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The Software Defined Radio (SDR) technology, applied to the reception of Global Navigation Satellite Signals (GNSS), allows the implementation of a positioning device with a high flexibility level. The advantage is twofold: not only the GNSS SDR receiver can be easily updated during its operational life, but it becomes an outstanding tool in prototyping innovative algorithms for signal processing...
In this paper, the structure of a tracking loop with Extended Kalman Filter (EKF) is analyzed. Particular emphasis is given to the NCO update rule, which is seldom mentioned or studied in previous literature. Furthermore, the structure of an EKF-based software receiver is proposed including the special modules dedicated to the initialization and maintenance of the tracking loop. The EKF-based tracking...
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