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Estimation of Focal Length Variations of a 100-m Radio Telescope's Main Reflector by Laser Scanner Measurements 

Holst, Christoph; Zeimetz, Philipp; Nothnagel, Axel; Schauerte, Wolfgang; Kuhlmann, Heiner (2012-08)
Due to gravitation, the main reflector of a radio telescope underlies a deformation which causes a change in focal length depending on the variations of the elevation angle of the telescope. In order to estimate these ...
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Modeling the Beam Deflection of a Gantry Crane under Load 

Holst, Christoph; Burghof, Martin; Kuhlmann, Heiner (2014-02)
Gantry cranes load and unload containers from container ships. To ensure safety and operation, the deflection of their main beams under load should be analyzed. This deflection depends on the weight of the loaded container ...
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Accurate georeferencing of TLS point clouds with short GNSS observation durations even under challenging measurement conditions 

Zimmermann, Florian; Holst, Christoph; Klingbeil, Lasse; Kuhlmann, Heiner (2018-08-29)
The accuracy of georeferenced TLS point clouds is directly influenced by site-dependent GNSS effects, deteriorating the accuracy of the ground control point coordinate estimation. Especially under challenging GNSS ...
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Automatic optimization of height network configurations for detection of surface deformations 

Holst, Christoph; Eling, Christian; Kuhlmann, Heiner (2013-05-18)
Levellings are performed to observe height changes of different epochs at discrete surveying points. A reliable estimation of surface deformations by a bivariate polynomial needs a sufficient configuration of the underlying ...
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Aiming at self-calibration of terrestrial laser scanners using only one single object and one single scan 

Holst, Christoph; Kuhlmann, Heiner (2014-12-05)
When using terrestrial laser scanners for high quality analyses, calibrating the laser scanner is crucial due to unavoidable misconstruction of the instrument leading to systematic errors. Consequently, the development of ...
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Biased and unbiased estimates based on laser scans of surfaces with unknown deformations 

Holst, Christoph; Artz, Thomas; Kuhlmann, Heiner (2014-10-02)
The estimates based on laser scans of surfaces with unknown deformations are biased and not reproducible when changing the scanning geometry. While the existence of a bias is only disadvantageous at some applications, ...
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Flächenhafte Deformationsanalysen mit terrestrischen und Nahbereichslaserscannern: eine Gegenüberstellung anhand von Beispielen 

Holst, Christoph; Dupuis, Jan; Paulus, Stefan; Kuhlmann, Heiner (2014)
Dieser Beitrag stellt einen Überblick über den Ablauf einer flächenhaften Deformationsanalyse basierend auf terrestrischen Laserscannern (TLS) dar, wobei speziell auf die Datenerfassung, Vorverarbeitung und Auswertung ...
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Improved area-based deformation analysis of a radio telescope’s main reflector based on terrestrial laser scanning 

Holst, Christoph; Nothnagel, Axel; Blome, Martin; Becker, Philip; Eichborn, Malwin; Kuhlmann, Heiner (2015-03-14)
The main reflectors of radio telescopes deform due to gravitation when changing their elevation angle. This can be analyzed by scanning the paraboloid surface with a terrestrial laser scanner and by determining focal length ...
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Impact of spatial correlations on the surface estimation based on terrestrial laser scanning 

Jurek, Tobias; Kuhlmann, Heiner; Holst, Christoph (2017-07-19)
In terms of high precision requested deformation analyses, evaluating laser scan data requires the exact knowledge of the functional and stochastic model. If this is not given, a parameter estimation leads to insufficient ...
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Challenges and present fields of action at laser scanner based deformation analyses 

Holst, Christoph; Kuhlmann, Heiner (2016-03-31)
Due to improved laser scanning technology, laser scanner based deformation analyses are presently widespread. These deformation analyses are no longer based on individual points representing the deformation of an object ...
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Holst, Christoph (17)
Kuhlmann, Heiner (17)
Dupuis, Jan (2)Neuner, Hans (2)Nothnagel, Axel (2)Schwieger, Volker (2)Artz, Thomas (1)Becker, Philip (1)Blome, Martin (1)Burghof, Martin (1)... View MoreSubjectTerrestrisches Laserscanning (4)deformation analysis (3)terrestrial laser scanner (3)Terrestrial laser scanning (3)bivariate polynomial (2)laser scanning (2)network con guration (2)partial redundancies (2)selfcalibration (2)systematic errors (2)... View MoreClassification (DDC)
526.1 Geodäsie (17)
... View MoreResource TypeWissenschaftlicher Artikel (17)... View MoreDate Issued2016 (6)2014 (4)2012 (1)2013 (1)2015 (1)2017 (1)2018 (1)2019 (1)2020 (1)

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