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中南大学学报(自然科学版)

Journal of Central South University

第47卷    第1期    总第257期    2016年1月

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文章编号:1672-7207(2016)01-0130-06
利用极化敏感阵列特性的信源数估计技术研究
吴娜,司伟建,焦淑红,吴迪

(哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨,150001)

摘 要: 针对极化敏感阵列多参数联合估计中的信源数估计问题,提出一种基于去特征处理的信源数估计方法。首先,对极化敏感阵列接收数据矢量的协方差矩阵进行特征分解,得到的特征值的个数为阵元数的2倍,将求得的特征值降序排列,其中后半部分小特征值对应的特征矢量张成的子空间包含于噪声子空间,利用这一特点构造投影矩阵;其次,通过去特征处理,重构新的协方差矩阵,求这些新协方差矩阵在投影矩阵上的投影;最后,根据投影结果构造判决函数,估计信源数。研究结果表明:入射角间隔和极化状态角间隔对算法估计性能有影响。通过与盖氏圆盘法的对比实验验证算法的有效性。

 

关键词: 极化敏感阵列;去特征处理;投影矩阵;信源数估计

A source number estimation method usingpolarization sensitive array characteristic
WU Na, SI Weijian, JIAO Shuhong, WU Di

College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, China

Abstract:Considering the source number estimation problem of multi-parameter joint estimation based on polarization sensitive array, a new source number estimation algorithm was presented based on feature eliminated process. Firstly, the method performed eigenvalue decomposition (EVD) on the covariance matrix of data vector which received by polarization sensitive array, the number of eigenvalues which was obtained was twice as much as the array element number, and then the eigenvalues were made in descending order, where the subspace spanned by the eigenvectors corresponded to the last half eigenvalues was included in the noise subspace, and this feature was used to construct a projection matrix. Secondly, new covariance matrixes were reconstructed by feature eliminated process, then calculate the projection of the new covariance matrixes on the projection matrix. Finally, the number of source was estimated according to the criterion function constructed by the projection results. The results show that the angle interval and polarization angle interval effect the performance of the proposed algorithm. The proposed algorithm is more effective than the common GDE method.

 

Key words: polarization sensitive array; feature eliminated process; projection matrix; source number estimation

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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