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Accuracy analysis and Calibration of Total Station based on the Reflectorless Distance Measurement
KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Geodesy and Geoinformatics. (Master Thesis)
KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Geodesy and Geoinformatics. (Master Thesis)
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Abstract

Reflectorless EDM technology uses phase measuring or pulsed lasers to measure targets of a reflective and non-reflective nature. Reflectorless distance measurement provides rapid measurement by saving time and labour for surveyors. However, the accuracy of these types of measurements is under question because of the variety of constraints that affect the measurement.

This paper attempts to show the techniques of total station calibration and to investigate the possible sources of error in reflectorless distance measurement. As a result, the effects of different color targets and angle incidence on distance measurement were checked. The precision of reflectorless distance measurement also investigated. In addition, comparison was made for manual and automatic target recognition measurement. Further experiment was performed on how to calibrate the total station instrument and the performance of the instrument was checked by KTH-TSC software.

The experiments were evaluated by taking the reflector reading as ‘true value’ to check the accuracy of reflectorless measurement. The effects of colour surfaces on distance measurement have no significant difference. Besides, the result shows that the error in distance increased as the angle of incidence in the target increases. The result also indicates that automatic target recognition mode is the most advisable technique for precise measurement. Finally, an optimal number of seven target points was found for the calculation of prism constant.

Abstract [sv]

Sammandrag

Reflektorlös EDM-tekniken använder fas mätning eller pulsade lasrar för att mäta mål en reflekterande och icke-reflekterande karaktär. Reflektorlös avståndsmätning ger snabb mätning genom att spara tid och arbete för inspektörer. Emellertid är noggrannheten hos dessa typer av mätningar under fråga på grund av olika begränsningar som påverkar mätningen.

Denna uppsats försöker visa de metoder för totalstation kalibrering och att undersöka eventuella felkällor i reflektorlös avståndsmätning. Som ett resultat var effekterna av olika färger mål och vinkel inverkan på avståndsmätning kontrolleras. Noggrannheten i reflektorlös avståndsmätning undersökt också. Dessutom gjordes jämförelse för manuell och automatisk måligenkännande mätning. Ytterligare experiment utfördes på hur man kalibrerar totalstationen instrumentet och prestanda instrumentet kontrollerades av KTH-TSC programvara.

Experimenten utvärderades genom att reflektorn läsning som "sanna värdet" för att kontrollera riktigheten i reflektorlös mätning. Effekterna av färgytor på avståndsmätning har ingen signifikant skillnad. Dessutom visar resultatet felet i avståndet ökade infallsvinkeln i målet ökar. Resultatet visar också automatiskt måligenkännande läget är det mest lämpligt tekniken för exakt mätning. Slutligen ett optimalt antal av sju målpunkter hittades för beräkning av prismakonstanten.

Place, publisher, year, edition, pages
2012. , 67 p.
Series
TRITA-GIT EX 12-009, ISSN ISSN 1653-5227 ; ISRN KTH/GIT/EX--12/009-SE
Keyword [en]
Keywords: automatic target recognition, calibration, prism constant, reflectorless measurement
Keyword [sv]
Nyckelord: automatisk mål erkännande, kalibrering, prismakonstant, reflektorlös mätning
National Category
Other Natural Sciences
Identifiers
URN: urn:nbn:se:kth:diva-145749OAI: oai:DiVA.org:kth-145749DiVA: diva2:720441
Subject / course
Geodesy
Educational program
Degree of Master - Geodesy and Geoinformatics
Presentation
(English)
Supervisors
Examiners
Available from: 2014-06-04 Created: 2014-05-29 Last updated: 2015-04-23Bibliographically approved

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