中文说明：
MIMO-OFDM雷达波束形成及优化。首先，MIMO-OFDM雷达和OFDM-MIMO雷达的定义在不同的期刊是不同的。这里MIMO-OFDM雷达的定义同IET期刊，即发射阵列应用频率分集。MIMO-OFDM雷达同时使用了频率分集和波形分集，当发射阵列阵元间距是接收阵列阵元间距的N倍时，虚拟孔径最大，这时波束最窄，空域分辨力最高。
English Description：
MIMO-OFDM radar beamforming and optimization. Firstly, the definitions of MIMO-OFDM radar and OFDM-MIMO radar are different in different journals. Here, the definition of MIMO-OFDM radar is the same as that of IET journal, that is, transmitting array applies frequency diversity. MIMO-OFDM radar uses frequency diversity and waveform diversity at the same time. When the spacing of transmitting array elements is n times of that of receiving array elements, the virtual aperture is the largest, the beam is the narrowest and the spatial resolution is the highest.