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Development of a drone-based ground-penetrating radar system for efficient and safe 3D and 4D surveying of alpine glaciers
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Development of a drone-based ground-penetrating radar system for efficient and safe 3D and 4D surveying of alpine glaciers
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Development of a drone-based ground-penetrating radar system for efficient and safe 3D and 4D surveying of alpine glaciers
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Journal Article
Development of a drone-based ground-penetrating radar system for efficient and safe 3D and 4D surveying of alpine glaciers
2023
Overview
Recent research has highlighted the potential for high-resolution, high-density, 3D and 4D ground-penetrating radar (GPR) acquisitions on alpine glaciers. When carried out on foot, such surveys are laborious and time consuming, which limits their application to small domains of limited glaciological interest. Further, crevasses and other hazards make the data acquisition risky. To address these issues, we have developed a drone-based GPR system. The system has a payload weight of 2.2 kg and a data output rate of 14 traces per second. An 80-MHz antenna and a recording time of 2800 ns mean that depths of over 100 m can be reached in temperate ice. Differential GPS positioning assures accurate flight paths. At a speed of 4 m s−1 and height of 5 m above the glacier surface, our system can acquire over 4 line-km of GPR data in 20 min on a single set of drone batteries. After presenting the technical specifications of the system and tests required to optimize its performance, we showcase a recently acquired 3D dataset from the Otemma glacier in Switzerland, where 462 parallel GPR profiles were surveyed at a 1-m line spacing, totaling over 112 line-km of data, in only 4 days.
Publisher
Cambridge University Press
