Research On Adaptive Radar Target Simulation Technology Based On Spectrum Sensing

Electronic warfare is essentially a struggle for dominance of the electromagnetic spectrum.As a key technology in electronic warfare,radar target simulation technology is essentially to generate false target echo by using enemy radar waves to deceive and consume enemy radar.In order to realize high fidelity radar target simulation,the simulator needs to acquire the characteristic information of incoming waves fully through spectrum sensing technology.In the complex electromagnetic environment,the advanced spectrum sensing technology can automatically recognize the wave signature when facing the new type of composite modulated radar signal,so as to realize the radar target simulation by using the perceived information.Therefore,this thesis studies the adaptive radar target simulation based on spectrum sensing.The main research work includes:(1)The status quo of spectrum sensing technology and radar target simulation technology is reviewed,and the Electromagnetic spectrum sensing,analysis,configuration and forwarding principles in Electromagnetic Maneuver Warfare(EMMW)are learned.The agility of EMMW was analyzed from the perspective of Observe,Orient,Decide,Act(OODA)cycles.The key influence of spectrum sensing accuracy on EMMW agility was studied.In order to improve the accuracy of spectrum sensing,the timefrequency domain energy sensing technology is studied,and the algorithm architecture of adaptive radar target simulation based on spectrum sensing is built.(2)In order to further improve the fidelity of radar target simulation,the characteristic differences of conventional radar signals in Time domain,frequency domain and time-frequency domain are analyzed,and the radar signal modulation type recognition algorithm based on spectrum complexity and Short Time Fourier transform are studied.STFT spectrum sensing algorithm,combined with the mathematical model of radar signal to simulate and analyze the above algorithms.In this thesis,Fourier interpolation correction algorithm,fast solution linear frequency modulation algorithm and code rate estimation algorithm are studied.Based on the above work,high resolution radar target simulation algorithm is studied.(3)Simulation experiment and verification of adaptive radar target simulation algorithm based on spectrum sensing.The simulation of radar jamming scene is carried out,and the power evaluation method of the rotary jammer is optimized according to the simulation results.Constant gamma and normalized Radar Cross Section(RCS)clutter models are modeled respectively.Taking high precision and high grazing Angle ground detection radar as jamming objects,the process of radar and jammer confrontation is simulated,and the effectiveness of adaptive radar target simulation algorithm based on spectrum sensing is verified.In summary,by studying the factors affecting the accuracy of electromagnetic warfare spectrum sensing,this thesis proposes a method to improve the fidelity of target simulation,and verifies the feasibility of the adaptive radar target simulation algorithm based on spectrum sensing through modeling and simulation analysis,which provides strong support for electronic countermeasures,radar system testing and electromagnetic environment modeling fields.