A 4D tomographic ionospheric model to support PPP-RTK
G. Olivares-Pulido (CRC for Spatial Information)
M. Terkildsen (Bureau of Meteorology Australia)
K. Arsov (Bureau of Meteorology Australia)
PJG Teunissen (TU Delft - Mathematical Geodesy and Positioning, Curtin University)
Amir Khodabandeh (University of Melbourne, Curtin University)
V. Janssen (NSW DFSI Spatial Services)
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Abstract
Successful implementation of integer ambiguity resolution enabled precise point positioning (aka PPP-RTK) algorithms is inextricably linked to the ability of a user to perform near real-time positioning by quickly and reliably resolving the integer carrier-phase ambiguities. In the PPP-RTK technique, a major barrier to successful ambiguity resolution is the unmodelled impact of the ionosphere. We present a 4D ionospheric tomographic model that computes in real time the ionospheric electron density as a linear combination of basis functions, namely B-splines. The results show that when the ionospheric estimates are provided as atmospheric corrections for a PPP-RTK end-user, the time to fix its horizontal position below 10 cm is around 20 epochs (the sample rate is 30 s) at the 90 % of the cumulative distribution function (CDF), as opposed to the time it takes when no external corrections are provided, which is around 80 epochs at 90 % of the CDF.