Near-field circumferential SAR rapid three-dimensional imaging method

The invention provides a near-field circumferential SAR rapid three-dimensional imaging method, and relates to the field of microwave imaging. Firstly, the target is converted into the polar coordinate format to obtain the target echo, and then analysis is performed by using the wave spectrum theory and the two-dimensional imaging result of the target is obtained by using the mode of angle domainconvolution calculation and frequency domain integration operation. The target scattering characteristic functions of different altitude surfaces are accordingly obtained through different altitude values and the information of different altitude surfaces is superposed so as to obtain the three-dimensional imaging result. The idea of combining Green's function decomposition and tomography is utilized to improve the operation speed of near-field circumferential imaging and also improve the image resolution, the target echo is precisely focused by using the Green's function decomposition technology so that the limitation of the rotation angle by the focusing convolution integration method is effectively solved, and the three-dimensional imaging result is obtained by using the idea of tomography. The target echo data can be precisely imaged effectively through the simulation result.