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  ITRF96 input data and computions description

The current strategy adopted for the ITRF96 solution is twofold :

  • - a simultaneous combination of positions and velocities using full variance/covariance matrices
  • - a rigorous weighting scheme based on the analysis and estimation of the variance components using Helmert method.

The ItrF96 solution is based on a combination of :

  • - a selected sets of individual solutions submitted to the IERS Central Bureau in 1997
  • - some past data provided in SINEX format
  • - recent submissions from GPS and DORIS specifically asked to improve ITRF by supplying new stations or recent positions to upgrade velocities.

The individual solutions selected for the ItrF96 analysis are 4 VLBI , 2 SLR , 8 GPS and 3 DORIS solutions, summarized in Table 1.

On the other hand, as a first step in the improvement of the use of the local ties, all the available vector eccentricities of colocated sites were converted into a complete set of positions for each site expressed in SINEX format.

Table 1 : Selected Solutions for the ITRF96 analysis

Solution Technique Ref. Epoch Data Span
SSC(GSFC) 97 R 01 VLBI 93:001 79-97
SSC(GIUB) 97 R 01 VLBI 93:001 84-96
SSC(NOAA) 95 R 01 VLBI 93:001 79-94
SSC(JPL) 97 R 01 VLBI(DSN) 93:001 91-96
SSC(CSR) 96 L 01 SLR Lageos 93:001 76-96
SSC(GSFC) 97 L 01 SLR Lageos 86:182 80-96
SSC(EMR) 97 P 01 GPS IGS 96:001 95-97
SSC(GFZ) 97 P 02 GPS IGS 94:365 93-96
SSC(CODE) 97 P 02 GPS IGS 95:076 93-97
SSC(EUR) 97 P 04 GPS EUREF 96:090 95-96
SSC(EUR) 97 P 03 GPS EUREF 96:339 96-97
SSC(MIT) 97 P 01 GPS IGS GNAAC 97:151 94-97
SSC(NCL) 97 P 01 GPS IGS GNAAC 96:001 95-97
SSC(JPL) 97 P 02 GPS IGS GNAAC 96:001 91-96
SSC(GRGS) 97 D 01 DORIS 93:001 93-96
SSC(CSR) 96 D 01 DORIS 93:001 93-96
SSC(IGN) 97 D 04 DORIS 93:001 90-97
 
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