Three-Dimensional Target Imaging Based on Vortex Stripmap SAR

A novel 3D imaging method is proposed based on the vortex electromagnetic waves and the stripmap synthetic aperture radar. First, the imaging model is deduced and the echo characteristics are analyzed. Then, the imaging processing algorithm is proposed to reconstruct the target’s profiles, where the 3D echoes are decomposed into two 2D echoes. The azimuthal profile can be obtained by performing fast Fourier transform in the orbital angular momentum domain, and the target information in the y dimension is calculated by the azimuthal distribution, which is as a function of the slow time. The range-Doppler algorithms used in the fast time and slow time domains to achieve the range profile and cross-range profile. Finally, the target’s 3D image in the Cartesian coordinate is obtained according to the spatial geometric relationship. This paper can benefit the applications of OAM-carrying waves in radar realms as well as the development of the 3D imaging technique.

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