Analysis Of Anti-interference Performance And Design Implementation Of Cognitive Frequency Hopping System

Frequency hopping communication is widely used in military communications due to its strong anti-interference ability,ease of multi-access networking and superior security.However,with the rapid development of modern information technology,the increasingly complex electromagnetic environment,complex and variable interference and the dramatic increase in communication equipment have brought great challenges to traditional frequency hopping communications.Cognitive Frequency Hopping communication introduces Cognitive Radio into frequency hopping communication.It is considered to solve the problem by realizing the channel electromagnetic environment information in real time,analyzing the channel spectrum situation and dynamically optimizing its own parameters so as to improve the system's anti-interference ability and reliability.One of the effective ways in which frequency hopping systems face challenges.Analysis and quantification of cognitive frequency hopping communication anti-interference ability can provide theoretical basis for the system's anti-jamming gain,and can be used as the technical support for optimizing system parameter configuration.Therefore,this paper mainly analyzes the anti-interference performance of conventional frequency hopping systems and cognitive frequency hopping systems,deduces the BER calculation formulas for cognitive frequency hopping systems with different interference patterns,and gives the recognition of cognitive frequency hopping systems.Know the anti-jamming gain,in addition to the design and implementation of the cognitive frequency hopping system and the development and design of the system software platform,verify the cognitive frequency hopping in the actual system testing has stronger anti-interference ability than the conventional frequency hopping.The main research content is as follows: 1.Analyze and simulate the anti-jamming performance of conventional frequency hopping systems under audio interference and blocking interference.The structure of cognitive frequency hopping system is studied,and the system's interference situation generation,link rounding mode and generation of frequency hopping sequence are analyzed.2.Focus on the anti-jamming performance of cognitive frequency hopping system,fully consider the effects of interference size,spectrum sensing false alarms and missed alarms on system performance,and derive the system's bit error rate in audio interference,narrowband interference and partial band interference.The formula is calculated and verified by simulation.3.Compare the anti-jamming performance of conventional frequency hopping and cognitive frequency hopping,and propose cognitive frequency hopping cognitive anti-jamming gain,and give the calculation formula.The proposed cognitive anti-jamming gain,as a parameter index to measure the performance of cognitive frequency hopping anti-jamming,provides a theoretical basis for maximizing the anti-jamming performance of cognitive frequency hopping systems and optimizing the configuration of system parameters.4.Based on the design requirements of cognitive frequency hopping system,the interference situation analysis module of the design system software platform is developed to analyze and visualize the interference situation,and verify and verify the cognitive frequency hopping communication in the actual system as compared with the conventional frequency hopping.Stronger anti-interference ability.