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Authors: Rainville, Nicholas* 
Palo, Scott* 
Larson, Kristine M.* 
Mattia, Mario* 
Title: Design and Preliminary Testing of the Volcanic Ash Plume Receiver Network
Journal: Journal of Atmospheric and Oceanic Technology 
Series/Report no.: /36 (2019)
Issue Date: 2019
DOI: 10.1175/JTECH-D-18-0177.1
Abstract: The presence of volcanic ash in the signal path between a GPS satellite and a ground-based receiver strongly correlates with a decrease in GPS signal strength. This effect has been seen in data collected from GPS sites located near active volcanoes; however, the sparse placement of existing GPS sites limits the applicability of this technique as an ash plume detection method to relatively few well-instrumented volcanoes. This deficiency has motivated the development of a low-cost distributed sensor system based on navigation-grade GPS receivers, which can take advantage of attenuated GPS signals to increase the quality and availability of real-time ash plume observations during an eruption. This GPS-based system has been designed specifically to meet remote sensing needs while operating autonomously in difficult conditions and minimizing on-site infrastructure requirements. Prototypes of this system have undergone long-term testing and the data collected from this testing have been used to develop the additional processing steps necessary to account for the different behavior of navigation grade GPS equipment compared to the geodetic equipment used at existing GPS sites.
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