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Inledande försökt till mätning med Europas navigeringssystem Galileo
Stockholm University, Faculty of Science, Department of Physical Geography.
2016 (Swedish)Independent thesis Advanced level (degree of Master (Two Years)), 30 credits / 45 HE creditsStudent thesisAlternative title
Initial field measurements with the European navigation system Galileo (English)
Abstract [en]

Europe is presently building up a satellite navigation system of their own, Galileo. Unlike the American system, GPS, and the Russian system, Glonass, Galileo will be a civilian system. It will be independent from, but interoperable with both GPS and Glonass. After many delays have enough satellites been launched and placed in orbit to make it possible to start up Galileo’s initial services during December 2016.

This study gives an account of the construction and development of the Galileo system. During two weeks in the spring 2016 experimental RTK measurements were made with Galileo combined with GPS where the satellite corrections were distributed from Lantmäteriet’s (the Swedish mapping, cadastral and land registration authority’s) supportsystem for satellite positioning, SWEPOS. The measurements were carried out with singlestation RTK towards a SWEPOS reference station at Mosebacke on Södermalm in Stockholm. The rover was placed over a fixed point about 1.2 km from the reference station.The purpose of the study was to determine if it was possible in the spring 2016 to make any measurements with Galileo and to see what Galileo can add to RTK measurements combined with GPS in SWEPOS.

During the spring 2016 it was not possible to make any measurements with only Galileo satellites due to the fact that there were too few satellites in orbit. The results from the measurements indicate that combining Galileo and GPS could be positive for network RTK in SWEPOS. The part of achieved fixed solutions increases, the average time until fixed solution is achieved shortens and the space vehicle geometry (PDOP) gets a better value when combining GPS and Galileo. It is however too soon to say anything certain about the influence of Galileo on the position uncertainty.

Abstract [sv]

Europa håller på att bygga upp ett eget satellitnavigeringssystem, Galileo. Till skillnad från det amerikanska systemet GPS är Galileo ett civilt system som kommer att vara oberoende av, men kompatibelt med, GPS och den ryska motsvarigheten Glonass. Efter stora förseningar har nu tillräckligt många satelliter placerats i omloppsbana så att det kan vara möjligt att starta upp Galileos tidiga tjänster (initial services) under december 2016. Detta arbete belyser Galileos uppbyggnad och utveckling.

Under våren 2016 gjordes testmätningar med Galileo kombinerat med GPS där korrigeringsdata erhölls från Lantmäteriets stödsystem SWEPOS. Mätningarna gjordes med enkelstations-RTK mot SWEPOS referensstation Mosebacke på Södermalm i Stockholmöver en punkt belägen ca 1,2 km från Mosebacke. Syftet var att se om det under våren 2016 gick att göra mätningar mot Galileo och undersöka vad Galileo skulle tillföra RTK-mätning tillsammans med GPS i SWEPOS.

Det var inte möjligt under våren 2016 att utföra mätningar mot enbart Galileo då det vid tidpunkten för mätningarna inte fanns tillräckligt många satelliter i omloppsbana. Resultaten från mätningarna i denna studie tyder på att Galileo tillför bättre satellittäckning vid RTK-mätning tillsammans med GPS, andelen fixlösningar ökar, tiden till att fixlösning erhålles blir kortare och satellitgeometrin blir bättre. Det ärdäremot för tidigt att med säkerhet uttala sig om Galileos påverkan på positionsosäkerheten, både i plan och höjd.

Place, publisher, year, edition, pages
2016. , 52 p.
Keyword [sv]
Galileo, satellitnavigering, satellitnavigeringssystem, testmätning
National Category
Physical Geography
Identifiers
URN: urn:nbn:se:su:diva-138994OAI: oai:DiVA.org:su-138994DiVA: diva2:1070552
External cooperation
Lantmäteriet Gävle
Presentation
(Swedish)
Supervisors
Examiners
Available from: 2017-02-01 Created: 2017-01-31 Last updated: 2018-01-13Bibliographically approved

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