Research And Engineering Implementation Of Acquisition Algorithm On BDS-3 B1C Signal

With the rapid development of China's navigation system,from the first Beidou-1 system to the Beidou-2 system,and to the present Beidou-3 system,the Beidou navigation system already has the ability to serve the world.Beidou-3 system broadcasts several different satellite signals,among which,in order to be better compatible with other navigation systems,the B1C signal is broadcast on Beidou-3 system as a brand new signal.Baseband signal processing is the core technology in the GNSS receiver,which mainly includes the acquisition and tracking of the signal,and the effective acquisition is the premise of good tracking in the follow-up.To this end,this paper mainly studies the Beidou third generation B1C signal acquisition algorithm,and carries on the engineering implementation on the FPGA.This paper first introduces several new modulation techniques in satellite navigation systems,BOC modulation and MBOC modulation,and studies the characteristics of this modulation technique,autocorrelation function characteristics and power spectral density characteristics.Next,this paper studies and analyzes several acquisition algorithms for BOC and MBOC signals,and conducts detailed research on the principle of the algorithm.In order to determine the effectiveness of the verification algorithm,the simulation tool is used to fully verify the algorithm.At the same time,in order to get the B1C digital intermediate frequency signal of Beidou-3,this signal is generated on FPGA in combination with the characteristics of B1C signal.Finally,this paper successfully captures the Beidou-3 B1C signal in the development environment of Vivado 2016.4 using the design ideas from the top to the bottom layer.The RTL code was simulated using Modelsim as a simulation tool to verify the functionality of the individual sub-module functions.The final simulation results show that the acquisition algorithm designed in this paper can successfully acquire the B1C signal,which can be utilized in engineering and has good engineering utilization value.