电磁矢量传感器取向误差自校正方法

Calibration for electromagnetic vector sensor array misorientation

采用子空间方法研究了基于发射天线旋转的信号波达方向估计和取向误差自校正方法.利用一个到达方向未知的信号源,将校正过程中信号源发射天线绕z轴和x轴以90°进行两次坐标旋转,待校正电磁矢量传感器阵列分别接收和这3个到达方向有一定关系的发射信号,根据子空间理论并利用坡印廷矢量间的关系估计信号源到达方向和阵列的取向误差矩阵.该方法仅需要一次特征分解,不需要搜索运算和参数配对运算,计算量小,计算精度高.由实验结果可看出,校正后的参数估计值与真实值吻合得很好.

The subspace algorithm based on eigenvalue decomposion is sensitive to the array misorientation,so it is necessary to calibration the error.The calibration source＇s direction-of-arrival and misorientation are studied in this paper.By using a single calibrate source without an exact knowledge of its direction of arrival and rotating the transmitting antenna＇s 90° around the z axis and x axis,and the array with misorientation receives the three signals whose directions of arrival have a special relationship.According to the subspace theory and the relationship between the Poynting vectors,the calibration source＇s direction and the array misoriention are precisely estimated.Finally,simulation results verify the effectiveness of the algorithm.