SAR Anti-jamming Based On Waveform Design

Synthetic Aperture Radar (SAR) is a kind of new imaging radar. High-resolution radar image can be obtained by using SAR under all weather, day and night and long distance conditions. It has high value in military and civil applications. It is a research emphasis of SAR. The jamming and anti-jamming of SAR is a hotspot of the research of SAR in the latest years. The research is the martial mystery of every country, so the correlative news is very lack. In this paper, I research the anti-jamming of SAR.Chap 1, Introduce the development and theory of SAR, and the jamming and anti-jamming at present. Analyze the means of some jamming and anti-jamming. Concludes that the anti-jamming methods are disability of suppress terrain scattered jamming.Chap 2, To suppress the terrain scattered jamming for SAR, analyze the anti-jamming method of random initial phase and Polarity of chirp rate jittered of the transmitted LFM pulses. The output signal-to-jamming ratio is enhanced by making the jamming not get all the gains of range and azimuth matching filers. The amount of sampling is more and anti-jamming performance is well in a synthetic aperture. Simulation results testify the anti-jamming performance of this method.Chap 3, Corresponding to the SAR to get the information of main lobe jamming and suppress terrain scattered jamming, analyze the anti-jamming method based on jittering orthogonal codes and random initial phase. Orthogonal pulse code at neighbor slow-moment leads to disability of jamming to get coherent match filtering gain of range direction, at the same time, random initial phase at each slow-moment leads to disability of jamming to finish azimuth match filtering. The code amount is more and anti-jamming performance is well. Experiment testifies the ability of this method to suppress jamming from the directions of range and azimuth.Chap 4, To suppress the terrain scattered jamming for SAR, a anti-jamming method by annexing initial cube-phase is proposed. This paper proposes the anti-jamming method based on jittering orthogonal codes and initial cube-phase, polarity of chirp rate jittered and initial cube-phase. Simulation results testify the anti-jamming performance of this method.Summarization, summarize this paper.