Design And Implementation Of Non-uniform Dynamic Channelized Receiver Based On Cognition

The wideband digital channelized receiver has a wider processing bandwidth and a higher probability of interception,and thus has become an important part of electronic reconnaissance equipment.The existence of cross-channel wideband signals will lead to signals distortion of wideband digital channelized receiver.Traditional non-uniform dynamic channelized receiver does not have adaptive detection capability,and it is difficult to construct non-uniform dynamic filter bank quickly and efficiently.The application of cognitive processing can effectively improve the efficiency of non-uniform dynamic filter bank construction.This paper mainly studies the design and implementation of non-uniform dynamic channelized receiver based on cognition in non-cooperative signal environment.Firstly,the basic theory of wideband digital channelized receiver is studied.Based on the theory of digital channelization,the basic filter bank structure and polyphase filter bank structure are studied,and the polyphase filter bank is optimized and improved.The uniform channelization structure based on polyphase filter bank is suitable for pre-processing the signal.The subsequent processing of channelization is studied,including Coordinate Rotation Digital Computer(CORDIC)to measure amplitude and phase,instantaneous frequency measurement and channel decision,and it provides Subband Spectral Distribution Information(SSDI)of signals for cognitive channelization.Then,in order to improve the efficiency of non-uniform dynamic filter bank construction,the efficient structure of non-uniform dynamic channelization based on cognition is studied on the basis of SSDI,and the cognitive channelization model based on searching and updating the dynamic knowledge library is established.Based on the model,the design flow of non-uniform dynamic channelization based on Frequency Response Masking(FRM)is analyzed,and the efficient structure of non-uniform dynamic channelization based on cognition is proposed.Three channelization algorithms including non-uniform dynamic channelization based on subchannel reconstruction technology,non-uniform dynamic channelization based on FRM technology and non-uniform dynamic channelization based on cognition are used to simulate the average consumption time in terms of detecting the single signal.The simulation results show that the efficient structure of non-uniform dynamic channelization based on cognition can accelerate the construction of non-uniform dynamic filter bank and has adaptive detection capability.Finally,the FFT module,the filter module,the CORDIC module and the cognitive channelization are implemented in Field-Programmable Gate Array(FPGA).The function simulation is performed by the Modelsim SE simulation tool,and the simulation results are analyzed and verified.The algorithm implemented by the simulation is transplanted to the hardware based on FPGA,and the board level debugging and data waveform recording and analysis are performed.The hardware implementation of the non-uniform dynamic channelized receiver based on cognition is completed In the radar signal generator,the signals of different modulation methods and frequency domin parameters are used as input signals to test three channelization algorithms,and the test results are compared and analyzed.The experimental results fully verify the advantages of the proposed efficient structure of non-uniform dynamic channelization based on cognition in improving the efficiency of non-uniform dynamic filter bank construction.