Research On Phase-coded Stepped-frequency Signal Processing Technology Based On Integrated Architecture

With the development of weapons and equipment,the detection of high-speed targets has gradually become the main task of early warning radar.In traditional narrow-band radar,when the range and velocity are ambiguous,the echoes of each period fold up to make the clutter increase,which is not conducive to the detection of high-speed targets.As a synthetic wide-band signal,the phase-coded stepped-frequency signal has the advantages of no range ambiguity and no clutter folding.At the same time,integrated integration is the development trend of special aircraft mission systems.The universal waveform design based on phase-coded stepped-frequency signal,integrated process design,and verification under integrated architecture are the main research contents of this thesis.The thesis studies the basic form and characteristic of phase-coded stepped-frequency signals,and shows the signal high-resolution through the signal's ambiguity function diagram.Based on this signal,a generalized waveform signal is designed,which can be used as a shared signal for radar and communication.In this thesis,the processing steps of phase-coded stepped-frequency signal are analyzed in detail.High-resolution processing is performed from two dimensions of range and velocity.In the velocity dimension,FFT processing is processed at the same frequency point;and in the range dimension,IFFT processing is processed according to the target speed of the output representative channel.In order to obtain a complete range image,the results are extracted,and finally the target's range-speed two-dimensional high-resolution image is obtained.In order to solve the impact of moving targets on imaging,this thesis analyzes the velocity compensation method of the target and proposes a spectrum peak estimation method to improve the accuracy of the compensation.For the universal waveform signal,the characteristic of the signal is studied,the design of the signal processing flow is completed,and the function of the radar and communication is realized through simulation processing,which provide support for the comprehensive design.Finally,the design idea of the integrated architecture is proposed in this thesis.The integrated radio frequency system is designed,which can realize wide-band transmission and reception,and meet the needs of radar,communication,ESM and other functions.The phase-coded stepped-frequency signal and the universalwaveform are tested and simulated by an integrated system,which can prove the feasibility of the system and the excellent properties of the signal.The theoretical simulation of the signal and the comprehensive verification of the system are realized.