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Determining receiver biases in GPS-derived total electron content in the auroral oval and polar cap region using ionosonde measurements |
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| Authors: | David R Themens P T Jayachandran R B Langley J W MacDougall M J Nicolls |
| Institution: | 1. Department of Physics, University of New Brunswick, Fredericton, NB, E3B 5A3, Canada 2. Department of Geodesy and Geomatics Engineering, University of New Brunswick, Fredericton, NB, E3B 5A3, Canada 3. Department of Physics and Astronomy, University of Western Ontario, London, ON, N6A 3K7, Canada 4. Center for Geospace Studies, SRI International, Menlo Park, CA, USA |
| Abstract: | Global Positioning System (GPS) total electron content (TEC) measurements, although highly precise, are often rendered inaccurate due to satellite and receiver differential code biases (DCBs). Calculated satellite DCB values are now available from a variety of sources, but receiver DCBs generally remain an undertaking of receiver operators and processing centers. A procedure for removing these receiver DCBs from GPS-derived ionospheric TEC at high latitudes, using Canadian Advanced Digital Ionosonde (CADI) measurements, is presented. Here, we will test the applicability of common numerical methods for estimating receiver DCBs in high-latitude regions and compare our CADI-calibrated GPS vertical TEC (vTEC) measurements to corresponding International GNSS Service IONEX-interpolated vTEC map data. We demonstrate that the bias values determined using the CADI method are largely independent of the topside model (exponential, Epstein, and α-Chapman) used. We further confirm our results via comparing bias-calibrated GPS vTEC with those derived from incoherent scatter radar (ISR) measurements. These CADI method results are found to be within 1.0 TEC units (TECU) of ISR measurements. The numerical methods tested demonstrate agreement varying from within 1.6 TECU to in excess of 6.0 TECU when compared to ISR measurements. |
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