Research On Multi-waveform Radio Composite Detection Signal Processing Method

In order to better cope with the increasingly complex electromagnetic environment,this thesis takes the three systems of linear frequency modulation,frequency agility LFMCW,and pseudo-code phase modulation time division multiplexing radio detectors as the research object,focusing on improving the system detection ability and anti-jamming performance.The research is summarized as follow:(1)Aiming at the frequency agility LFMCW system,combined with the selection criteria of the frequency hopping sequence,the Logistic chaotic sequence based on square matrix reconstruction is used as the frequency hopping sequence.For the linear frequency modulation and frequency agility LFMCW system,the phase difference spectrum correction method based on ap FFT is used for distance and speed measurement.The simulation results show that this method has high measurement accuracy.(2)While realizing the distance and speed measurement of the pseudo-code phase modulation system,using the method based on convex optimization,combined with the minimum peak sidelobe level filter design criteria,directly construct the mismatch filter.Simulation result shows that this method can be very good at suppressing the distance sidelobe of the pseudo code phase modulation system.Aiming at the Doppler sensitivity problem of the pseudo-code phase modulation system,a Doppler compensation method based on ap FFT is used.The simulation results show that this method has the advantages of high compensation accuracy and large compensation range.(3)The anti-jamming performance and methods of the multi-waveform detection system against typical active noise AM interference,noise FM interference and repeating deception interference are studied.The simulation results show that under different interference types and interference parameters,the anti-jamming to lerances of the three systems are different.In the case of less interference types,the detection results of the three systems can be combined for joint judgment.(4)Designed a multi-waveform radio detection signal processing module,and completed the realization of modulated signal generation,Cordic algorithm-based ap FFT,matched filtering,CFAR and other algorithms on this platform.The algorithm was verified through actual measurement and hardware-in-the-loop simulation.