Simulation Research On Time Domain Echo Of Broadband Radar Target Based On Forward Modeling

With the development of radar systems and computer technology,the role of simulation in the research and development of radar systems has received increasing attention.Compared with the full physical field experiment,the simulation technology is easier to control and the experiment can be repeated,so more comprehensive and effective data can be obtained.As the front-end work of radar system research and development,radar echo signal simulation and simulation play an important role in the radar system development process and in the further processing of data.Therefore,it is a very practical and valuable subject to deeply study the echo simulation technology of radar targets.This paper mainly studies the time-domain echo simulation method of broadband radar complex target based on attribute scattering center model.The main idea is to treat the broadband radar complex target as a system,the system function of the system is the electromagnetic scattering characteristics of the target,and the radar echo signal is the output of the transmitted signal after passing through the target system.At the same time,the attribute scattering center model is used to describe the electromagnetic scattering characteristics of the target,and the radar echo signal model under the excitation of different radiation sources is constructed.After simulation analysis and comparison with the high-frequency prediction method,on the basis of ensuring that the physical meaning of the results is clear,the problem of large calculation amount of the high-frequency simulation method in broadband radar applications is solved,thereby verifying the accuracy and efficiency of the method in this paper.The specific research content starts from the following aspects:1 ? Briefly introduce the theory of electromagnetic scattering in the high frequency region of complex targets.Calculate the primary scattering field of the target based on the physical optics method,and realize the high-frequency prediction of the secondary and multiple scattering fields of the target by combining with the geometric optical method;during the calculation process,the target bin decomposition and the secondary illuminated surface are studied The method of determination;based on the RCS results of the target's own structural analysis and simulation,to achieve the description of the target's electromagnetic scattering characteristics.2?Study the forward modeling process of the complex target attribute scattering center model.First,the spatial ray tracing diversity technology is used to screen the strong scattering sources of complex targets,and then the attribute scattering center model is used to describe the characteristics of the target.The positive determination method of relevant parameters in the model is mainly studied,and finally the strong scattering of the target to be studied is output.Source sequencing results,and analyze the scattering characteristics of the same target under different incident conditions.3?Theoretical modeling of time-domain echo signals of complex radar targets.On the basis of studying the characteristics of different types of radar emission signals,the conversion of target electromagnetic scattering characteristics in the time-frequency domain is analyzed,and a time-domain echo signal model of broadband radar complex targets based on attribute scattering centers is constructed.4?Simulate and analyze the echo signals of typical complex targets.Use the extracted attribute scattering center model to describe the electromagnetic scattering characteristics of the target,and simulate the time-domain echo of the target under the step frequency signal,ultra-wideband electromagnetic pulse signal and chirp signal,and compare the processed echo with the previous high The comparison of frequency prediction results verifies the effectiveness of the proposed method based on the attribute scattering center model to obtain the target time-domain echo.