Multi-Channel Signal Detection Technology About HF Fast Frequency-Selection System Based On FPGA

HF communication system owns some unique advantages,such as low price,long communication distance,strong mobility,convenient networking,etc.,which make HF communication still have a place in the ever-changing communication camp via various communication technologies in some indispensable scenarios.However,HF communication also has some disadvantages.HF communication mainly relies on unstable atmospheric ionospheric reflection for radio wave propagation,which channel is a typical channel with multi-path propagation,discoloration,large fading and complex interference.Therefore,in the development of HF communication systems,factors such as self-adaptation and strong anti-interference ability become more and more important.The multi-channel signal detection technology studied in this thesis is a module in HF fast link establishment system developed by a project.Based on automatic link establishment technology,this system is currently applied to a HF communication device.Combined with the actual project requirements and performance indicators,the multi-channel signal detection technology in HF fast frequency-selection system is deeply studied in this thesis.There are two parts of research content,mainly including the related theory and FPGA implementation of multi-channel signal detection technology in HF fast frequency selection system.Firstly,the design scheme on multi-channel signal synchronization acquisition is given.The core content of the scheme is studied in detail,which is based on the sliding correlation FFT synchronization acquisition algorithm.The principle of the algorithm is derived theoretically and is simulated.The performance of the selected algorithm was tested.The results show that the selected algorithm performs well and meets the project's index requirements.In addition,other topics related to the design principle,such as frequency resolution and frequency offset estimation,spectrum sensing,etc.,are also introduced.Then,the related content on FPGA is introduced,and the design scheme of multi-channel signal synchronization acquisition is implemented on the FPGA platform.The structure, function and implementation details of each module about the implementation scheme are described in detail,then the design method and operation of each module is illustrated via FPGA simulation results.The spectrum sensing about HF communication systemis also given.At present,this implementation has been applied to a HF communication project with good performance.