Generation Of Navigation Signal And Research On Methods Of Acquisition

With the modernization and gradually developed improvement of GPS and otheremerging systems such as Galileo,"Compass II" satellite navigation system, the newsignal modulation technique is gradually replacing the old PSK-R signal modulationtechnique, and the BOC signal modulation technique emerged. The BOC modulationsignal has a significant characteristic spectral splitting, and it could be compatiblewith the original satellite navigation signals, while the navigation system could obtaina higher tracking accuracy and resistance to multipath interference. The BOCmodulation has the broad application prospects, when its synchronization technologyresearch attracted the attention of scholars at home and abroad.The main contents of this paper are as follows:1. It introduces the overview of international GNSS systems and researches severalGNSS signal modulation. The Galileo E1band and GPS L1band are focused, and itanalysis the CBOC signal modulation mode and TMBOC modulation of themodulation principle in-depth; With the focus of Galileo E5band, it analysis in-depthwith dual code AltBOC, standard AltBOC AltBOC and constant envelope modulationsignal the modulation principle.2. It studies the generation technology of GPS L1, GalileoE1and E5-band navigationsignal: with the mathematical derivation it produces GPS C/A code and GPS Weilcode and it simulates GPS L1band signal; it studies Galileo E1band signal, and withMATLAB simulation it realizes the E1band data channel signal and the pilot channelsignal; it studies the component,the spread code generation and the contents of thesub-carrier generation of Galileo E5band signal, and with MATLAB it simulatesthe Galileo E5signal.3. It introduces the traditional navigation signal acquisition method, analyzes thevarious navigation signal tracking accuracy and multipath error and focuses on theFFT-based acquisition algorithm based on matched filter with the theory andimplementation it studies parallel processing which of match filter algorithm and withthis method it completes the navigation for civilian GPS L1signal acquisition andcaptures the results.