15:30 〜 16:30
[G06-P-07] Ionospheric parameters determination using integrated space geodetic data (case study: Iran)
Ionosphere is a layer of the upper atmosphere, between the thermosphere and the exosphere, distinguished because it is ionized by solar radiation. As an important part of human living environment, ionosphere affects our modern society in many ways, e.g. International broadcasters use this medium to reflect radio signals back toward the Earth. In last decade space geodetic techniques have turned into a capable tool for studying the ionosphere. Up to now, two dimensional models of vertical TEC have been widely developed and used by different communities; however, due to the fact that these models provide information about the integral of the whole electron content along the vertical or slant ray path, these maps are not useful when information about the ionosphere at different altitude is required.
This paper includes the extraction of ionospheric parameters from radio signals observed by various space observation techniques; i.e. Ionospheric Radio Occultations measurements from Low Earth Orbit satellites and observations from Global Navigation Satellite Systems (GNSS). Due to the commonly heterogeneous distribution of the data, the selection of suitable basis functions is an important issue. For this reason we applied B-Spline basis functions. B-Spline basis functions are used for longitude and latitude variations of the electron density and Chapman profile function for altitude variations. The required data for our investigation are ground based measurements of permanent GPS stations over Iran and radio occultation data from Formosat-3/Cosmic for region of interest.
The National Cartographic Center of Iran (NCC) has established a network of one hundred GPS stations: The Iranian Permanent GPS Network for Geodynamics. By integrating observations from various observation techniques, it is expected to have an increase in accuracy and reliability of final model of electron density.
This paper includes the extraction of ionospheric parameters from radio signals observed by various space observation techniques; i.e. Ionospheric Radio Occultations measurements from Low Earth Orbit satellites and observations from Global Navigation Satellite Systems (GNSS). Due to the commonly heterogeneous distribution of the data, the selection of suitable basis functions is an important issue. For this reason we applied B-Spline basis functions. B-Spline basis functions are used for longitude and latitude variations of the electron density and Chapman profile function for altitude variations. The required data for our investigation are ground based measurements of permanent GPS stations over Iran and radio occultation data from Formosat-3/Cosmic for region of interest.
The National Cartographic Center of Iran (NCC) has established a network of one hundred GPS stations: The Iranian Permanent GPS Network for Geodynamics. By integrating observations from various observation techniques, it is expected to have an increase in accuracy and reliability of final model of electron density.