MIMO-OFDM radar imaging method based on cyclic prefix

The invention discloses an MIMO-OFDM radar imaging method based on cyclic prefix, and mainly aims to solve the problem of distance unit interference in the prior art. The MIMO-OFDM radar imaging method comprises the following steps: designing a Zadoff-Chu sequence based on cyclic shift as discrete time domain waveforms transmitted from different antennas of discrete time domain; inserting the cyclic prefix into the heads of the discrete time domain waveforms; performing digital/analog conversion on signals with the cyclic prefix, and adding radar carrier frequency so as to generate transmission signals of the transmitting antennas; dividing full wide swath into a plurality of sub-wide swaths through a plurality of spatial filters, thereby obtaining baseband discrete echo signals of the sub-wide swaths, and performing distance reconstruction free of distance unit interference for the signals, thereby achieving imaging. By adopting the MIMO-OFDM radar imaging method, the influence of distance unit interference can be avoided, distance images can be relatively effectively reconstructed on the premise that the high distance resolution and spatial diversity are ensured, and the MIMO-OFDM radar imaging method can be applied to the detecting and imaging process of a synthetic aperture radar.