Design Of Channelized Parallel Digital Spectrum Processing Module

At present,with the rapid development of communication technology and military related technology,the various complex RF technologies are widely used.Traditional spectrum analyzer is difficult to detect complex signals.There is a "dead time" problem in the detection of RF dynamic signals and instantaneous burst signals.The real-time spectrum analyzer can process the signal with large bandwidth in real time,and analyze the signal comprehensively in time domain,frequency domain,modulation domain and other dimensions.Therefore,how to overcome the bottleneck of operation ability and improve the acquisition ability of real-time spectrum analyzer to instantaneous signal has become an urgent problem to solve.Among the relevant parameters of real-time spectrum analyzer,100% POI reflects the ability of instantaneous signal acquisition and analysis of the instrument,and the overlap rate of data processing directly affects the 100% POI parameters.Aiming at the problem of how to process high-speed data and improve the overlap rate and 100% POI index in the mode of large bandwidth real-time analysis,this paper proposes a design scheme of spectrum processing circuit based on ADC + FPGA hardware platform.Because the data rate of data frame overlapped processing is doubled,which exceeds the system clock frequency,this paper uses channelization algorithm to decompose broadband signal into multiple narrowband signals,and then uses parallel architecture variable overlapped frame module to carry out multiple overlapped processing,reducing the pressure of FFT module.Then the detection module combines the narrowband signal and output the final spectrum result.The realization of channelization algorithm mainly relies on register to control the multi-channel data delay,uses digital filter to complete the data calculation and decomposes the wideband signal into multi-channel processing.The FFT calculation process in the subsequent spectrum processing includes FFT module,mode calculation and logarithm transition.There are three detection methods,positive peak value,negative peak value and average value,including the detection processing based on ping-pong structure,the control of detection method and the combination of multi-channel spectrum results.In the process of system design and simulation experiment,VIVADO,MATLAB,Modelsim and other software are used to debug the system by using signal source,spectrum analyzer,oscilloscope and so on.The system index 100% POI reaches 10 ? s,and the acquisition and analysis ability of the system for short-time burst signal is verified.In the process of system design and simulation experiment,VIVADO,MATLAB,Modelsim and other software are used to debug the system by using signal source,spectrum analyzer,oscilloscope,etc.It is verified that the system index of 100% POI reaches 10 ? s under 100 MHz real-time analysis bandwidth,which improves the acquisition and analysis ability of the system for short-term burst signals.