Spaceborne Synthetic Aperture Radar (sar) Raw Echo Data Simulation Study

Synthetic Aperture Radar (SAR), as a high resolution microwave instrument, has an important status in the remote sensing. It has ability of large planetary image areas in all weather during day and night and has to a thing some wear deeply ability, these characterise cses make it very important in applied aspect, particularly in the military realm became increasingly extensive application, so we must carry on countermeasures to the military detection from the space to the ground. The main research of this dissertation are based on the Spacebome SAR raw echoed data's simulation, does some work to the effect in the system valuation for the Electronic Countermeasures (ECM) of SAR in advance, hope it do a meaningful quest and researches on Spacebome SAR ECM's realm. The main research and contribution of this dissertation are:1 , According to the opposite sport regulation of spacebome SAR and targets on the ground, in this dissertation, we reject the sphere earth model and circle satellite orbit model, set up the more accurate mathematics model and algorithm to solve distance from spacebome SAR to the targets on the rotary Earth's surface in each time under ellipsoidal earth model and elliptic satellite orbit model and offers more precise geometric relation for Spacebome SAR raw echoed data's simulation.2, In this dissertation, we make imaging processing to Spaceborne SAR raw echoed data of point target and make range migration correction during the azimuth processing. And an optimum method of producing the azimuth reference function based on polynomial model is brought out; the result of imaging processing testified the doppler parameter's estimation is very correct and studied the influence of noise to the Spacebome SAR raw echoed data.3, In this dissertation, we take range time domain pulse coherence to simulate the distributed target's raw echoed data and make rough imaging processing to the raw echoed data. When magnitude of coefficient of electromagnetic wave's back reflect satisfy Rayleigh distribution and phase satisfy uniform distribution, we studied the influence of noise to the Spacebome SAR distributed target's raw echoed data.