Spaceborne Synthetic Aperture Radar Distributed Target Raw Data Simulation

Nowadays Spaceborne Synthetic Aperture Radar (SAR) is a focus of the research work in the remote areas because of its superiority. The Spaceborne SAR raw data simulator can simulate the echo of the radar, which could be used in the test of the new Spaceborne SAR system design.The dissertation thoroughly studies the distributed target's raw data simulation of Spaceborne SAR, the main contents of it are as follows:1. In this paper, a method of simulating of Spaceborne SAR in time domain is provided. Based on the facet model, the raw data with stochastic distribute are simulated successfully. A detailed algorithm of the simulator is given and the results are analyzed.2. To simulate accurate raw data of Spaceborne SAR, models of satellite with elliptical orbit and targets with rotation of the earth are adopted in the process of calculating between the satellite platform and target. And an optimum method of producing the azimuth reference function based on polynomial model is brought out, which has improved the azimuth compression effect successfully.3. Based on the theory of Kirchhoff approach and facet, the algorithm of computing the facets' backscatter coefficients is discussed. Especially a method of computing part of the backscattered field is advanced.4. Based on the raw data simulation algorithm, a method of developing distributed target's raw signal simulator of Spaceborne SAR is given. The raw signal simulator, which could generate the real-time echoes of distributed target, is divided into two parts: software and hardware platforms.I am sure the study of the distributed target's raw data simulation will have definite reference and applications value for the study of SAR system's design and imaging.