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。(Beamforming and its optimization of MIMO-OFDM radar, the definition of MIMO-OFDM radar and OFDM-MIMO radar in different journal are fifferent. the MIMO-OFDM radar is equal to IET journal, that is transmitting end is frequency diverse array. Both frequency diversity and waveforms diversity are used in MIMO-OFDM radar, while interelement range in transmitting end is N times of receiving end, the virtual aperture is maximum, and spatial resolution is maximum.)