Study Of SAR Deceptive Scene Jamming Method

As the resolution of SAR(Synthetic aperture radar) system increases rapidly, it plays an increasingly important role in defense technology. In order to prevent the enemy radar to get our important military information, grasp initiative on the battlefield, Research deception jamming SAR scenes with high fidelity are particularly important. Current SAR deception jamming can only generate jamming signal with low degree of similarity. Therefore, it has great significance for a modern defense technology to in-depth analysis of the scattering characteristics and the texture feature of SAR images and research SAR scene deception jamming of textures combined with target.This thesis firstly introduces the basic principles of SAR and deception jamming mechanism, analysis the characteristics and the basic feature of SAR images, achieve a simple deception jamming through simulation. Then deception Jamming is been compared with other modes of jamming to find their own characteristics, the difficulties to achieve deception jamming is been analyzed.Then the thesis analyze the statistical distribution model of SAR scene, introduces the parameter estimation method and inspection criteria of statistical model, select several typical SAR scenes and experiment about statistical distribution to get the best statistical model different scenes, lastly, according to the best statistical model to reproduce the typical scenes.Then in order to generate a high degree of similarity of deception scene, based on the model of SAR image, the texture synthesis method of typical SAR image and the scattering center model including the parameter estimation are been analyzed. This thesis introduces the synthesis method based on the pixel and synthesis method based on block mosaic respectively. Then the best choice between the two methods is selected to synthesis several different types of SAR scene. After that, On the basis of properties scattering center model and its parameter estimation method, scattering centers of typical military targets have been extracted, on this basis, a method of SAR deceptive scene jamming is been proposed, in which the jamming scene is formed by the texture and scattering centers, based on deception jamming mechanism and imaging algorithm, SAR scene deception jamming is achieved through simulation.Finally, the influence of some typical parameters error on the effectiveness of deception jamming is been studied. Through theoretical analysis and simulation experiment was concluded that: center frequency error causes position offset of false targets in the distance direction; FM slope error causes the false target defocusing, the main lobe broadening, main lobe peak fall; Doppler slope error and platform speed error will result in position offset of false targets in the azimuth direction.