A Novel Multipath Estimation algorithm in GPS Receivers under adverse conditions

چکیده

The multipath problem still persists in GPS receiver under challenged conditions. The multipath occurs in the GPS receiver due to several reasons may be in the form of recian when LOS present and Rayleigh fading environment when the absence of LOS. In this paper, three multipaths are simulated in the model of Jakes fading simulator and the paths are estimated using the SParse based Singular Spectral Analysis technique (SPSSA). This technique estimates the amplitude and the angle of arrival of the path by converting the raw GPS as a sparse signal then applied the rank-based reduction in the acquisition stage of the GPS receiver. The simulation results confirm the effectiveness of the proposed method by determining the visible satellites in the CAF (Carrier Ambiguity Function) and determines the code phase and doppler effect in precise manner.