Fast Acquisition Algorithm And Implementation Of B1C Signal

B1C signal is disclosed as a new global service signal due to the successful networking of beidou-3 satellite navigation system.More and more people pay attention to its advantages of high positioning accuracy and strong anti-jamming ability.B1 C signal belongs to the new system navigation signal,its signal format is very different from the traditional navigation signal,so the traditional navigation signal synchronization method is no longer suitable.Signal acquisition is the first step in the baseband signal processing of navigation,and its acquisition algorithm directly affects the performance of the whole receiver.Therefore,it is of great practical value to design a fast acquisition algorithm for B1 C signal and select the appropriate hardware platform to verify the algorithm.On the basis of summarizing the traditional navigation signal acquisition algorithms at home and abroad,this paper reviews the structural characteristics and acquisition algorithms of the new system signals,analyzes the characteristics of B1 C signals,designs a fast acquisition algorithm of B1 C signals,and implemente the algorithm on the zynq hardware platform,The main work is as follows:1)Firstly,the formats and characteristics of BOC and MBo C modulated signals are analyzed,and then the components of B1 C signals are analyzed in detail.Then,the acquisition principle of navigation signal and classical acquisition algorithm are studied one by one,and the acquisition algorithms of BOC Signal of new system are combed on the basis of existing ones.Finally,the accuracy of algorithm,search time and complexity of implementation are compared.2)After summarizing the existing algorithms,a fast acquisition algorithm based on four parallel partial matched filter and fast Fourier transform for B1 C signal is proposed.The pilot component of the signal is captured,the number of segments and the number of FFT points are given.The gain after integration and the determination of the acquisition threshold are analyzed.3)The algorithm is implemented on the platform of ZYNQ.In the PS part,software design of capture strategy with C language;in the PL part,modules are divided according to the algorithm,and describe the circuit with Verilog language.4)The simulation signal source is designed and logically connected with the whole acquisition system,which establishes the foundation for the algorithm verification.The functions of the system are verified by using the signal acquisition and observation tools provided by vivado and writing simulation files.The verification results show that the algorithm is correct and feasible,and meets the requirements of fast acquisition algorithm.