Near Real-Time Ionospheric Modeling Using a Regional GPS Network

Details Near Real-Time Ionospheric Modeling Using a Regional GPS Network Near Real-Time Ionospheric Modeling Using a Regional GPS Network

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jass...22..283c&link_type=abstract

Journal of Astronomy and Space Sciences. Vol. 22, no. 3, 283-292

Astronomy and Astrophysics

Astronomy

Ionosphere, Gps, Total Electron Content, Space Weather

Scientific paper

Ionosphere is deeply coupled to the space environment and introduces the perturbations to radio signal because of its electromagnetic characteristics. Therefore, the status of ionosphere can be estimated by analyzing the GPS signal errors which are penetrating the ionosphere and it can be the key to understand the global circulation and change in the upper atmosphere, and the characteristics of space weather. We used 9 GPS Continuously Operating Reference Stations (CORS), which have been operated by Korea Astronomy and Space Science Institute (KASI), to determine the high precision of Total Electron Content (TEC) and the pseudorange data which is phase-leveled by a linear combination with carrier phase to reduce the inherent noise. We developed the method to model a regional ionosphere with grid form and its results over South Korea with 0.25° by 0.25° spatial resolution. To improve the precision of ionosphere's TEC value, we applied IDW (Inverse Distance Weight) and Kalman Filtering method. The regional ionospheric model developed by this research was compared with GIMs (Global Ionosphere Maps) produced by Ionosphere Working Group for 8 days and the results show 3˜4 TECU difference in RMS values.

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