Terrestrial Laser Scanner Two-Face Measurements for Analyzing the Elevation-Dependent Deformation of the Onsala Space Observatory 20-m Radio Telescope's Main Reflector in a Bundle Adjustment

Terrestrial Laser Scanner Two-Face Measurements for Analyzing the Elevation-Dependent Deformation of the Onsala Space Observatory 20-m Radio Telescope's Main Reflector in a Bundle Adjustment

For accurate astronomic and geodetic observations based on radio telescopes, the elevation-dependent deformation of the radio telescopes' main reflectors should be known. Terrestrial laser scanning has been used for determining the corresponding changes of focal lengths and areal reflector defo...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Vol. 17; no. 8; p. 1833
Main Authors: Holst, Christoph, Schunck, David, Nothnagel, Axel, Haas, Rüdiger, Wennerbäck, Lars, Olofsson, Henrik, Hammargren, Roger, Kuhlmann, Heiner
Format: Journal Article
Language:English
Published: Switzerland MDPI AG 09-08-2017
MDPI
Subjects:
Bundle adjustment
calibration
Data processing
Deformation
deformation analysis
Elevation
Elevation angle
Lasers
Observatories
parameter estimation
radio telescope
Radio telescopes
Telescopes
terrestrial laser scanning
very long baseline interferometry
terrestrial laser scanning
very long baseline interferometry
deformation analysis
parameter estimation
bundle adjustment
calibration
radio telescope
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Summary:For accurate astronomic and geodetic observations based on radio telescopes, the elevation-dependent deformation of the radio telescopes' main reflectors should be known. Terrestrial laser scanning has been used for determining the corresponding changes of focal lengths and areal reflector deformations at several occasions before. New in this publication is the situation in which we minimize systematic measurement errors by an improved measurement and data-processing concept: Sampling the main reflector in both faces of the laser scanner and calibrating the laser scanner in situ in a bundle adjustment. This concept is applied to the Onsala Space Observatory 20-m radio telescope: The focal length of the main reflector decreases by 9.6 mm from 85 ∘ to 5 ∘ elevation angle. Further local deformations of the main reflector are not detected.
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ISSN:1424-8220
1424-8220
DOI:10.3390/s17081833