Interference Mitigation in Tracking Loop of GPS Receiver based on Adaptive Filtering

Spoofing has vital role in distorting Global Positioning System (GPS) signals. In this paper, a plenary anti-spoofing approach based on adaptive filtering is proposed to diminish spoofing effects. The suggested method can be easily implemented in tracking loop of GPS receiver. An adaptive filter based on the least mean square has been developed for estimating the genuine parameters of counterfeit signal. As a primary step, the proposed technique is implemented in software receiver to prove the concept of idea in a multipath-free scenario. Three rooftop data sets, collected in our GPS laboratory, are used in the performance assessment of the proposed method. The results indicate that investigated algorithm is able to reduce the miss-adjustment of steady-state positioning up to 80 percent.

Keywords:

Adaptive Filter , Spoofing , GPS Receiver , Tracking Loop