This paper presents Precise Point Positioning (PPP), a method of GPS observation processing from a single receiver that provides coordinates of the highest quality. The requirements for high quality ...results are an exact mathematical model, high quality GPS biases modelling, and high quality IGS products. On the basis of monthly GPS observations from a permanent station GRAZ in Graz, Austria, we will demonstrate that PPP method is able to determine stations position with the accuracy and precision of a centimetre in the ITRF global coordinate frame. Because of high precision transformation between ITRF and ETRS89, the PPP method can also be used in Slovenia to determine high precision positions in the national coordinate reference system of Slovenia (D96/TM), as it is based on ETRS89.
...the vertical movement of the tide gauge should be included in the series of observations. Tide gauge and GPS measurements of crustal motion and sea level rise along the eastern margin of Adria. ...The Difficulties in Using Tide Gauges to Monitor Long-Term Sea Level Change. https://www.fig.net/resources/monthly_artides/2010/ july_2010/july_2010_hannah.pdf, pridobljeno 10. Technical Report NOS CO-OPS 065. noaa National Oceanic and Atmospheric Administration, U.S. DEPARTMENT OF COMMERCE, National Ocean Service, Center for Operational Oceanographic Products and Services. https://tidesandcurrents.noaa.gov/publications/Technical_Report_ NOS_CO-OPS_065.pdf, pridobljeno 3.
Tide gauges are used to assess sea level changes. Usually, they are placed on the coast (piers), which can be unstable. Consequently, the vertical movement of the tide gauge should be included in the ...series of observations. The paper deals with the stability of the tide gauge Station Koper (MP Koper), the stability of which was determined relatively on the basis of the levelling network, which was stabilised nearby. The stability of the individual benchmarks was analysed and the velocity vector of vertical displacement of each benchmark was determined with respect to the benchmark 9000 tide gauge. The stability of the tide gauge was also determined in a global reference system by using the series of GNSS observations of the KOPE continuously operating reference GNSS station. The KOPE station is stabilised at the MP Koper and is included in the Slovenian GNSS network of the SIGNAL continuously operating reference network of permanent stations. The vertical velocity vector of the point KOPE was compared with the vertical velocity vectors at other tide gauges, which are located along the Croatian coast, and the tide gauges in Trieste.
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