二维混合MIMO相控阵雷达的DOA估计算法

DOA estimation method for two-dimensional hybrid MIMO phased-array radar

针对二维混合多输入多输出相控阵雷达波达方向估计问题,结合发射权值优化和接收虚拟阵列的酉ESPRIT算法给出了有效解决方案.首先对二维混合多输入多输出相控阵雷达信号模型进行建模仿真,利用凸优化函数对发射权值矩阵进行优化设计,构造了接收数据矩阵的旋转平移不变关系,同时抑制了发射方向图旁瓣电平以提高波达方向估计精度.在此基础上,为了减小波达方向估计运算量,采用酉ESPRIT算法对二维混合多输入多输出相控阵雷达俯仰角和方位角进行了联合估计.仿真实验结果表明,所提方法有效解决了二维混合多输入多输出相控阵雷达的波达方向估计问题.

Aiming at the direction of arrival（DOA） estimation problem of the Two-Dimensional Hybrid MIMO（Multiple-Input Multiple-Output） Phased-array Radar, an effective solution is proposed based on transmit weight optimization and Unitary ESPRIT of the virtual array. First, we build the receiving signal model. Then a transmit weight vector is designed by convex optimization to simultaneously construct the receiving subarray rotational invariance and control the side lobe of the pattern of Two-Dimensional Hybrid MIMO Phased-array Radar to improve the DOA estimation accuracy. Finally, the Unitary ESPRIT is exploited to estimate the azimuth and elevation of Two-Dimensional Hybrid MIMO Phased-array Radar to decrease the calculation load. Numerical simulations show that our approach can realize DOA estimation of the Two-Dimensional Hybrid MIMO Phased-array Radar.