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Optimal Vertical Placement of Total Station
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Samhällsplanering och miljö, Geodesi och satellitpositionering. WSP Civils, Department of Geographic Information and Asset Management.ORCID-id: 0000-0003-1602-4771
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Samhällsplanering och miljö, Geodesi och satellitpositionering.ORCID-id: 0000-0003-0382-9183
KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Samhällsplanering och miljö, Geodesi och satellitpositionering.ORCID-id: 0000-0002-8792-3646
WSP Civils, Department of Geographic Information and Asset Management.
2018 (engelsk)Inngår i: Journal of Surveying Engineering, ISSN 0733-9453, E-ISSN 1943-5428Artikkel i tidsskrift, Editorial material (Fagfellevurdert) Published
Abstract [en]

When using the free station method, a Total Station (TS) is established by performing distance and angle observations toward a number of Control Points (CPs). The quality of the establishment is crucial for the quality of subsequent measurements. The optimal horizontal location of the TS has been investigated in previous studies. Even the vertical precision is important in many applications, especially with significant height variations. Therefore in this paper, we focus on the optimality of vertical location of the TS. As an optimality criterion, the sum of TS coordinates and orientation variances is used. To investigate the optimization problem, an analytical as well as a trial and error method is developed. Both methods showed that the height component has no significant influence on the optimal vertical placement of the TS. Inspection of results from the trial and error method, where the CPs are moved in different height layers, indicates differences in the height uncertainty of the establishment in micrometer range, which is negligible for most engineering applications.

sted, utgiver, år, opplag, sider
2018.
HSV kategori
Forskningsprogram
Geodesi och geoinformatik
Identifikatorer
URN: urn:nbn:se:kth:diva-219569DOI: 10.1061/(ASCE)SU.1943-5428.0000255ISI: 000436097700001Scopus ID: 2-s2.0-85045743986OAI: oai:DiVA.org:kth-219569DiVA, id: diva2:1163692
Merknad

QC 20180115

Tilgjengelig fra: 2017-12-07 Laget: 2017-12-07 Sist oppdatert: 2018-07-17bibliografisk kontrollert
Inngår i avhandling
1. Optimal Design in Geodetic GNSS-based Networks
Åpne denne publikasjonen i ny fane eller vindu >>Optimal Design in Geodetic GNSS-based Networks
2017 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

An optimal design of a geodetic network helps the surveying engineers maximise the efficiency of the network. A number of pre-defined quality requirements, i.e. precision, reliability, and cost, of the network are fulfilled by performing an optimisation procedure. Today, this is almost always accomplished by implementing analytical solutions, where the human intervention in the process cycle is limited to defining the requirements. Nevertheless, a trial and error method can be beneficial to some applications. In order to analytically solve an optimisation problem, it can be classified to different orders, where an optimal datum, configuration, and optimal observation weights can be sought such that the precision, reliability and cost criteria are satisfied.

In this thesis, which is a compilation of six peer-reviewed papers, we optimised and redesigned a number of GNSS-based monitoring networks in Sweden by developing new methodologies. In addition, optimal design and efficiency of total station establishment with RTK-GNSS is investigated in this research.

Sensitivity of a network in detecting displacements is of importance for monitoring purposes. In the first paper, a precision criterion was defined to enable a GNSS-based monitoring network to detect 5 mm displacements at each network point. Developing an optimisation model by considering this precision criterion, reliability and cost yielded a decrease of 17% in the number of observed single baselines implying a reliable and precise network at lower cost. The second paper concerned a case, where the precision of observations could be improved in forthcoming measurements. Thus a new precision criterion was developed to consider this assumption. A significant change was seen in the optimised design of the network for subsequent measurements. As yet, the weight of single baselines was subject to optimisation, while in the third paper, the effect of mathematical correlations between GNSS baselines was considered in the optimisation. Hence, the sessions of observations, including more than two receivers, were optimised. Four out of ten sessions with three simultaneous operating receivers were eliminated in a monitoring network with designed displacement detection of 5 mm. The sixth paper was the last one dealing with optimisation of GNSS networks. The area of interest was divided into a number of three-dimensional elements and the precision of deformation parameters was used in developing a precision criterion. This criterion enabled the network to detect displacements of 3 mm at each point.

A total station can be set up in the field by different methods, e.g. free station or setup over a known point. A real-time updated free station method uses RTK-GNSS to determine the coordinates and orientation of a total station. The efficiency of this method in height determination was investigated in the fourth paper. The research produced promising results suggesting using the method as an alternative to traditional levelling under some conditions. Moreover, an optimal location for the total station in free station establishment was studied in the fifth paper. It was numerically shown that the height component has no significant effect on the optimal localisation.

sted, utgiver, år, opplag, sider
KTH Royal Institute of Technology, 2017. s. 72
Serie
TRITA-SOM, ISSN 1653-6126 ; 2018-01
HSV kategori
Forskningsprogram
Geodesi och geoinformatik
Identifikatorer
urn:nbn:se:kth:diva-221067 (URN)978-91-7729-631-7 (ISBN)
Disputas
2018-02-09, Kollegiesalen, Brinellvägen 8, Stockholm, 13:00 (engelsk)
Opponent
Veileder
Merknad

QC 2080115

Tilgjengelig fra: 2018-01-15 Laget: 2018-01-11 Sist oppdatert: 2018-02-26bibliografisk kontrollert

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