Research On Range Imaging Jamming Technology For Wideband Radar Signal

With the competition for control of the electromagnetic spectrum in modern warfare,electronic warfare has gradually become the most important mode of warfare.With the rapid development of modern radar technology,various new types of radar are constantly emerging.Today ’s new system radar has good coherent signal processing technology and matching receiving ability,and can still have good detection and recognition ability in complex electromagnetic environment.Therefore,it is very important to study radar jamming technology that can cope with complex electromagnetic environment.In this paper,the radar one-dimensional range profile jamming technology is deeply studied.The range profile jamming algorithm suitable for different radar signals is designed,and its effectiveness is verified by a large number of software and hardware simulation experiments.Firstly,the jamming technology of range profile is studied for linear frequency modulation(LFM)signal model.The modulation method of the traditional one-dimensional range profile is simulated,and the interference effect of the interference signal is evaluated by the principle of constant false alarm detection.Then,from the perspective of hardware implementation,in order to solve the problem of interference signal lag in traditional modulation methods,a frequency-shift range profile interference algorithm is designed,and the method is theoretically analyzed and simulated.However,the frequency shift modulation method needs to measure the radar parameters in real time.Therefore,a range profile jamming algorithm based on spectrum spread and compression(SSC)blind frequency shift is introduced,and the hardware implementation flow of two range profile modulation methods is given.The function is verified by simulation software.The results show that both methods can achieve good jamming effect,which provides a reference for the hardware implementation of range profile jamming.Secondly,the new broadband signal of Hyperbolic Frequency Modulation(HFM)signal is studied.The mathematical model,time-frequency characteristics and Doppler characteristics of hyperbolic frequency modulation signal are introduced.The influence of fixed frequency shift interference and SSC blind frequency shift interference on hyperbolic frequency modulation signal is compared by simulation.A range profile interference method of HFM signal based on SSC blind frequency shift modulation is proposed and verified by simulation.The results show that the SSC blind frequency shift modulation method can also achieve range profile deception interference effect on HFM signal.Finally,the interrupted-sampling repeater jamming is analyzed.The influence of interrupted-sampling on hyperbolic frequency modulation echo signal is verified by theoretical analysis and simulation.A composite jamming modulation method combining interruptedsampling and segmented phase modulation is introduced.This method can slow down the attenuation amplitude of false target and improve the energy utilization of jammer by using different phase modulation functions.A range profile jamming algorithm combining interrupted-sampling and SSC blind frequency shift is designed.The simulation results show that the method has jamming ability to both radar signals,and can achieve deception and suppression jamming effect by adjusting the interrupted-sampling parameters.