Investigation of Suitable Geometry Based Ionospheric Models to Estimate the Ionospheric Parameters Using the Data of a Ground Based GPS Receiver

The field of Navigation has been revolutionized with the advent of Global Positioning System (GPS). As GPS is a satellite based navigation system, transmitted GPS signals are affected by the refraction in the atmosphere which causes huge error in pseudorange information of a satellite. Of all the layers of the atmosphere, ionosphere is one of the major sources of error in ranging measurements, which reduces the accuracy of the navigation solution. Hence in this paper, in order to estimate the ionospheric parameters such as Total Electron Content (TEC), range delay and time delay, geometry based ionospheric models are investigated. The dual frequency receiver data of an IGS station, NGRI (Lat/Long:17°24′39″N/78°33′4″E), Hyderabad, Andhra Pradesh, India, provided by Scripps Orbit And Permanent Array Center (SOPAC) is considered for a typical day of 11th September 2014.