基于旋转阵列的MIMO雷达误差校正方法

MIMO radar calibration method based on array rotation

针对集中式多输入多输出(MIMO)雷达发射端和接收端同时存在位置误差和幅相误差的问题,提出一种基于旋转阵列的误差校正方法.首先利用旋转阵列获得不同方位的回波数据,从而将耦合在一起的位置误差和幅相误差相分离,并通过解相位模糊得到虚拟阵列的位置信息,再根据虚拟阵列的形成原理,分别获得收发阵列的位置误差.然后,由回波数据协方差矩阵最大特征值所对应的归一化的特征向量求得发射端和接收端的幅相误差估计.最后通过仿真实验验证了方法的有效性和可行性.结果表明:在多种阵列误差并存的情况下,该方法复杂度低,能获得较精确的结果,且该方法还适用于非均匀MIMO雷达阵列.

For the sensor position errors and amplitude-phase errors in the transmitting and receiving arrays of collocated MIMO radar,a calibrating method based on arrays rotation was proposed.Firstly,the position errors and amplitude-phase errors were separated with each other by the data from different directions obtained by rotating arrays.Then,the positions of the virtual array was calculated after phase unwrapping.According to the formation principle of the virtual array,the actual positions of the transmitting and receiving arrays were obtained.Furthermore,the amplitude-phase errors were estimated via the normalized eigenvector of the maximum eigenvalue.Finally,the simulation results verify the effectiveness and feasibility of the method.In the presence of multiple errors,the method can get relatively accurate results with low complexity and it is also applicable to the non-uniform MIMO radar arrays.