Analytic modeling and three-dimensional imaging of downward-looking SAR using bistatic uniform linear array antennas

The bistatic configuration of linear array with one central antenna element for transmitting and the other antenna elements of linear array for receiving is introduced in downward-looking SAR for three-dimensional imaging in this paper. The geometrical model and the received signal model of downward-looking SAR using bistatic uniform linear array antennas are established. The analytic expression of three-dimensional imaging results is derived and the resolutions in three dimensions are given. This paper presents the image formation and analyzes the simulation results based on this 3D imaging concept.