Vienna mapping function was used for mapping tropospheric delays. Antenna phase centers were modelled based on igs08.atx and epnc_08.atx files. Bernese calculations were performed based on double difference processing. In GIPSY, precise point positioning method with fixing ambiguities was used. The cut-off angle was set to 10 degrees in order to avoid near-field multipath influence. For precise orbits, final products from CODE (CODE analysis centre at the Astronomical Institute of the University of Bern) and JPL (Jet Propulsion Laboratory) for Bernese and GIPSY solutions were used, respectively. In the computations daily GPS-only solution was used. For the set of ESTREF stations established in 2007, we perform as well computations with GIPSY 6.4 software (Ries et al., 2015). We re-process data from 2007 until 2015 with program Bernese GNSS 5.2 (Dach, 2015). For long time stability of stations and time-series analysis the re-processing of Estonian CORS data is ongoing. For GNSS-RTK service one needs precise coordinates in well-defined reference frame, i.e., ETRS89. In 2014-15 extensive reconstruction of ESTREF was carried out, including the establishment of 18 new stations, change of the hardware in CORS stations as well as establishing GNSS-RTK service for the whole Estonia. GNSS permanent station network in Estonia (ESTREF) was established already in 2007.
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