Workshop 2018
Manual Hernández-Pajares - Looking for optimal ways to combine global ionospheric maps in real-time - October 29, 2018 • 30 Views
The increase in the availability of real-time (RT) GNSS receivers facilitates the generation of different RT global ionospheric maps (RT-GIMs) in the context of IGS affiliated institutes with different pros and cons and in a process of continuous improvement (Caissy et al. 2012, Roma-Dollase et al. 2016). This situation is similar as the one in 1998, which opened the way to generate postprocessed global ionospheric maps (P-GIMs). Indeed, the P-GIMs have been generated on daily basis uninterruptedly since June 1, 1998, with latencies of one day for rapid- and several days for final- ionospheric product (Feltens 2003, Hernández-Pajares et al. 2009). The independently computed GIMs of the different analysis centers, presently seven, have been combined thanks to a simple weighting scheme. It is based on the daily-global RMS obtained from the discrepancies between observed and modeled STEC changes (hereinafter O-C dSTEC) over a set of 15 receivers worldwide distributed. This approach has been working reasonably well for 20 years (Hernández-Pajares et al. 2017a, Roma-Dollase et al. 2018a). During previous IGS2017 workshop, different possibilities for adapting the postprocessing weighting scheme to real-time were initially discussed (Hernández-Pajares et al. 2017b). Despite that it will be very difficult to achieve a first combined IGS RT-GIM by IGS2018 workshop, this poster presents the progress on these efforts during the last year, including the recent study on the most discriminant elevation threshold in a simplified O-C dSTEC assessment (Roma-Dollase et al. 2018b).

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