Mark X?A Mode5 System Link Simulation And Research On Interference Suppression Technology

Anti-jamming techniques are designed to study the root causes of interference,the propagation paths of interference,and measures to suppress or reduce the effects of interference.In the battlefield environment,The weapons are more and more advanced,characterized by greater mobility and higher lethality.Human interference by the enemy can lead to low communication reliability.Using effective anti-interference technology is of great significance.Especially in the process of multi-service to multi-service cooperative operations,If the identification is correct,the enemy can be targeted and destroyed.Identifying mistakes will also prevent accidental injury to friendly forces.Therefore,based on the Mark X?AMode5 system,the research of the interference suppression methods for different types of interference has practical significance.This paper introduces the framework of the enemies' identification system,and the research status of single-tone,multi-tone,narrow-band and sweep-frequency interference.Suppression techniques concerning different interference types at home and abroad are also considered.According to different types of interference,the performance and improvement of various interference suppression algorithms are done.Single-tone and multi-tone interference is investigated,in relationship to the double-threshold interference suppression algorithm,based on time domain overlap windowing.The time domain overlap windowing technique and the double threshold interference suppression technique are combined to perform effective interference suppression after gathering interference energy in the spectrum.The paper simulates the interference suppression performance for different locations where the interference occurs.The results show that the closer the interference occurs to the edge of the main lobe,the better the interference suppression performance.For narrow-band interference,double-threshold interference suppression technology,differential interference suppression technology and three-threshold interference suppression technologies are analyzed and summarized,with the conclusion that many improvements have been made in the implementation process.Considering the spectrum leakage caused by the truncation of the signal,the received signal is overlapped and windowed before the interference is suppressed.According to the actual power of the Interference,different thresholds are tested according to the threshold used for interference suppression,Finally,the adaptive threshold is used.Finally,the implementation block diagram is given.By analyzing the simulation results,it is found that the double-threshold overlap windowing algorithm has the best performance.For frequency sweep interference,swept interference has the Characteristics of linear frequency modulation.Using this feature,the interference cancellation technology based on the MDCFT algorithm,the interference suppression technology based on FRFT and the interference suppression technology based on STFT are studied.Considering the complexity and precision problems in the implementation of various algorithms,DCFT has a large signal constraint.After the improvement,the MDCFT algorithm is adopted.In the interference suppression process based on the MDCFT algorithm and FRFT algorithm,in order to ensure the accuracy of the estimated parameters,this paper improves the operation method and uses two variable step sizes to reduce the complexity.Under the same simulation conditions,the interference suppression process based on the MDCFT algorithm performs optimally.