Reserch On High-Speed Weak Target Detection Technology Of Pulse Doppler Radar

In recent years,countries have been vigorously developing missile defense systems for effective interception of various complex warheads.With the development of technology,the interception capability of its missile defense system has also been fully reflected.In order to effectively counter the missile defense system,countries are also stepping up research on missile anti-intercept technology,and the anti-intercept capability has been continuously improved.The key to avoiding the interception of the anti-missile system is to accurately measure the distance,speed and angle of the incoming interceptor target and the evading maneuvering missile in real time.Through the information fusion processing of the measurement results,the original ballistic trajectory is changed with the help of the control device,so as to avoid the interception of the anti-missile system.Although hypersonic weapons have extremely strong penetration capabilities and high speed and high maneuverability,they are difficult to be intercepted.However,with the gradual improvement of the enemy’s anti-missile system and the continuous improvement of interception elastic performance,it is still necessary to propose the anti-intercept technology of our army’s missiles.higher requirement.In Chapter 1,the introduction,starts from the task background of anti-interception and detection of threat targets,sorts out and summarizes the development status of hypersonic weapon platforms,enemy interception systems and high-speed small target detection technologies,and summarizes the development status of various fields in the future.The development trend is prospected.In Chapter 2,mainly introduces the top-level combat scenarios of anti-interception tasks and threat target detection,analyzes the deployment of typical combat scenarios and the performance of enemy threat targets,summarizes the requirements of the task,proposes improvement measures.In Chapter 3,the characteristics of the detected targets in the detection mission are analyzed in detail,and the simulation modeling is carried out through FEKO,and the electromagnetic scattering characteristics in different frequency bands are analyzed,and the available frequency bands are given.The background clutter environment is analyzed,and the basic characteristics of ground and sea clutter are obtained.In Chapter 4,mainly introduces the synthetic broadband pulse Doppler system.Firstly,the principle and advantages of the synthetic broadband PD radar signal system based on the stepped frequency signal are analyzed.Finally,the minimum detectable speed and operating distance of the system under the signal system are simulated and calculated by simulation experiments.In Chapter 5,mainly introduces the distance migration problem faced by high-speed weak targets in the process of coherent accumulation,and analyzes the performance loss caused by pulse pressure mismatch.The Keystone and Radon-Fourier methods are used for distance correction and coherent accumulation,and the signal-to-noise ratio improvement compared with the traditional MTD method is obtained.Finally,an improved fast RFT algorithm based on blind speed sidelobe effect is proposed to further reduce the computational complexity.In Chapter 6,mainly summarize the field test data.First,the test deployment and test methods are introduced.According to the post-event analysis of the echo data of different types of targets,the shortcomings of the existing radar system and signal processing strategies are obtained.Combined with engineering practice,the rapid accumulation algorithm and the synthetic PD signal system are used to improve the detection signal-to-noise ratio.