Research On Inverse Design Of SAR Radar System And Realization Of Typical Target Modeling And Simulation

Synthetic Aperture Radar（SAR）is a kind of radar that can perform long-range highresolution imaging of detection targets or areas.The carrier of SAR radar is generally an aircraft or a satellite in space.According to the common types of radar carriers,it can be simply divided into spaceborne SAR and airborne SAR.The development of SAR radar can be traced back to the 1950 s.So far,many countries have developed many classic spaceborne and airborne SAR radar systems.The study of the classic SAR radar system is of great practical significance for the development of new SAR satellites,airborne systems and anti-SAR reconnaissance technology.Due to the outstanding advantages of SAR,it is often used in the military field to detect and identify specific targets,such as aircraft,ships,vehicles,and airports.The detection and identification work usually requires the support of target model libraries.Based on the above research issues,the main research contents of this thesis are as follows:（1）The inverse design research of the classical SAR radar system is carried out.Taking the airborne SAR system P3/SAR and the spaceborne SAR system SIR-A as examples,other parameters required for system simulation are calculated according to their published and obtained working parameters;The design parameters of other SAR radars are estimated for reference.Based on the above parameters,the imaging simulation of the set target is carried out by the SAR radar system obtained by the inverse design,and the imaging results obtained by the simulation are discussed and summarized.（2）The echo modeling of typical SAR radar targets is studied.Mainly for aircraft（including transport aircraft and fighter jets）,vehicles（including tanks and armored vehicles）and ships（including aircraft carriers and destroyers）military targets,combining their actual size structure and their real SAR radar image characteristics,establish scattering points Echo model,the established model is simulated by SAR radar system imaging processing,and compared with their real images,a more accurate target echo model is established.（3）Based on the TI AWR1642 radar sensor,a series of synthetic aperture imaging experiments were carried out.The measured data acquisition and imaging processing of the real target are carried out in the real scene,and the whole process of the SAR radar system from transmitting signals to receiving data to reading data and finally imaging is verified,and the images obtained from the measured data are compared and discussed.