Realization Of MUSIC Adaptive Anti-jamming Algorithm On FPGA

In recent years,the satellite navigation and positioning system has a wide range of use in military and civilian aspects,it plays an important role in national defense building and economic development.However,in general,the anti-jamming capability is still very limited,the research of the anti-jamming measures of satellite navigation and positioning system get more and more people's attention.In this paper,direction of arrival estimation(DOA)and the beamforming algorithm which is based on DOA are used to achieve adaptive anti-jamming.Due to the complexity of the algorithm,its hardware implementation is a difficult problem.Therefore,research realization of the adaptive anti-jam algorithm on FPGA has a very important significance.The major research in this dissertation is the adaptive anti-jam algorithm realize of the existing BD2 anti-jamming antenna system.Array antenna is a five-membered uniform circular array whose center has an antenna,and FPGA used the processor.The main missions are as follows:Detailed analysis of the structure of the antenna array,carefully studying the technology of DOA estimation,especially high resolution multiple signal classification(MUSIC)algorithm,studying the beamforming techniques based on DOA,laying a theoretical foundation for realization of the adaptive anti-jam algorithm on FPGA.According to the theoretical analysis,the overall implementation scheme and FPGA module division is designed.It gives the hardware implementation steps of correlation matrix module and spectrum peak searching module in MUSIC algorithm.Analyzing the real pretreatment included in correlation matrix module and verifying its feasibility.It gives the hardware diagram and specific operation of spectrum peak searching module.Detailed analysis of eigenvalue decomposition(EVD)module in MUSIC algorithm,discussing principle of eigenvalue decomposition of real symmetric matrix achieved by the cyclic Jacobi algorithm base on CORDIC,giving the hardware diagram and specific measures of EVD module,and verifying the application results of MUSIC algorithm with fixed EVD.Finally,this dissertation gives the hardware implementation scheme of beamforming algorithm.All of these hardware schemes are implemented by Verilog language to compile program,and conducted emulation,and verified its feasibility and effectiveness.For blanket jamming,it can use MUSIC algorithm estimated DOA of interference signal,and then use beamforming algorithm to form nulling in the interference signal,thus completing the interference suppression.