New publication by Lyu et al. (2023)

Correcting slant ionospheric delays is crucial for achieving fast convergence in PPP-RTK. However, the interpolation performance depends on many factors, such as time, elevation, and distance. Lyu et al. investigated the performance of three interpolation algorithms, i.e., inverse-distance weighting (IDW), radial basis function (RBF), and Kriging under different ionospheric conditions. A mathematical model between the uncertainties of different interpolation methods as a function of time, elevation, and distance are built. In positioning domain, a convergence time within 2 minutes and positioning accuracy within 3.5 cm in horizontal and 6 cm in vertical directions are achieved using the strategy of functional uncertainty. 

Find the full article here: external page https://ieeexplore.ieee.org/abstract/document/10319354