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Analysis of Single-Frequency GNSS Data for Determination of Time-Dependent Flow and Deformation of Fast-Moving Glaciers
|Autor:||Davis, James L.; Elosegui, Pedro ; Nettles, Meredith|
|Fecha de publicación:||3-dic-2012|
|Editor:||American Geophysical Union|
|Citación:||AGU Fall Meeting: G13B-0953 (2012)|
|Resumen:||Single-frequency GNSS data has not generally been used for high-accuracy geodetic applications since the 1990s, but there are significant advantages if single-frequency GNSS receivers can be usefully deployed for studies of fast-moving outlet glaciers. The cost for these receivers is significantly lower (~50%) than for dual-frequency receivers, a significant benefit given the high spatial density at which these system are deployed on the glacier and the high risk for damage or loss in the glacial environment. In addition, the size of the data files that need to be transferred from extremely remote locations, often at very slow transmission rates, is significantly reduced. Consideration of single-frequency systems for this application is viable because of the relatively small extent (< 50 km) of the entire network to be deployed. Unfortunately, the availability of research-quality software that can perform kinematic solutions on single-frequency data is limited. We have developed the BAKAR software employing a stochastic filter to analyze single-frequency GNSS data. The software can implement a range of stochastic models for time-dependent site position. In this presentation, we describe the BAKAR software, and discuss its strengths and weaknesses. On one hand, chief among the challenges we have encountered are determination of accurate prior positions, and bursts of polar ionospheric activity that impede cycle-slip detection, even over intersite distances as short as 10 km. On the other hand, use of a single-frequency observable is theoretically less sensitive to multipath and signal scattering. We will quantitatively assess these effects, and assess the accuracy of BAKAR in a range of situations and applications|
|Descripción:||AGU Fall Meeting 3–7 December 2012, San Francisco, California|
|Versión del editor:||http://fallmeeting.agu.org/2012/eposters/eposter/g13b-0953/|
|Aparece en las colecciones:||(UTM) Comunicaciones congresos|
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