Research On Key Technology Of Plasma-based Microwave Staring Imaging

Our research group conducted a long-time deep exploration on the new system radar of microwave staring imaging.The super-resolution experiment with microwave staring function was realized for the first time,and a microwave staring imaging method based on plasma wave-front modulation was proposed.The core idea of the imaging system is to achieve uncorrelated wave-front modulation by controlling parameters such as the shape and dielectric constant of the plasma modulator.Using the modulation of the plasma to form a random distribution of electromagnetic waves in space before the radar echo signal is received.After data analysis,the precise orientation of the integrated incoming wave signal in the main lobe of the radar is obtained,so that we can use the resolution model to achieve precise resolution of multiple targets in the main lobe of the radar.The resolution of the existing radar system is improved in fundamentally.The main work of this paper is to study the key technologies and experimental verification of plasma-band microwave staring imaging theory in different bands.According to the experimental data,the cylindrical plasma modulation made by our group has a certain amplitude and phase modulation capability for microwave signals.Our group built the experimental platform to verify the experiment in the Ku band.In the experimental scene of 20 meters×10 meters,the azimuth resolution of 0.15 meters is achieved,which is equivalent to the antenna aperture shrinking by more than 100 times under the same resolution.It greatly breaks the resolution limit of the existing high-resolution radar.And set up an automatic test system to complete the data acquisition and processing,complete the image update rate of 10Hz(0.1s / frame).The advantage of L-band radar is that it can detect stealth targets compared to radar in other band.Therefore,the experimental verification of the microwave staring imaging theory in the L-band is carried out in this paper.Firstly,a parallel-coupled micro-strip band-pass filter is designed for the complex electromagnetic environment near the L-band in free space.A new plasma modulator was built to build an L-band experimental verification system platform,in the experimental scene of 20 meters×10 meters,the azimuth resolution of 0.25 meters is achieved.The microwave staring imaging theory was verified in L-Band application.In order to develop the application of the system in the radar field and realize the development process of the system from the principle verification system to the simulation prototype,this paper designs a new system radar receiver prototype system,and developed a receiver and four-channel acquisition system jointly with the Institute of Electronics of Chinese Academy of Sciences according to the design requirements.Then build a system to data measurement and analysis.Our research team will further develop the application of the new system microwave staring imaging system in the radar field based on this new system.