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

With the development of global navigation systems,satellite navigation technology has become increasingly mature and has been rapidly popularized and applied in all aspects of production and life.However,in some specific application scenarios,such as high-speed rail,rocket and other high dynamic environments,ordinary navigation receivers are difficult to achieve the desired effect.Therefore,how to make the receiver achieve the ideal navigation and positioning effect in the high dynamic environment is currently the research of navigation technology important content.In the process of the receiver completing the navigation and positioning function,capture is one of the basic links.The efficiency of the receiver capture process will directly affect the working efficiency of the entire receiver.Therefore,the research and implementation of fast capture algorithms for satellite navigation signals is one of the current hotspots in high dynamic navigation technology research.In terms of the current problems of complicated receiver platform design with slow capture speed and large hardware consumption,this paper performs improvement and puts forward the following specific research work:1)For the matched filter rapid capture algorithm,the resource consumption is quite large,and the FFT parallel capture algorithm can not meet the requirements of rapid capture in high dynamic environment.A capture algorithm combining matched filtering and FFT parallel capture is proposed.Based on the theoretical analysis of PMF-FFT algorithm,the design scheme and MATLAB simulation of the algorithm are provided,and the good capture performance of the algorithm is verified.2)As for the current domestic receivers,most of them use DSP or ARM plus FPGA combination mode to bring about complex hardware design and high cost.The design scheme of using the heterogeneous architecture chip ZYNQ introduced by XILINX as the receiver core chip is proposed,which not only simplifies the hardware design of the receiver,but also reduces the resource cost.3)In view of the natural advantages of including both PS and PL in ZYNQ,an interface design scheme based on ZYNQ for software and hardware collaborative application is proposed.The interface of PS and PL is captured by ILA core to verify that the interface is function correctly and conforms.The requirements for use are also easy to apply.4)Using the communication interface between PS and PL as the software and hardware cooperation foundation,write the capture algorithm in PS,adopt the top-down design idea in PL,and modularly write the PMF-FFT capture algorithm as the core Capture scheme,including down conversion module,data pre-processing module,threshold decision module and other content.The simulation source is designed to output the simulated satellite signals,and the simulation files of the modules are written in combination with the hardware description language to verify the function of each module.After testing,it proves that the functions of each module are correct,and the overall requirements for rapid capture are achieved.