基于虚拟孔径投影的共形阵MIMO雷达发射波形设计

为了克服共形阵天线单元指向互异带来波形旁瓣高的缺点,该文以圆弧阵为例,提出一种基于虚拟孔径投影的共形阵多输入多输出(multiple input multiple output,MIMO)雷达发射波形设计方法。该方法首先对各阵元指向进行精确建模,并通过共形阵虚拟投影方法,获得规则虚拟投影阵列;其次向量化发射信号矩阵,将发射波形设计问题转为发射信号协方差矩阵降秩问题;最后通过log-det heuristic 算法获得针对该虚拟阵列波形设计的凸优化数学模型,并利用凸优化工具箱对其求解。仿真结果表明,相较于现有方法,该方法能够对共形阵MIMO雷达设计更低旁瓣的发射波形。

Transmit beampattern design for conformal MIMO radar based on virtual aperture projection

In order to overcome the disadvantage of high sidelobes caused by different orientations of the antenna elements, a transmit waveform design method for the conformal multiple input multiple output (MIMO) radar based on virtual aperture projection is proposed,taking the circular array as an example. Firstly, on the basis of accurate modeling of each element, a regular virtual array is obtained by virtual projection of the conformal array; secondly, the waveform design problem is transformed into the rank minimization problem of the transmit waveform covariance matrix by vectorising the transmit signal matrix. Finally, by using the log det heuristic algorithm, a convex model for the waveform design of the virtual array is established, which can be solved effectively by the convex toolbox. The simulation results show that compared with the existing methods,this method can design a lower side lobe transmit waveform for conformal MIMO radar.