Research And Implementation Of Satellite Navigation Signal Acquisition Algorithm Based On ZYNQ Platform

The successful global networking of Beidou navigation system marks that China ’s Beidou navigation system has officially become a member of the main global navigation system,and promotes the development of the global satellite navigation system industry.Satellite navigation and positioning plays an important role in daily life and work,but in high dynamic environments such as high-speed rail and aircraft,it is difficult for traditional navigation receiver hardware devices and acquisition algorithms to provide continuous and accurate services.The first step of the navigation receiver is acquisition,and the acquisition algorithm directly affects the final positioning performance.BeiDou-3B1C signal is an autonomously controllable new signal,and its signal structure and ranging code composition are quite different from those of other navigation signals.Therefore,it is of great significance to study the fast acquisition algorithm suitable for BeiDou navigation signal and realize it on the new navigation receiver platform.Based on the traditional navigation signal acquisition algorithm and the characteristics of BOC modulation signals,this paper designs a PMF-FFT acquisition algorithm combined with partial matching filter and FFT acquisition algorithm,and implements the algorithm on ZYNQ SOC platform.This paper introduces the principle of satellite navigation and positioning and the basic structure of GNSS signal,focusing on the structure and composition of Beidou B1C signal.Then,the development of navigation receiver is introduced,and a design scheme based on ZYNQ new platform architecture is proposed,which not only improves the signal detection probability but also reduces the share of hardware resources.Then this paper analyzes the basic principle of the navigation signal acquisition algorithm,describes three typical acquisition algorithms:serial search acquisition algorithm,matching filter acquisition algorithm and ASPeCT acquisition algorithm,and studies and analyzes them.It is found that the traditional acquisition algorithm is difficult to meet the requirements of Beidou B1C signal fast acquisition in high dynamic environment,and summarizes three main problems affecting the sensitivity of the acquisition algorithm.On this basis,the PMF-FFT acquisition algorithm is proposed to effectively improve the detection probability and Doppler frequency shift estimation accuracy,which is suitable for Beidou B1C signal acquisition in high dynamic environment.Finally,aiming at the problems of complex hardware design and slow internal transmission rate caused by the combination of ARM and DSP in traditional navigation receiver,ZYNQ new receiver acquisition board platform is selected to realize the algorithm in this paper.Because ZYNQ integrates PS(Processing System)and PL(Programable Logic)parts,it can realize hardware and software integration design and improve acquisition efficiency.Finally,the acquisition scheme of Beidou B1C signal is completed through the hardware design of VIVADO software.The results show that ZYNQ hardware scheme achieves the expected effect of capturing B1C signal,reduces the occupancy rate of hardware resources,and the average signal acquisition time meets the requirements of signal acquisition time in high dynamic environment,which has certain reference significance for the progress of Beidou navigation system.