Research On Techniques Of SAR Jamming And Jamming Effect Evaluation

Synthetic aperture radar is a kind of imaging radar with characteristics of all-weather,day/night and long range,which could provide high-resolution image.It has the capability of imaging and recognizing the territorial targets,which made it widely used in either military of civilian fields.Since synthetic aperture radar has prominent performances and many advantages,the SAR jamming technology and the evaluation of jamming effect have been more widely respected.Based on the basic theory of SAR imaging,the thesis focuses on the jamming methods and the evaluation of jamming effect.Firstly,the theory of SAR imaging is studied,the target echo theory model and target rebuilding analyzed,and then the imaging simulation is made based on Range-Doppler algorithm and Chirp Scaling algorithm.The jamming equation of SAR is given.Considering the difference of processing gain,some coherent jamming methods,which including Radio frequency noise jamming,noise FM jamming,noise phase modulation interference and incoherent jamming methods,which including three type of frequency_modulated jamming are discussed.According to the jamming type,the correlated simulation is made.Based that,some evaluation methods are described,including methods based on image quality,methods based on the relevant measure and the methods based on information entropy.Then starting form the human visual system,an evaluation method based on edge structure similarity is proposed.According to the different edge detection operator,the structural similarity indicators based on gradient edge detection and based on the Laplace transform are proposed,and the assessment indicators are simulated.