Abstract
Application of Optimal Ellipsoid Fitting for Curvature Change Tracking in Main Reflector of Complex Antenna Structures
Highlights
Very long baseline interferometry (VLBI) is a technology for precisely determining the location of a measurement point by analyzing the differences in signal arrival time between observation stations
We propose a new curvature change tracking measurement technique based on a 3D geometrical model and close-range photogrammetry
The VLBI antenna is of the Cassegrain type, which consists of a main reflector with a diameter of 22 m and a subreflector with a diameter of 2.2 m
Summary
Very long baseline interferometry (VLBI) is a technology for precisely determining the location of a measurement point by analyzing the differences in signal arrival time between observation stations. Deviation from the design shape can introduce measurement biases, which influence VLBI observations This is because changes in the focal length of the main reflector or local deformations on the reflector’s surface directly result in biased signal paths and, biased baseline estimates.[1,2]. The techniques are generally not suited for tasks requiring a large number of measurement points distributed over an object surface or for complete surface measurements.[3] In these cases, close-range photogrammetry is a valuable alternative for the design of powerful and flexible measurement tools. An optimal geometric model of scattered data in a 3D space was constructed by algebraic ellipsoid fitting, and the data were used as fundamental data for calculating the curvature changes of the main reflector. To increase the accuracy of geodetic and astrometrical measurements performed by the VLBI antenna, a program that could periodically calculate the curvature changes of the main reflector with minimum labor and cost was developed
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
