An Algorithm for GPS Anti-Jamming Based on Improved Fast ICA

In the practical environment, it is difficult for the user receiver to get DOA information of GPS signals in advance. In this paper, on the basis of blind source separation (BSS) theory, a signal-separation-based GPS antiinterference algorithm is proposed. In accordance with BSS process modes, wavelet denoising algorithm is first adopted to restrain the influence of noise on separation algorithm. Then, improved FastICA separation algorithm is adopted to separate the mixed signals. Finally, secondary wavelet denoising algorithm is used to restrain the amplified noise and GPS signal anti-interference is realized. The test shows that: the anti-interference algorithm proposed in this paper is effective. Under the same SNR, the algorithm has better anti-interference effect than traditional separation.