ANALYSIS OF RAYLEIGH VERSUS RICIAN MULTIPATH FADING MODEL IN GPS SIGNAL

Περίληψη

Global Positioning Systems (GPS) plays a vital role in day today life by providing a reliable and robust worldwide positioning for the increasing demand of precise positioning services. The RF signals transmitted by GPS satellites causes signal degradation due to interference, noise and fading affects the receiver leads to poor receiving positioning performance. The, Multipath fading is currently the major and largest error source. The channel between transmitter and receiver is affected by absorption, reflection, refraction, diffraction, and scattering. They are greatly affected by the ground terrain, the atmosphere, and the objects in their path, like buildings, bridges, hills, trees, etc. These factors lead to the fading of the transmitted signal and poor positioning accuracy of satellites. In this paper, different fading models are compared and also incorporation of indoor and outdoor propagation model in GPS signals based on the channel conditions are simulated and it is analyzed on the software GPS receiver.