Research And Implementation Of Anti-jamming Algorithm For Nine-array-antenna Array Antena

In varous fields,the global satellite navigation system is widely used.However,the transmission distance of the navigation signal is far away,which makes the received signal power is very low.At this time,the navigation signal is easily affected by electromagnetic radiation and human interference,which can not work normally.In order to solve this problem,researchers at home and abroad are committed to the research and improvement of anti-jamming technology.So,the research of anti-jamming technology of navigation system has become the focus of research in related fields.The anti-jamming algorithm based on array signal processing is widely used in the navigation anti-jamming system.Anti interference technology of digital multi beam is one of the key technologies in array signal processing,the main content of this paper is in the nine array antenna on the basis of the research on anti jamming algorithm of digital multi beam based on FPGA,and realized according to the anti-jamming algorithm research results of good performance.First of all,this paper introduces the possible interference and the commonly used anti-jamming technology in the satellite navigation system,and points out the advantages of digital multi beam technology in the field of anti-jamming technology.Then we introduce the array model and the principle and the common rule of adaptive beamforming.Then we introduce the partial array model of the nine elements,and introduce the digital multi beam anti-jamming algorithm based on it.Based on the MATLAB of digital multi beam based on LMS(least mean square),RLS(recursive least squares)and SMI(sampling matrix inversion)three kinds of anti jamming algorithm have been simulated,the simulation results show that the SMI algorithm based on digital multi beam compared to other algorithm has better anti-jamming performance,and the algorithm in the realization of computation than other algorithms.Then we introduce the overall structure of the navigation anti-jamming system,and introduce the implementation scheme of the SMI algorithm based on digital multi beam in FPGA.Then,each module of the algorithm is designed and implemented in FPGA,and the functional verification of each module is carried out by using the joint simulation of Modelsim simulation software and MATLAB simulation software.Finally,the whole algorithm module is compiled in Quartus II software,and it is proved that the algorithm can be realized.Then this paper introduces the FPGA implementation of the spatial spectrum angle measurement,and introduces the design process of the guide vector module in detail,and introduces the principle of the CORDIC algorithm.Finally,the paper summarizes the full text work,and points out the shortcomings and methods of improvement.