Research On Carrier Frequency Hopping Technique Based On FPGA

In the battlefield environment dominated by information,communication almost determines the victory or defeat of war.And information warfare has become the mainstream of modern warfare.The traditional single-frequency communication method can not meet the requirements of electronic warfare.The frequency hopping communication is widely used in military warfare,for its strong anti-interference capabilities.This paper mainly studies the carrier frequency hopping technology.Owing to the defects of poor correlation,simple sequence and easy to be cracked of traditional frequency hopping sequence,chaotic mapping is used to generate random sequence,which further improves the confidentiality and security of communication.In order to better study the chaotic random sequence,the DDS signal generator is used to generate the carrier signal and the carrier signal is combined with the chaotic random sequence.Based on the basic principles and requirements of carrier frequency hopping technology,this paper constructs the overall scheme of the system,including hardware circuit implementation and software programming.The hardware circuit design is based on the platform of FPGA,which mainly includes the selection and configuration circuit of FPGA,DAC conversion circuit,low-pass filter circuit,LCD interface circuit and keyboard interface circuit in carrier signal module.The software programming is based on Verilog HDL assembly language and Quartus II platform.The software programming mainly includes carrier signal module and chaotic random sequence module.Carrier signal module mainly includes phase accumulator,waveform memory and key scanning and LCD display design.The chaotic random sequence module mainly uses double Logistic mapping to generate random sequence,then analyse the random sequence.Finally,DDS module and synthesized carrier frequency hopping module are simulated and tested on the experimental platform.The test results show that the system has good random performance,long period,good anti-prediction and low cost,which meets the design requirements.