Abstract
The provision of accurate ionospheric corrections in PPP-RTK enormously improves the performance of single-receiver user integer ambiguity resolution (IAR), thus enabling fast high precision positioning. While an external provider can disseminate such corrections to the user with a time delay, it is the task of the user to accurately time-predict the corrections so that they become applicable to the user positioning time. Accurate time prediction of the corrections requires a dynamic model in which the process noise of the corrections has to be correctly specified. In this contribution, we present an estimation method to determine the process noise variance of PPP-RTK corrections using single-receiver GNSS data. Our focus is on variance estimation of the first-order slant ionospheric delays, which allows one to analyze how the ionospheric process noise changes as a function of the solar activity, receiver local time, and receiver geographic latitude. By analyzing 11-year GNSS datasets, it is illustrated that estimates of the ionospheric process noise are strongly correlated with the solar flux index F10.7. These estimates also indicate a seasonal variation, with the highest level of variation observed during the spring and autumn equinoxes.
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Data availability
The GNSS data are accessible from https://cddis.nasa.gov/archive/gnss/data/ and https://data.gnss.ga.gov.au/. Likewise, the orbit products are accessible through https://cddis.nasa.gov/archive/gnss/products/mgex/. The solar flux index F10.7 data are available at https://omniweb.gsfc.nasa.gov.
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Acknowledgements
The GNSS data/products are made available by the International GNSS Service (IGS) and Geoscience Australia. The solar flux index F10.7 data is supplied by the GSFC/SPDF OMNIWeb interface. All this support is gratefully acknowledged.
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PSN and AK initiated the concept and the framework. PSN conducted the analysis and wrote the main manuscript text. All the authors reviewed and edited the manuscript.
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Sadegh Nojehdeh, P., Khodabandeh, A., Khoshelham, K. et al. Estimating process noise variance of PPP-RTK corrections: a means for sensing the ionospheric time-variability. GPS Solut 28, 43 (2024). https://doi.org/10.1007/s10291-023-01577-4
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DOI: https://doi.org/10.1007/s10291-023-01577-4