| The research on radar interference and suppression methods is an important part of radar electronic warfare field.With the continuous innovation of radar system,the research on radar interference technology and interference suppression technology has also made continuous progress.The two technologies promote each other and develop together.In this thesis,based on pulse radar and combined with actual engineering projects,the performance of different active interferences on pulse radar is explored by means of mathematical modeling,simulation analysis and engineering implementation,and the interference suppression method is studied and improved.Finally,an arbitrary waveform generator which supports menu selection,parameter setting and waveform output is designed and developed based on the research results of active interference.The arbitrary waveform generator designed and developed in this thesis can realize the waveform output of radar target echo and active interference,which makes the function of radar signal simulation instrument more perfect.It is of great significance to the construction of major domestic scientific research instrument projects.This thesis mainly includes the following three aspects:1.Based on the pulse radar system,the interference performance of suppressive interference and deceptive interference on the pulse radar is studied.Firstly,a pulse radar platform is built.The mathematical models of radio frequency noise interference,noise amplitude modulation interference,noise frequency modulation interference and noise phase modulation interference in suppressive interference are established,and the difference between spectrum characteristics and statistical characteristics is analyzed by simulation,through which the best scenarios of different noise interferences are determined.Then the mathematical models of dense false target interference,range gate drag interference and speed gate drag interference are established.The interference process and interference mechanism of different deceptive interferences are simulated and analyzed.Finally,taking the pulse radar as the jamming object,the interference effects of suppressive interference and deceptive interference on pulse radar are determined through the signal processing results and target movement trajectory,and then an effective interference scheme for pulse radar is made.2.For two types of active interference,adaptive sidelobe cancellation technology is used to suppress the suppressive interference in this thesis,and an improvement is made on the basis of the traditional scheme.The multipath problem is solved by adding delay section and the cancellation ratio is improved.Moreover,the raw data is used for verification and comparison.The sidelobe blanking technology is used to suppress deceptive interference,and the blanking threshold is set to suppress deceptive false target.The experiment results show that the technology has a significant effect on deceptive interference.3.Based on the target echo model of pulse radar and the research results of active interference,a high performance arbitrary waveform generator is designed and developed.The arbitrary waveform generator adopts WPF architecture design and Lightning Chart graphic control,and can simulate the output of active interference and target echo.The menu selection,parameter setting and waveform output of arbitrary waveform generator are demonstrated by mouse keying.The test results show that the arbitrary waveform generator performs well with clear visual effects and strong human-computer interaction.It can output radar echo,clutter,interference and other signal waveforms with corresponding parameters according to user needs. |
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