Abstract:MIMO radar with transmit diversity has the potential of high-resolution imaging, but the imaging results suffer from huge sidelobes. In order to analyze the imaging performance of MIMO radar, this paper establishes an imaging model firstly. The high-resolution ability of diversity is demonstrated from spatial spectral coverage, and the sidelobe performance of diversity image is analyzed in particular. Based on spectral extrapolation, a fusion imaging method for MIMO radar with transmit diversity is proposed. This method can achieve high-resolution images with good sidelobe performance. Finally, simulations are performed in order to validate the effectiveness of the proposed method.