GOLDMARS
     GOLDVENU GORF7102 GRASSE   HALEAKAL HOBART12 HOFN     HOHENFRG HOHNBERG
     JPL MV1  KAINAN   KANOZAN  KARLBURG KASHIM11 KIRSBERG KODIAK   KOGANEI 
     KOGANEI3 KWAJAL26 LEONRDOK MADRID64 MAMMOTHL MARCUS   MCD 7850 METSAHOV
     METSHOVI MIAMI20  MILESMON MIURA    MIYAZAKI MIZNAO10 MIZUSGSI MOJ 7288
     MON PEAK MV2ONSLA NOBEY 6M NOME     NRAO 140 NRAO85 1 OCOTILLO OVR 7853
     PBLOSSOM PENTICTN PINFLATS PLATTVIL PRESIDIO PT REYES PVERDES  QUINCY  
     ROBLED32 SAGARA   SANPAULA SEATTLE1 SEST     SHANGHAI SINTOTU  SNDPOINT
     SOURDOGH SUWON    TATEYAMA TIDBIN64 TIGOWTZL TITIJIMA TOMAKO11 TOULOUSE
     TROMSONO TRYSILNO TSUKU3   TSUKUBA  UCHINOUR USSURISK USUDA64  VERAISGK
     VERNAL   VICTORIA VLA-N8   WHTHORSE YAKATAGA YEBES    YEBES40M YELLOWKN
     YUMA     
     
   9.4. Earth orientation: polar motion and rate, UT1 and rate, nutation 
        offsets.
        
   9.5. Station positions: all.
   
   9.6. Station velocities: none.
   
   9.7. Source coordinates: all.
   
   9.8. Antenna axis offsets: no.
      
10. Outlier elimination: use database settings.

11. Generation of pre-reduced datum-free normal equations: Solve SINEX output.

12. Constraints (only of interest for direct EOP estimates)

   12.1. Sources: loose no-net rotation is uniformly applied to all sources 
         except the following 39 sources showing significant non-linear motions:
    
     0014+813 0235+164 0637-752 0738+313 1308+326 1448+762 2145+067 3C120   
     1610-771 0208-512 0438-436 0451-282 0919-260 0607-157 2243-123 NGC1052 
     2128-123 3C279    0106+013 2134+00  1021-006 3C273B   0528+134 2121+053
     0202+149 3C454.3  1611+343 OQ208    2201+315 2234+282 OK290    4C39.25 
     3C345    0711+356 3C84     1739+522 1044+719 0212+735 3C309.1  
     
   12.2. Stations: loose no-net rotation/translation on all stations except:
         - TIGOCONC after the earthquake of Feb. 2010,
         - Japanese stations after the earthquake of Mar. 2011,
         - WARK12M, YARRAM12M, and UCHINOUR.

13. Software: CALC 10.0, SOLVE revision date 2010.05.21.