BeiDou B1C Signal Data and Pilot Pseudocode Dual-Channel Joint Acquisition Algorithm

Abstract

AbstractBeiDou B1C signal utilizes binary offset carrier (BOC) modulation, which shifts the main flap of signal power spectrum density to both sides of the central frequency point, efficiently solving the problem of the spectrum resource constraint at the satellite signal frequency point, but the signal autocorrelation function of this modulation method has multiple peaks that will cause ambiguity at the capture stage. To address the above issues, this paper designs a data-pilot pseudo-code two-way joint acquisition algorithm that combines Pseudo Correlation Function (PCF) and non-coherent operation. The findings of theoretical research and simulations demonstrate that the dual-channel joint acquisition algorithm can quickly and accurately capture the B1C signal; In terms of acquisition performance, the algorithm is about 1dB better than the ASPeCT algorithm, and about 2.5dB better than the Filtered correlation algorithm; The algorithm achieves ambiguity-free capture of B1C signals and can preserve the narrow correlation peak characteristics of the correlation function of BOC modulated signals, ensuring accurate capture. The research in the paper has good applicability to BOC modulated signals and is of reference significance for related research on BOC modulated signals.KeywordsB1C signalBinary offset carrier modulationNon-coherent operationPseudo correlation functiondual-channel joint acquisitionUnambiguous