Design And Implementation Of GNSS Anti-Jamming Receiving System

With the development and application of global satellite navigation system,satellite navigation has become an indispensable part of modern society,and is applied more and more extensively in precision guidance,modern warfare,special operations,aerospace,automotive navigation,timing,surveying and mapping et.al.However,the satellite signal becomes very weak when it reaches the ground,it is susceptible to all kinds of interferences,thus affecting system operation.Therefore,research and development of anti-jamming receiver technology is of great importance and in urgent need.The primary purpose of developing anti-jamming receiving system by increasing the anti-jamming capability is to ensure the reliability and validity of the military command and weapons guidance systems.Anti-jamming receiving system will play an important role in high-tech military field in the future,so it is very important for the development of anti-jamming system.In this project,GNSS jamming receiving system is launched and developed according to the actual needs.This paper chose Beidou satellite navigation system as research object,we analyzed the satellite receiving system structure,summarized the main types and characteristics of interferences.According to the effect of interference on the Beidou satellite navigation receiver system,this paper completed schematic,circuit,PCB design about antenna,RF section and the baseband section,and test the whole anti-jamming receiving system.The RF section of system mainly consists of down-conversion module and the up-module.The paper analysed each part of RF module.According to the actual environmental requirements,we proposed main parameters of each module,selected the appropriate device,carried out a detailed circuit design for each module,and then draw schematics and finish summary PCB board.The results from the actual test confirmed the feasibility of the design scheme.Then,we introduced the ideas and processes about the baseband section design based on FPGA chip.In the baseband section,eight parallel AD were used to achieve IF signal acquisition,Cyclone V FPGA family was used as a data processing unit,and two parallel DA were then used to achieve conversion from the digital signal to the analog signal.Finally,the circuit debugging of the baseband board was finished.The actual test results demonstrated the system meets anti-jamming satellite receiving system performance requirements.