Understanding the role of the ionospheric delay in single-point single-epoch GPS coordinates |
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Authors: | Elsa Mohino |
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Institution: | (1) Department of Geofísica y Meteorolgía, Facultad CC. Físicas, Universidad Complutense de Madrid, Ciudad Universitaria, 28040 Madrid, Spain |
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Abstract: | The ionospheric delay is the main source of error for single-point single-epoch (SPSE) GPS positioning when using single-frequency
receivers. In contrast to the common slant approach, in this article we focus on its effect in final coordinates through the
study of bias propagation in SPSE positioning: we first show an analytical resolution for the propagation problem with highly
symmetric satellite configurations. To overcome some of the disadvantages of this first method, we use Santerre’s technique
and, finally, present a new numerical methodology that allows us to generalize for a real geometry and obtain an average ionospheric
positioning error over a given site. From the results obtained, four working hypotheses that relate the ionospheric shape
above the receiver with final position errors are presented and tested. These four hypotheses, which agree with average ionospheric
positioning error in 95% of the studied cases, can be related to the construction of the design matrix. Finally, these hypotheses
have been used to address a situation where the ionospheric delay is corrected with an ionospheric model. |
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Keywords: | Error propagation GPS Ionosphere |
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