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Table 3
Parametrization of the VIE2020 and VIE2022b solutions.
| Parametrization options | |
|---|---|
| Clocks | piece-wise linear offsets (PWLO) with time interval 1 h with relative constraints 43 ps (13 mm) between offsets, one rate and quadratic term |
| Baseline clock offsets | offset without constraints at selected baselines |
| Zenith wet delay | PWLO with time interval 30 min with relative constraints 50 ps (15 mm) between offsets |
| Tropo. gradients | PWLO with time interval 3 h with relative constraints 0.5 mm between offsets |
| *ERP | PWLO with time interval 24 h with relative constraints 10 mas |
| fixed for networks with less than four telescopes | |
| *Celestial pole offsets | PWLO with time interval 24 h with relative constraints 0.1 µas |
| fixed for networks with less than four telescopes | |
| *Weighting | database weights (1/uncertainties) + elevation-dependent weighting |
| Datum definition | |
| CRF | NNR to ICRF3 defining sources except 0700-465, 0809-493 (see comment in Sect. 4) |
| TRF | NNT/NNR on coordinates and velocities to ITRF2014 on 21 stations for VIE2020 |
| NNT/NNR on coordinates and velocities to ITRF2020 on 21 stations for VIE2022b | |
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