1:30 PM - 1:45 PM
[G05-3-01] Higher Order Ionospheric modelling campaigns for precise GNSS applications
Within this project we also investigated the impact of I2+ on troposphere delay estimation, long-range relative positioning and autonomous positioning. We selected three networks (global, Polish and Brazilian) and three test period (each one week long, reflecting solar minimum conditions, solar maximum conditions and geomagnetic storm). We also estimated GPS and GLONASS orbit and clock products, that were further used in GNSS processing. We performed each processing in two variants 1) with original RINEX files, and 2) with I2+ corrected RINEX files, to assess the impact of I2+ effects on the results.
The initial analysis of I2+ impact on orbit modelling showed the following RMS of residuals: 1.1 mm, 3.7 mm and 3.3 mm for radial, along and out-of-plane component respectively. For troposphere, the average ZTD difference was -0.06 mm with 0.20 mm of standard deviation, with the extreme ZTD differences reaching 3.4 mm and -4.4 mm. ZTD differences obtained in Brazilian network fluctuates following daily I2+ correction oscillations. In Poland this effect is smaller, due to shorter baselines and lower ionosphere activity.