Efficient Electromagnetic Scattering Algorithm And Imaging Simulation For Target Response Of SAR

In recent years,synthetic aperture radar imaging is widely used the military area,and is also widely in the field of the remote sensing,environmental monitoring,topographic mapping and other closely related to the people.As a high resolution radar imaging technology,synthetic aperture radar(SAR)technology has gained wide attention because of its all-weather conditions.Specifically,the high resolution of the range is achieved by pulse compression of the echo signal signal by the radar receiver;good resolution for azimuth is achieved by a large virtual synthetic aperture.This paper uses an efficient algorithm of electromagnetic scattering to get close to the real radar data,Compared to the high frequency method,the full wave analysis method can get the radar scattering data needed for SAR imaging more fast,efficient and accurate,so as to verify the effectiveness of imaging algorithm.After studying the geometric model and echo signal model of SAR imaging,the real echo signal of radar is further simulated.After fully understanding the principle of the imaging algorithm,the back-projection algorithm with higher accuracy is selected as the core algorithm of this paper.The BP algorithm avoids Fresnel approximation in the imaging process,it only needs to calculate the position of the radar platform and the twoway delay between each pixel in the imaging area,so it can adapt to the composite control radar imaging in multiple modes.The electromagnetic scattering data was used for the geometric model and echo signal model,and then radar echoes were successfully recovered.The ship targets were further imaged.Satisfactory results are obtained,and the windowing and padding zeros in frequency domain are adopted to optimize the algorithm,so as to verify the algorithm of imaging.In the face of spaceborne high orbit SAR,it has the advantages of shorter revisit period,wider coverage area,wider surveying bandwidth,and stronger survivability,making its research an inevitable trend.This article analyzes and compares the high-orbit SAR and the low-orbit SAR,and give proposed solutions to faced with the challenges.