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应用科学学报 ›› 2009, Vol. 27 ›› Issue (4): 348-352.

• 信号与信息处理 • 上一篇    下一篇

解到达角估计模糊的二次虚拟阵列变换

李安 王殊   

  1. 1. 华中科技大学电子与信息工程系，武汉430074
    2. 南昌大学电子系，南昌330031
  • 收稿日期:2008-12-15 修回日期:2009-06-16 出版日期:2009-07-30 发布日期:2009-07-30
  • 作者简介:李安，博士生，研究领域：非均匀采样、阵列信号处理、信号检测与识别，E-mail: lian@ncu.edu.cn；王殊，教授，研究领域：智能信号检测、传输、处理及应用、无线传感器网络，认知无线电
  • 基金资助:
    国防“十一五”预研项目基金资助

Twice Virtual Array Transformation for Overcoming Direction-of-Arrival Estimation Ambiguity

  1. 1. Department of Electronics and Information Engineering, Huazhong University of Science and Technology,
    Wuhan 430074, China
    2. Department of Electronics, Nanchang University, Nanchang 330031, China
  • Received:2008-12-15 Revised:2009-06-16 Online:2009-07-30 Published:2009-07-30

PDF

2009

被引次数

52

摘要：

引入非均匀时延构造虚拟阵列变换的变换矩阵，提出一种基于二次虚拟阵列变换的到达角估计方法. 该方法利用非均匀时延间隔的随机性，每一次快拍下都等效于随机改变虚拟阵元的阵元间隔，突破了空域采样定理的限制，解决了在使用较大阵元间距条件下到达角估计的模糊问题. 同时增大的阵元间距也提高了估计的精度和分辨力. 进一步的实验表明，该方法是可行的、有效的，且能改善小信噪比条件下的估计精度.

关键词: 虚拟阵列变换, 到达角估计, 非均匀时延, 解模糊

Abstract:

A new approach is proposed for resolving the direction ambiguity by using twice virtual array transformation, which makes use of the nonuniform time delay to generate virtual transformation matrix. Due to the random variation in time interval of nonuniform time delay, the transformation based on nonuniform time delay matrix is equivalent to altering the relative distance between sensors. This means that the plane wave impinges a virtual uniform linear array with a time-varying array element interval. Therefore, a larger array aperture is available without anglular ambiguity, which enhances resolution and accuracy of the direction-of-arrival (DOA) estimation. Simulation results show that the proposed algorithm is effective for DOA estimation, and capable of improving estimation performance
at low SNR.

Key words: virtual array transformation, direction-of-arrival estimation, nonuniform time delay, resolving ambiguity

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