Influence and Dependent Parameters of Terrain Undulation to Bistatic SAR Imaging

As the Doppler history depends both on the transmit range and the receive range in bistatic SAR, those targets, who have the same bistatic range but different locations, will have different doppler history. So the unknown terrain undulation will cause defocusing in bistatic SAR imaging. This paper firstly analyzes which parameters in bistatic configuration affect the defocusing severely, and then shows the simulation results to testify the analysis. Besides, it points out the 3D imaging ability (though very weak) of bistatic SAR based on the defocusing phenomena. And Finally the 3D imaging results are also exhibited.