Bandwidth Optimization of Carrier/Code Tracking Loops in GPS Receiver
نویسندگان
چکیده
Global Navigation Satellite System (GNSS) is the standard generic term for satellite navigation systems that provide autonomous geospatial positioning with global coverage. As of 2007, the United States NAVSTAR Global Positioning System (GPS) is the only fully operational GNSS. Based on bandwidth optimization criterion, the GPS receiver is proposed for solving the carrier/code phase tracking problem. Tracking is the part of the baseband signal processing. The carrier phase tracking loop, the frequency tracking loop, and the code tracking loop are the main three tracking loops in receiver. The architecture of the tracking loops are analyzed and designed with respect to thermal noise and dynamic stress errors. The noise bandwidth in the tracking loop is the most important parameter. The optimization method of noise bandwidth is developed in GPS receiver to provide a better tracking performance. Simulation results show that our proposed method can not only reduce the thermal noise influence but also keep locking in reasonable user dynamic. Keywords-Global Positioning System (GPS), tracking loop, optimal noise bandwidth
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