"Analysis of Ionospheric Error Estimation in L2 Frequency band for GPS"


Hiba Tabassum,B. Kiran Kumar (Associate Professor) & K. Muralidhar (Assistant Professor)
Lords Institute of Engineering & Technology, Hyderabad, India.


Global Positioning System (GPS) is a global navigation satellite system. It providessignal accuracy that helps in navigation. The system consists of 24 satellites (MEO satellite) revolvingaround the earth at an altitude of 20,200kms from the surface of the Earth. The satelliteorbits are inclined at an angle of 55 degrees with respect to the equator. The GPS systemhas 6 satellite orbits with each orbit consisting of 4 satellites. The GPS works in L1(1575.42 MHz) and L2 (1227.60 MHz) frequency bands. In this work, ionospheric delayand total electron content (TEC) will be computed for L2 frequency band. It is significantto compute the Ionospheric delay and TEC as Ionospheric delay is a major cause of errorin weakening of the signal. For analysis, MATLAB software is used and 24 samples areused which are obtained using National Geophysical Research Institute (NGRI) data.Vertical Ionospheric delay and TEC will be obtained and tabulated. The work will showthe performance of GPS signal accuracy with respect to ionospheric delay and TEC in L2band.