Abstract
In this study, a static displacement monitoring program was developed to maintain the accurate performance of a Very Long Baseline Interferometry (VLBI) antenna by monitoring its structural stability. The monitoring program was designed to measure static displacement, among the many displacements of the antenna’s main reflector, which can directly affect its performance. The program measures the position of a monitored object with mm-level accuracy through close-range photogrammetry that uses high-resolution Charge Coupled Device (CCD) cameras. The developed program will be used to evaluate the structural soundness of an antenna based on continuous displacement measurements, which can also be used as basic data for repair and reinforcement work in the future.
Highlights
Very Long Baseline Interferometry (VLBI) is a technology that precisely determines the location of a measurement point by analyzing the differences in signal arrival time between observation stations
To maintain the performance of a VLBI antenna and its absolute position measurement accuracy, it must be monitored constantly and its deformation rate inspected continually. This diligence is needed because even a slight displacement of a few millimeters in the main reflector of the antenna directly affects VLBI measurement performance, which is utilized as the datum for national geodetic control points
The VLBI antenna is a complex structure built with various components and materials
Summary
Very Long Baseline Interferometry (VLBI) is a technology that precisely determines the location of a measurement point by analyzing the differences in signal arrival time between observation stations. To maintain the performance of a VLBI antenna and its absolute position measurement accuracy, it must be monitored constantly and its deformation rate inspected continually. This diligence is needed because even a slight displacement of a few millimeters in the main reflector of the antenna directly affects VLBI measurement performance, which is utilized as the datum for national geodetic control points. A close-range digital photogrammetry algorithm with a collinearity equation was applied to determine 3D position coordinates with mm-level accuracy for each monitoring object of the stereo images used for static displacement monitoring. To maintain the performance and position measurement accuracy of the VLBI antenna, a program was developed that can constantly monitor the deformation rate of a VLBI antenna surface with minimum manpower and cost
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