Spaceborne Synthetic Aperture Radar Target Signal Simulation Technology

Spaceborne Synthetic Aperture Radar(SAR) has evolved to satisfy a variety of applications for both civilian and military users with its fine two-dimensional resolution capability and possibility of day/night operation in all weather. Obviously, to explore the Spaceborne SAR raw data simulation techniques will be helpful to test the Spaceborne SAR systems.This dissertation includes the following parts:1. Based on the facet model, a method of the simulating of Spaceborne SAR raw target dates with random distribution is proposed. The simulating algorithm is given and the results are analyzed.2. Based on the Spaceborne SAR theory, an elliptical earth model and an elliptical orbit model are proposed, which have some advantages over the traditional circular ones.3. The algorithms for generating Spaceborne SAR raw signals are explored. A time domain method of the simulating SAR raw target signals is presented firstly, which can simulate accurately raw dates but burdens upper computational complexity. Therefore, a frequency domain method with lower computational complexity is also proposed.4. Based on the theory of Kirchhoff approximating and the model of Franceschetti facet field simulating, an algorithm for the computing the facet backscatter coefficients is presented. Especially, the second part of the computing the backscattered field is given.5. The desired signals of point targets, point array targets and three-dimensional targets are simulated and analyzed respectively. The simulating results show that the methods proposed can estimate correctly the SAR characteristics.