Research of Software GPS Receiver in Dynamic Environments
Weitao Tang · Jisuanji fangzhen · 2007
It is difficult for GPS receivers in dynamic environments to realize carrier tracking. A signal acquisition and tracking in a software GPS receiver was introduced. A new carrier tracking algorithm was put forward based on fuzzy logic controller and third-order phase lock loop, and the design process of fuzzy logic controller was analyzed, and the digital form of third-order loop filter suitable for software implement was proposed. Simulation results demonstrate that the proposed fuzzy-based loop achieves shorter settling time and noise bandwidth than the conventional tracking loops, and prevents the occurrence of cycle slipping.