基于双电磁矢量传感器的近场源多参数估计

Parameters estimation of near-field sources based on dual electromagnetic vector sensors

基于双电磁矢量传感器(EVSs),提出一种新的近场源频率、波达方向(DOA)、距离和极化参数联合估计方法。该方法首先计算近场源的频率以及其在两个电磁矢量传感器处的二维DOA和极化参数,然后利用几何方法或搜索方法,得到近场源的距离估计。该方法仅需要两个电磁矢量传感器,节约了阵列孔径,适合于阵列孔径有限的场合。估计过程中仅需一次互相关以及特征分解等简单的运算,且各参数自动配对,节省了运算量。实验结果验证了该方法的有效性。

A new algorithm for joint estimation of frequency, direction of arrival （DOA）, range and polarization of near-field source is proposed in this papers, which uses only two electromagnetic vector sensors （EVSs）. The new method proceeds in two steps, the first step is to estimate the frequency, DOA and polarization of the near-field source on the locations of the two EVSs respectively; the second step is to obtain the range by trigonometry or two-dimension searching. Using only two EVSs, the proposed method saves the array aperture and it is suitable in the occasion where the aperture is limited. Moreover, the computational complexity is reduced because only simple computations such as correlation and eigendecomposition are needed in the estimation process, and all parameters match automatically. Simulations are presented to show the effectiveness of the new algorithm.