Comparative Performance Analysis of Anti-Jamming Methods in the GPS L1 Band

Abstract

Global Positioning System (GPS) signals in the L1 band are inherently vulnerable to both intentional and unintentional jamming because of their low received power levels. In this study, the performance of three different adaptive filtering algorithms is investigated against five representative jammer types in a GPS L1 receiver employing a single-element patch antenna. The considered jammer types include continuous-wave, swept, pulsed, wideband, and Binary Phase Shift Keying (BPSK)-modulated interference. The evaluated algorithms comprise the Least Mean Squares (LMS), Recursive Least Squares (RLS), and Adaptive Notch Filter-based approaches. Simulation-based assessments are carried out in terms of signal-to-noise-and-interference ratio improvement, bit error rate, convergence speed, and computational complexity. The results indicate that each algorithm offers distinct performance advantages depending on the characteristics of the interfering signal.