The DSSS modulation is studied and its application in satellite based navigation system is presented. Brief details of GPS signal structure is presented. The need of code and carrier tracking loops in GPS is highlighted. Various architectures for code and carrier tracking loops are also presented. The derivations for transfer function of Costas loop for carrier tracking and Delay lock loop for code tracking is presented. The loop coefficients are determined by simulating various conditions. The loop functionality is tested with simulated test signal generated from AWR system simulation tool. Further the loop is tested.
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