宽带MIMO雷达频率不变发射方向图快速综合方法

Fast frequency invariant transmit beampattern synthesis for wideband MIMO radar

多输入多输出(multiple-input multiple-output,MIMO)雷达的波形分集能力带来了灵活的发射波束方向图设计方法。针对均匀线阵提出了一种基于频率不变波束形成法快速综合宽带MIMO雷达发射方向图的方法,该方法利用频率不变波束形成法求解宽带MIMO雷达发射波形的频谱,采用交替矩阵匹配法设计恒模的发射波形。与基于两级迭代的宽带方向图综合方法(wideband beampattern formation via iterative techniques,WBFIT)相比,该方法无需矩阵求逆且迭代次数明显减少,大大降低了计算复杂度。计算机仿真结果表明,该方法具有与WBFIT法相近的宽带方向图综合性能,计算时间只有WBFIT方法的10%左右。

A waveform diversity of multiple-input multiple-output （MIMO） radar possesses flexible transmit beampattern synthesis. A fast wideband transmit beampattern synthesis algorithm based on frequency invariant beamformer （FIB） is proposed, the spectrum of wideband MIMO radar transmit waveforms is computed by the FIB, then an alternating matrix fitting method is used to design unimodular sequences. The proposed method does not require matrix inversion operation and has a much lower computation complexity compared with wideband beampattern formation via iterative techniques （WBFIT） due to the significant reduction of iteration order. The numerical results indicate that the proposed method performs similarly as WBFIT, but with only 10% of the computational costs.