An improved segmented match filters with FFT approach for GNSS signal acquisition

In the GNSS navigation system, the acquisition speed of the pseudorandom code will impact the overall performance of the receiving system seriously. A rapid acquisition method of pseudo-random noise (PN) code is proposed, which is based on the segmented match filters (SMFs) with FFT algorithm. In this paper, the received signal sequence is averaged after wiping off the carrier, simultaneously several local PN sequences which have different code phase are overlapped. Theoretical analysis and numerical results show that the acquisition method can effectively improve acquisition speed.