Abstract

In order to optimize the baseband signal processing algorithm of BeiDou Navigation Satellite System (BDS) software receiver and improve the accuracy of pseudorange measurement and positioning, the baseband signal processing algorithm is analyzed. In this paper, the delay lock loop (DLL) is adapted for C/A code tracking, and the frequency locked loop (FLL) assisted Costas phase locking loop (PLL) is used for carrier tracking. Moreover, the different PLL discriminators are analyzed in detail. According to the simulation results of the discriminators, the two-quadrant arctangent discriminator is selected as the phase discriminator in the Costas PLL for BDS receiver. The simulation results showed that the improved baseband processing algorithm can perform reliable tracking for BDS receiver baseband signal. Our work will be helpful to better understand and design of BDS software receiver.

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