Design And Implementation Of GNSS Receiver’s Baseband Signal Processing Module

The global navigation satellite system (GNSS)(GPS, Galileo, GLONASS,BeiDou (COMPASS)) would provide more available civil signals and more accuratePVT estimation. On one hand, more satellites in view would enable the user receiverto select the satellites with better geometric distribution to get a better Dilution ofPrecision (DOP). On the other hand, some GNSS civil signals adopted Binary OffsetCarrier (BOC) modulation which could provide the advantages of better codetracking performance, multipath effect reduction, and narrow band interferencerejection. However, there are two main problems in the design and implementationof multi-system GNSS receiver. Firstly, some signals adopt BOC modulation andthis would arouse the ambiguity problem in signal acquisition and tracking of BOCsignal. Secondly, multi-system GNSS receiver would consume more hardwareresources than conventional GPS receiver.In this thesis we tried to explore solutions to the two problems. To deal with theambiguity problem, we implemented the GRASS technique in our receiver whichcould effectively deal with the sine-phased BOC(kn,n) signal’s ambiguity problem.We devised an FFT based acquisition method to effectively calculate the testcriterion of the GRASS technique employs. In the tracking progress, we devised aPCF (Pseudo Correlation Function) based false lock detection technique andcompared its performance with Bump-Jump technique.To reduce the hardware consumption, we devised a universalconfigurable tracking channel module with which the receiver could tracksatellite signals of different systems. This channel architecture could reducethe channel numbers used in the multi-system GNSS receiver. We alsoemployed some other methods to reduce hardware resources. We implementeda multi-system GNSS receiver on an Altera development board.