航空学报 > 2010, Vol. 31 Issue (8): 1646-1652

线性极化敏感阵列的极化平滑算法及相干源参数估计

刘兆霆1,2, 刘中1, 何劲1   

  1. 1. 南京理工大学 电子工程系 2. 绍兴文理学院 电子工程系
  • 收稿日期:2009-07-19 修回日期:2009-10-09 出版日期:2010-08-25 发布日期:2010-08-25
  • 通讯作者: 刘中

Polarization Smoothing-based Direction Finding and Polarization Estimation of Coherent Sources with Linear Electromagnetic Vector Sensor Array

Liu Zhaoting1,2, Liu Zhong1, He Jin1   

  1. 1. Department of Electronic Engineering, Nanjing University of Science and Technology2. Department of Electronic Engineering, Shaoxing University
  • Received:2009-07-19 Revised:2009-10-09 Online:2010-08-25 Published:2010-08-25
  • Contact: Liu Zhong

摘要: 研究了基于极化敏感阵列的相干信号参数估计问题。首先,提出一种利用均匀线性极化敏感阵列的新型极化平滑算法(ULAPSA),其能够处理更多相干信号的参数估计,且具有更小的计算量。然后,基于ULAPSA给出了波达方向(DOA)和极化参数估计的两种方法:第1种方法利用角度搜索得到信号的DOA估计,适应任何多分量的电磁矢量传感器阵列;第2种方法结合传播算子算法,无需奇异值分解和角度搜索,能够同时估计信号的DOA和极化参数。该方法适应完备的电磁矢量传感器、三偶极子或三磁环构成的矢量传感器。最后,通过仿真实验比较和分析了所提算法的性能。

关键词: 相干信号, 极化敏感阵列, 波达方向, 传播算子算法, 极化平滑算法

Abstract: This article studies the problem of direction finding and polarization estimation of coherent sources by means of uniform linear electromagnetic vector sensor array. A new polarization smoothing algorithm using a uniform linear array (ULAPSA), which can decorrelate the coherency of more sources compared with the PSA, is first proposed to preprocess the incident signals. Then two parameter estimation methods are presented with a developed ULAPSA. The first method estimtes the direction of arrival (DOA) by minimizing the cost function. The second method, which requires neither the eigendecomposition into signal/noise subspaces nor 2D iterative searching, applies the propagator method to estimate the direction cosines. The method is suitable for dipole triad, loop triad or dipole-triad-plus-loop-triad and can estimate both DOA and polarization. Finally, the performances of the proposed methods are evaluated through numerical examples, and their validity is proven.

Key words: coherent source, polarization sensitive array, direction of arrival, propagator method, polarization smoothing algorithm

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