| Radar high-resolution imaging is an important part of radar research.Since this concept was put forward,radar high-resolution imaging technology has always been a hot area of research by researchers at home and abroad,and it has also produced many impressive results.Synthetic aperture radar imaging and real aperture radar imaging are two common active radar imaging systems.According to the knowledge of radar signal processing,the azimuth resolution of the radar is closely related to the aperture size of the radar.The larger the aperture of the radar,the better its azimuth resolution capability.For synthetic aperture radar,the relative movement of the radar and the target is established to expand the aperture to form a large virtual aperture and to improve the resolution of the radar.Traditional synthetic aperture radar systems are mostly built on the basis of pulse radars.Such radar systems usually have a large size and are easily attacked and interfered.Moreover,due to their high cost,they have many limitations in application.In recent years,the small synthetic aperture radar system based on continuous wave radar has been widely used in civil applications due to its easy portability and low cost,and has been favored by researchers.This paper uses the fast SBL algorithm to study this type of synthetic aperture radar high-resolution imaging.The aperture expansion of the real aperture radar is to build a large antenna array,but this will cause the radar system to be too large and the cost to be too high,which is extremely unfavorable for application in real life.Synthetic aperture radar is an effective solution to this problem,but because synthetic aperture radar needs to establish the relative movement between the radar and the target,this will make it difficult to play a role in some special scenarios,so this paper proposes a distributed radar Imaging.The expansion of the radar aperture is achieved by flexibly splitting two radars on the sliding track to form a largeaperture virtual radar.The different positions of the radar control the size of the virtual radar antenna aperture.And by using MIAA to complete the missing data on the basis of a single radar data to complete high-resolution imaging.The main research content of this paper is the basic theory of continuous wave radar signal processing,synthetic aperture radar imaging theory and application,distributed radar imaging principle and application.The specific research content includes the following aspects:(1)Analyzed and introduced the practical significance of radar imaging,introduced synthetic aperture radar imaging,and then proposed distributed radar imaging by pointing out the limitations of synthetic aperture radar in certain scenarios,and introduced the research prospects of distributed radar imaging.(2)Continuous wave radar signal theory: including continuous wave radar system,chirp signal theory and simulation,continuous wave radar signal processing(target distance,speed,angle estimation),TI cascade imaging radar system research(including radio frequency board and data acquisition board).(3)Synthetic aperture radar imaging theory and application: built a complete set of small synthetic aperture radar imaging system,studied the theory and model of SAR imaging,studied CSA imaging method and fast SBL algorithm,and carried out the two algorithms in detail through formula derivation and software simulation,and then verified the correctness of the imaging system and the effectiveness of the imaging method through actual scene imaging.(4)Distributed radar imaging principle and application: built a distributed radar imaging system,studied the theory of distributed radar imaging,studied the MIAA method,and gave a detailed introduction to MIAA through formula derivation,and then introduced the distributed radar imaging data processing chain,and then through the corner reflector quantitative experiment to verify the effectiveness of the distributed radar imaging.Furthermore,the distributed radar imaging is further researched through the real-measured scene imaging of the parking lot. |
