Research On Methods And Implement Of Radar Signal Adaptive Channelized Reception

The digital channelization technology based on the software radio theory has the advantages of frequency bandwidth monitoring,full probability reception,reconfigurable signal and signals easy to system processing and analysis,which is often applied to radar reconnaissance receivers.The signals received by the radar reconnaissance receiver are usually non-cooperative signals,lacking priori information,which leads to the blindness of channel division when designing digital channelized receivers.There may be crosschannel risks when receiving radar signals.In this paper which combines specific project,based on the traditional channelized radar receiver,an adaptive channelized radar signal receiving methods are proposed.The main work completed includes the following aspects:1.The signal processing procedure and working characteristics of the current radar reconnaissance receiver are analyzed,and the radar signal reconnaissance problem in complex electromagnetic environment is modeled and analyzed.In view of the limitations of current radar signal reconnaissance and reception,the adaptive requirements of radar signal reconnaissance are studied from multiple angles,and an adaptive channelized radar signal reconnaissance and receiving system architecture based on the spectrum sensing technology of complex electromagnetic environment is presented.The spectrum sensing technology senses the current electromagnetic environment,provides frequency domain information for adaptation,and adaptively selects the most suitable channelization structure to complete channelization processing by analyzing and determining the spectrum.2.The spectrum sensing technology of complex electromagnetic environment is studied.For the demand of adaptive channelization structure,the spectrum sensing technology based on short time Fourier transform(STFT)is studied.It is simulated and verified,and a spectrum information detection and optimization algorithm is given according to the characteristics of spectrum information.This method can quickly complete spectrum detection and data processing,which is conductive to realize.3.The theory of digital channelization technology is studied in detail.The highspeed signal acquisition theory and channelization prototype structure are briefly studied.Combined with the uniform signal channel division methods,an efficient implementation method of digital channelization based on polyphase filter structure is derived.The digital channelization based on guided filtering is studied,and its implementation is optimized.The characteristics of the two channelization methods are compared.The problem of signal cross-channel in channelization is studied,and adaptive channelized reception is realized by dynamic multi-level channelization structure.4.Combined with the above research work,the implementation of the adaptive channelization radar signal receiving method is studied in detail.The sub-modules of adaptive channel matching algorithm,multi-level channelization structure,spectrum sensing and signal detection are introduced in detail.The block diagram and implementation method of sub-module system are given,and the FPGA simulation implementation is completed to verify the system effectiveness.