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GNSS-mätning vid olika tidpunkter: En studie om osäkerhet
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences.
2017 (Swedish)Independent thesis Basic level (university diploma), 5 credits / 7,5 HE creditsStudent thesisAlternative title
GNSS-measurements at different times : A study of uncertainty (English)
Abstract [sv]

Syftet med arbetet är att undersöka om olika tidpunkter under dagen påverkar osäkerheten vid GNSS-baserade mätningar. För att undersöka detta så har mätningar gjorts på två kända punkter vid flera olika tillfällen. Mätningarna som jämförts är gjorda på förmiddag, eftermiddag och kväll. Punkterna som använts ligger i Östersund och i Hallen. Utrustning som använts är en handenhet av märket Nomad och en TopCon Hiper II GNSS-mottagare med stativ och trefot. Mätningarna har gjorts med NRTK i koordinatsystemet SWEREF99 14 15. Datat analyserades i SBG GEO och jämfördes sedan i Microsoft Excel. Resultatet blev en genomsnittlig skillnad radiellt på 3 mm i plan. Vid tre av fyra tillfällen så blev osäkerheten mindre på förmiddagen än på eftermiddag/kväll. Den största skillnaden på mätningarna var 8 mm.

Abstract [en]

The purpose of this study is to investigate whether different times during a day affect GNSSbased measurements. To investigate this, measurements were made on two known points at several occasions. The measurements compared are made in the morning, afternoon and evening. The points used are located in Östersund and in Hallen. The equipment that was used were a Nomad handheld computer and a TopCon Hiper II GNSS receiver with tripod and footer. The measurements were performed with NRTK in the coordinate system SWEREF99 14 15. The data was analyzed in SBG GEO and then compared in Microsoft Excel. The result was an average radial difference of 3 mm in plane. At three out of four times, the accuracy was better in the morning than in the afternoon/evening. The maximum difference between measurements was 8 mm.

Place, publisher, year, edition, pages
2017. , p. 32
National Category
Environmental Analysis and Construction Information Technology
Identifiers
URN: urn:nbn:se:kau:diva-56720OAI: oai:DiVA.org:kau-56720DiVA, id: diva2:1118865
External cooperation
Mätservice AB
Subject / course
Geomatics
Educational program
Programme in Surveying and Cartography (120 ECTS credits)
Supervisors
Examiners
Available from: 2017-09-07 Created: 2017-07-02 Last updated: 2017-09-07Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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