Research Of Multi-system Navigation Receiver Baseband Algorithm

With the construction of GNSS(Global Navigation Satellite System)including GPS,Galileo,GLONASS and Beidou,more and more attentions are paying to the domain of research and development of receiver that can be compatible.with every kind of GNSS.This article carries out detailed study and design work,and the main contents include the following aspects:(1)Taking the GPS signal for example,analyze and simulate the generation structure,autocorrelation function features and spectral characteristics.Then summarize the capturing and tracking scheme to make foundations for following chapters.(2)According to different characteristics of each new signal system,adopt a kind of algorithm based on autocorrelation functions rebuilding to eliminate multimodal influence in receiving.The improving of capturing thresh calculation strategies.(3)Devise a kind of receiving channel that can be configured.Processing different system information from software,modules in each channel such as PRN generation module,carrier frequency NCO module and accumulation module can be changed to receive signal from different GNSS.And improve the satellite allocation strategy of multi-system receiver to achieve more efficient capturing.(4)In the end,through the GNSS signal generation device and hardware development system,debug and verify the design of this paper.