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Reprocessing and analysis of 20-years SWEREF stations GPS data using BERNESE and GAMIT software
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för Industriell utveckling, IT och Samhällsbyggnad, Samhällsbyggnad, GIS. Lantmäteriet.ORCID-id: 0000-0003-1744-7004
Lantmäteriet.
2018 (Engelska)Konferensbidrag, Poster (med eller utan abstract) (Refereegranskat)
Abstract [en]

SWEREF 99 has been used as the national geodetic reference frame in Sweden since 2007 and is adopted by EUREF as an ETRS89 realization. It is defined by an active approach through the 21 original SWEPOS stations, hence relying on positioning services like the network RTK service and the post processing service. All alterations of equipment and software as well as movements at the reference stations will in the end affect the coordinates. For checking the effect of all alterations mentioned above and having a backup network of GNSS stations, approximately 300 nationally distributed passive so-called consolidation points are used. The main part of the consolidation points consists of so-called SWEREF points established already with the beginning in the mid-1990s. All stations are remeasured with static GNSS for 2x24 hours using choke ring antennas in a 6 years base with 50 points each year. The original processing was done with the Bernese GNSS software and the reprocessing was carried out with both the Bernese GNSS software and the GAMIT software in 2017-18 covering so far 20 years of data. The station coordinates were first estimated in ITRF2008 and then transformed to SWEREF 99 using the new land uplift model NKG2016LU and close by reference stations. The outcome will be used to analyse the stability of SWEREF 99 after two decades and has been used to define the SWEREF 99 component in the fit of the SWEN17_RH2000 geoid model to SWEREF 99 and RH 2000. Our analysis show a very good agreement between repeated measurements. The mean RMS of the SWEREF 99 coordinates which have had 3-times measurements (every ~6 years) is 2 mm for the horizontal components and 5-6 mm for height. Moreover, we did trend analysis to investigate the stability of the stations and check if any systematic trend exists in the transformed SWEREF99 coordinates. In general, no significant trend was observed. However, at some stations trends were observed due to local ground movements.

Ort, förlag, år, upplaga, sidor
2018.
Nyckelord [en]
GNSS, Reference frame, SWEPOS, GPS processing
Nationell ämneskategori
Annan naturvetenskap
Identifikatorer
URN: urn:nbn:se:hig:diva-27793OAI: oai:DiVA.org:hig-27793DiVA, id: diva2:1241940
Konferens
General Assembly of the Nordic Geodetic Commission (NKG) 2018, 3-6 September 2018, Helsinki, Finland
Tillgänglig från: 2018-08-26 Skapad: 2018-08-26 Senast uppdaterad: 2018-09-04Bibliografiskt granskad

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Nilfouroushan, Faramarz

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