Acquisition And Anti-Interterence Technology Research And FPGA Implementation Of Gnss Receiver

With the growing demand of location based services, the application demand of GNSS receivers under strong interference and weak signal conditions have initiated a research upsurge of the high sensitivity receiver technology. High sensitivity capture technology improves the processing gain of the receiver. Therefore the receiver can capture some weak signals and interference signals instead of traditional receivers.This paper mainly studies the acquisition algorithm of GNSS receiver and the anti-jamming technique in the interference environment. Based on the understanding of capture principle, code phase and frequency parallel fast search acquisition algorithm and some other proposals that can improve the sensitivity of capture technology have been proposed. After verification experiments been conducted, those proposals finally applied to real situations on our GNSS receiver. This paper mainly introduces and studies on the contents of:Firstly, a complete introduction to the structure of GNSS and the composition and characteristics of the satellite signals. Then it introduces hardware and software architecture of the GNSS receiver and its main modules.Secondly, it proposes the time-frequency search method of "multi matched filter+FFT" through the research of acquisition algorithm. Then it gives analyses of the performances, detection strategy, the function and parameters of acquisition modules. Finally introduces the external interfaces with other module in engineering implementation.Thirdly, it introduces various kinds of interference environments and the suppression methods. The article mainly focused on the study of narrowband interference and repeater jamming, and then proposed the anti-interference technology.In the last, according to the proposed technologies studied above, the article gives an implementation of FPGA design and the simulation experiments with the simulated and actual signals.