多输入多输出雷达发射天线低旁瓣设计

多输入多输出(MIMO)雷达发射波形的多样性,为发射方向图设计提供了更多的自由度。针对阵元等功率条件下获得低旁瓣高增益发射波束的问题,提出了一种采用极小极大准则优化设计发射波形相关矩阵的方法,并将该约束优化问题转换为无约束优化问题,便于采用经典迭代法求解。仿真结果表明:采用极小极大准则设计的发射方向图旁瓣区域平坦,最高旁瓣电平接近理论最低值。最后采用循环(CA)算法,获得易于数字阵列系统实现的相位编码信号,使用该相位编码信号得到的实际发射方向图与理论结果匹配良好。

Low sidelobe transmit antenna design for MIMO radar

Waveform diversity of MIMO radar provides more degrees of freedom for transmit beam-pattern design.Firstly,a min-max criterion is proposed for optimizing the correlation matrix of the transmit waveforms to solve the problem of lowsidelobe and high-gain transmit beam-pattern design under the uniform elemental power constraint.The constrained optimization problem is then converted into an unconstrained optimization problem,which can be solved by classical iterative algorithm. Simulation results show that the min-max sidelobe optimization method can obtain a transmit beam-pattern with flat sidelobe region and lower sidelobe level. Finally,phase-coded signals are optimized using the cyclic algorithm.The beampattern of designed phase-coded signals matches well with the theoretical results.