Combined algorithm for interference suppression and signal acquisition in GNSS receivers

Signal acquisition has become the performance bottleneck of global navigation satellite systems (GNSS) receivers in harsh interference environments due to its low sensitivity. In this Letter, a novel anti-jamming algorithm based on the minimum mean square error criterion is proposed to protecting the acquisition stage. The key idea behind the proposed method is that the grid search process of synchronisation parameters is shared by both interference suppression and signal acquisition. Simulation results indicate that the proposed method is capable of maintaining the functionality of GNSS receivers at cold start in the presence of interfering signals. In addition to this, its performance outperforms the power inversion method significantly.