Research On Imaging Algorithm For Missile-Borne SAR Based On Anti-jamming And Simulation

Synthetic aperture radar is a new type modern active electromagnetic wave imaging radar. It uses the the principle of synthetic aperture and technique of pulse compression and microwave remote sensing to acquire high-resolution two-dimensional radar image on full day and full-weather as its operating theory. The thesis demonstrate the research results of the anti-jamming SAR computing, which are reported below:1. Study on the missile-borne SAR imaging algorithm. This dissertation studies the geometric model of missile-borne SAR in different stages, analyses the expression of instantaneous slant distance based on the model and produces ideal SAR image by using the ideology of Principle of Stationary Phase and series inversion to produce the missile-borne SAR imaging algorithm that has passed the simulation using matlab.2. Study on the method of the interference against missile-borne SAR imaging. Based on the missile-borne SAR algorithm, new types of interference which are interpulse subsection shift-frequency jamming, randomly-shift-frequency jamming and stepped shift-frequency jamming created by fixed shift-frequency jamming processing to the missile-borne SAR imaging with the adding of the echo model of the fixed shift-frequency jamming. The effectiveness of the interference is proved by the simulation using matlab.3. Study on the method of anti-jamming missile-borne SAR imaging.Based on the method of the jamming to the missile-borne SAR imaging, the anti-jamming is achieved by the technology of jittering of chirp rate polarity to shift-frequency jamming with the improvement of jamming capability using method of jittering of chirp rate polarity combined with amplitude limitation under high jamming-to-signal ratio.The effectiveness of the anti-jamming is proved by the simulation using matlab.4. Design and complete the software of missile-borne SAR system simulation. The missile-borne SAR system simulation software has good portability resulting from the super computing ability and the visual programming ability of the joint programming through Matlab and Visual C++, gets rid of the dependence of matlab environment.The summary of the research context and workings of this dissertation, with the shortcomings of the process of the research and the recommendations in the following workings.