Research On Broadband Fast Frequency-locked Signal Source Technology

Frequency-hopping communication is widely used in many communication systems with its excellent anti-jamming performance and excellent spectrum utilization.Correspondingly,with the application and development of the system,more serious challenges are presented to the jamming system.Based on this,this paper presents a new structure of comb spectrum signal source with high speed jump and completes the design of the system based on theoretical calculation,simulation and experiment debugging and analysis.This structure according to dwell time interference theory and sacrifice the interference suppression time ratio to improve the interfering efficiency of Frequencyhopping communication system,achieves a purpose that can disturb the Frequencyhopping communication system with lower power.The system combines the frequencyhopping signal source with the comb spectrum generator to form a new signal source system.The signal source can reach the broadband coverage of 150MHz~18GHz,which can produce a fast-jump comb spectrum signal.Therefore,it can be used as a source of interference signal to the frequency hopping signal and the adjustable comb signal source.This paper first introduces the background and significance of the system,as well as the development status and research contents.Then embarks from the system level is introduced the structure of this design.In this paper,the main indexes of the evaluation system and the design parameters of the system are presented.The system consists of two main modules: frequency hopping signal source module and comb spectrum generator module.The overall adopts modular cascade design,according to the circulation order of frequency,frequency hopping module contains crystals module,the phase-locked loop module,direct digital frequency synthesis module,comb spectrum module contains power amplifier module and comb spectrum signal generator module.This paper expounds two big modules respectively to order index requirements of the various components of the support theory,at the same time introduced from the formula deduction,simulation,optimization,debugging and results analysis of every step of the design process.Finally,the whole system is tested and analyzed.From the experimental results,the system can complete the preset plan better.It can realize the wide frequency hopping and locking of 150MHz~18GHz,so that it has abundant frequency point output and realize multi-frequency coverage in frequency range.After testing,the system's frequency hopping rate is below 1,which enables it to cover more points in the same time dimension.The minimum output signal power of the system in the output frequency band is-36 dbm @18GHz,and the preset index requirement is realized.Finally the results of the experiment data are analyzed,and puts forward the existing problems,causes and further improvement measures,at the same time this paper has a vision of a new architecture design which may form from its design conception.