Research On The SAR Raw Signal Simulation Technology Of Three-dimensional Scene

As an active microwave remote-imaging system, synthetic aperture radar (SAR) characterized by the all-weather, day/night capability to generate a high-resolution representation of the targets over a long range, has applied in the field of military reconnaissance, the field of resource exploration and the filed of disaster watch. In the situation of new project designing, algorithm research and system validation etc, it needs some SAR raw signals of special parameter requirements, which can't be replaced by the data acquired by the flight trial. However, the technology of SAR raw signal simulation can solve this question.This dissertation, against a background of "XXX" of the equipment pre-research of "The Eleventh Five", investigates the backward methods and the forward methods of SAR raw signal simulation under nominal trajectory, and the SAR raw signal simulation under trajectory deviation, all of which are under the condition of three-dimensional scene.The backward methods of SAR raw signal simulation technology under nominal trajectory is studied. The method of backscatter coefficient calculating based on SAR images or optics pictures is analyzed. The algorithm suitable for backward method of SAR raw signal simulation is brought forward.The forward methods of SAR raw signal simulation technology under nominal trajectory is studied. The distributed target's backscatter model, the fractal interpolation principle and the facet model are analyzed. The method of backscatter coefficient calculating and geometric distortion phenomena simulating is put forward. According to SAR raw signal simulation of large terrain, the two-dimensional FFT algorithm is studied, and the algorithm of SAR raw signal simulation under complex terrain is ameliorated.The technology of SAR raw signal simulation under trajectory deviation is studied. The root of trajectory deviation is analyzed. The time-domain algorithm of raw signal simulation under the trajectory deviation is put forward. According to large terrain, the two-dimensional FFT algorithm is studied based on some assumptions of trajectory deviation, and the algorithm of SAR raw signal simulation of complex terrain under trajectory deviation is ameliorated.The production has been validated by the simulation of actual DEM data, which gets the ideal results.