engleski

Comparison of TEC Models

Demands from civil and army sector on precision of Global Navigation Satellite Systems (GNSS) are continuously rising. However, there are several factors which can introduce a positioning error. Particularly ionospheric error can cause one of the biggest errors (10-100m) when not properly mitigated. A significant part of the error can be easily removed using two or more frequencies due to the dispersive nature of the ionosphere. However, as most of GNSS receivers are still single frequency receivers, they have to use a ionospheric model to mitigate ionospheric errors. Although there are several models of the ionosphere, they are not thoroughly efficient under all conditions. Therefore, further study of ways how to improve existing ionospheric models is required, especially now, when the Sun’s activity peak is anticipated. Training Research and Application Networks to Support a Mitigation of Ionospheric Threats (TRANSMIT) is a project focused on variable topics dealing with the influence of the ionosphere on GNSS performance. Our research is inquired into ionospheric single frequency mitigation techniques during different space weather conditions. This paper will present the results of the comparison between the global TEC (Total Electron Content) map provided by Space Weather Application Center - Ionosphere (SWACI) of German Aerospace Center (DLR) and the values modelled using the new DLR ionospheric model NTCM, models IRI 2011 and NeQuick2 and data of F10.7 solar flux during the year 2011.

IRI 2012; NeQuick2; SWACI; NTCM

nije evidentirano