Based On Software Radio Difference Frequency According To Link Communications Technology Research

The data link is the path of information transmission between different platforms.It is an important means to achieve platform integration and effective way.It is a seamless link between different platforms.In order to ensure the confidentiality and reliability of the transmitted data,the data link communication process is required to have high anti-intercept and anti-jamming capability.Frequency hopping is a typical spread spectrum communication system,which has been widely used in the field of data link communication because of its good anti-intercept,anti-jamming and anti-fading ability.The frequency hopping communication used in shortwave has many shortcomings such as low jump speed and low transmission rate,which can not meet the requirements of communication confidentiality and anti-interference.Differential frequency hopping technology uses adjacent jump signal frequency changes to carry information data.It can be achieved in the short frequency band high jump speed,with a stronger anti-jamming capability and higher transmission data rate.Based on the software radio technology,this paper designs and realizes the key module of differential frequency hopping data link communication,and provides the engineering foundation for the development of the differential frequency hopping communication prototype.It has strong practical significance.First,the data link and FM technology development are studied.On this basis,we focus on the differential frequency hopping signal generation and reception mechanism to analyze the differential frequency hopping frequency transfer function(G function)and frequency transfer resolution function(inverse G Function).The correctness of the generation,transmission and reception process of differential frequency hopping communication signal is verified by software simulation,which provides the theoretical basis for designing the key module of differential frequency hopping data link based on FPGA.Furthermore,based on FPGA,the ISE14.3 development environment is used to design and implement the functional units of differential frequency hopping communication.Using Modelsim6.5b,the key elements of the design are simulated and verified.Domain characteristics ofthe time and frequency of the signal are analyzed by the oscilloscope,which verifies the correctness and validity of the generation and reception process of the differential frequency hopping signal.