稀疏电磁对阵列到达角和极化参数估计

摘要

There exist the phase ambiguities in sparse array direction finding,a joint parameter estimation algo-rithm with sparse cross-shaped loop and dipole pair array was proposed in this paper.According to the rotational invariance relationship between the dipoles and the loops,the estimates of polarization parameters were ob-tained.The phase ambiguities could be disambiguated by using the virtual baseline method,the high-precision estimations of direction of arrival are herein acquired.The eigenvalues and eigenvectors of the same eigenvalue decomposition could be automatically matching,no additional pairing operations were required.Simulation ex-amples verified that this method could not only overcome the problem of phase ambiguity caused by sparse cross array,but also greatly improve the estimation accuracy of arrival angle.%针对稀疏阵列测向中相位解模糊问题,提出了一种稀疏电磁对十字形阵列的到达角和极化参数联合估计算法,根据电偶极子和磁偶极子之间的旋转不变关系进行极化参数估计,利用虚拟基线解模糊得到信号到达角的高精度估计.该方法利用同一次特征分解的特征值和特征矢量自动配对,不需要额外的配对运算.仿真实验表明,本方法不仅克服了非均匀十字阵由于稀疏造成的相位模糊问题,而且大大提高了到达角的估计精度.