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En osäkerhetsundersökning av GNSS-mottagare
Karlstad University, Faculty of Health, Science and Technology (starting 2013).
2017 (Swedish)Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesisAlternative title
An investigation of GNSS receiver uncertainty (English)
Abstract [en]

Today, GNSS measurements play an important role in the surveying industry, and their use is ever increasing. Many different GNSS receivers and antenna manufacturers are on the market with new ones appearing.

The purpose of this study is to investigate the level of measurement uncertainty of three different GNSS receivers: Leica GS15, Sokkia GCX2 and Satlab SL300.

The method in this study is based mainly on the method proposed by HMK - Geodatakvalitet 2015 (Manual in measurement and map issues – Geographic data quality 2015 [author’s translation]) by Swedish Lantmäteriet for "Evaluation of measurement uncertainty in Network RTK [author’s translation]”. Some corrections and additions are made to this method but the basis of the method is retrieved from there. Formulas are used to calculate radial deviation and limit requirements for these. Even standard deviations and radial mean deviations as well as tolerances for these are calculated. The field measurements are made on two RIX 95-points. This is done repeatedly to get up to 20 measurements. The GNSS receivers are mounted on a tripod with a tribrach that is centered over the known points.

The main finding from this study is that all investigated receivers, apart from four overriding values ​​for the Leica GS15, perform better than specified by their manufacturers. However, Sokkia GCX2 and Satlab SL300 are approved with uncertainties within the calculated tolerances. The Leica GS15 instrument is very close to meeting the demands but does not reach all the way. A committed error during the performed measurements with the Satlab SL300 makes its evaluation based on 19 instead of 20 measurements. Still, calculations are performed on the collected data that resulted in low measurement uncertainties well below the manufacturer's specified uncertainty.

The study was conducted during five weeks in May and June 2017.

Place, publisher, year, edition, pages
2017. , p. 44
Keywords [en]
GNSS, GPS, receivers, antenna, surveying, measurement uncertainty, HMK, Network RTK
Keywords [sv]
GNSS, GPS, mottagare, antenn, mätning, mätosäkerhet, HMK, nätverks-RTK
National Category
Engineering and Technology Other Engineering and Technologies not elsewhere specified
Identifiers
URN: urn:nbn:se:kau:diva-56723OAI: oai:DiVA.org:kau-56723DiVA, id: diva2:1118876
Educational program
Programme in Surveying and Cartography (120 ECTS credits)
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Examiners
Available from: 2017-08-22 Created: 2017-07-03 Last updated: 2017-08-22Bibliographically approved

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Faculty of Health, Science and Technology (starting 2013)
Engineering and TechnologyOther Engineering and Technologies not elsewhere specified

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Citation style
  • apa
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Output format
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