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Sensors 2017, 17(8), 1833; https://doi.org/10.3390/s17081833

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

1
Institute of Geodesy and Geoinformation, University of Bonn, Bonn D-53115, Germany
2
Onsala Space Observatory, Chalmers University of Technology, Onsala SE-43992, Sweden
*
Author to whom correspondence should be addressed.
Received: 26 June 2017 / Revised: 2 August 2017 / Accepted: 5 August 2017 / Published: 9 August 2017
(This article belongs to the Special Issue Sensors for Deformation Monitoring of Large Civil Infrastructures)
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Abstract

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. View Full-Text
Keywords: terrestrial laser scanning; deformation analysis; parameter estimation; bundle adjustment; calibration; radio telescope; very long baseline interferometry terrestrial laser scanning; deformation analysis; parameter estimation; bundle adjustment; calibration; radio telescope; very long baseline interferometry
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Holst, C.; Schunck, D.; Nothnagel, A.; Haas, R.; Wennerbäck, L.; Olofsson, H.; Hammargren, R.; Kuhlmann, H. 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. Sensors 2017, 17, 1833.

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