Research On 3D Radar Simulating System And Time Series Planning Of Radar Countermeasures

With the development of simulation technology and communication technology,a radar network simulation system has been continuously evolving;in the front display,two-dimensional(2D)images becomes inadequate to real demands,such as variation of parameters in simulation process,intuitiveness of simulation process,reality of realistic simulations.Therefore,simulation display also needs to convert from 2D images to three-dimensional(3D)images.In the back-end,existing radars often work in a fixed pulse repetition frequency and pulse repetition frequency staggering modes.The radar pulse repetition period is an important parameter for enemy passive detection equipment and for sorting radar transmit signals.Frequency jitter technology may increase the difficulty of re-frequency sorting,but it will produce high Doppler accumulation sidelobe level to affect the accuracy of target speed estimation.This paper studies a method of radar signal time sequence regulation to suppress the sidelobe meanwhile alleviate repetition frequency feature after resorting of the frequency and apply the algorithm to the echo data generation.This thesis mainly studies the realization of a 3D module at the front and the optimization of pulse generation at the end.First,the research background,significance and status of this project are introduced.The following mainly introduces the following six chapters:The first chapter briefly summarizes the domestic and foreign research status of the radar system based on existing information and the background about it.The second chapter mainly introduces the technology used in the radar simulation system,including the background part of the data processing,the parallel computing framework,and the scheme for the echo data generation.We also briefly describe the composition of the 3D scene about the front-end display.The third chapter mainly introduces main real requirements and technology stack for to construct a 3D simulation system,and expounds the technical principles and technical supports needed in the process of exploration.The technology of Geographic Information System(GIS)used in the simulation system to create a dynamic terrain is an innovative point.We also introduce five technical points for the system.GPU image processing technique realizes the light effect.Unity model operations simulates targets' movement.Network communications and thread communications simulate radar communications.How to build a suitable user interface to display better and package options.The fourth chapter,the front-end 3D view was displayed.The operation description of the display and the construction of the software' environment were briefly described.The fifth chapter,in order to improve the ability of anti-interception with radar pulse,we expand the traditional pulse coherent accumulation to random pulse repetition intervals.Finally,in order to alleviate sidelobe level increase an algorithm is propose to suppress sidelobe level after coherent accumulation through pulse transmission time optimization.There is a standard of min-max to suppress the sidelobe level after pulse coherent accumulation and the simulation results are given to evaluate and verify the performance.The sixth chapter is summary of the full text and the outlook for the future work.