计算机科学 ›› 2019, Vol. 46 ›› Issue (11A): 376-380.

• 网络与通信 • 上一篇    下一篇

一种准确鲁棒的宽带信号DOA估计算法

徐正勤1,2, 伍世虔1,2, 刘清宇2   

  1. (武汉科技大学高性能钢铁材料及其应用湖北省协同创新中心 武汉430081)1;
    (武汉科技大学机械与自动化学院 武汉430081)2
  • 出版日期:2019-11-10 发布日期:2019-11-20
  • 通讯作者: 伍世虔(1964-),男,博士,教授,主要研究方向为机器视觉、机器学习、智能机器人及公共安全与视频技术,E-mail:shiqian.wu@wust.edu.cn。
  • 作者简介:徐正勤(1992-),男,硕士,主要研究方向为智能机器人。
  • 基金资助:
    本文受国家自然科学基金项目(51805381)资助。

Accurate and Robust Algorithm for Broadband Signal DOA Estimation

XU Zheng-qin1,2, WU Shi-qian1,2, LIU Qing-yu2   

  1. (Hubei Collaborative Innovation Center for Advanced Steels,Wuhan University of Science and Technology,Wuhan 430081,China)1;
    (School of Machinery and Automation,Wuhan University of Science and Technology,Wuhan 430081,China)2
  • Online:2019-11-10 Published:2019-11-20

摘要: 信源的到达角(Direction of Arrive,DOA)信息在许多实际应用领域中具有重要作用,因此对DOA的准确估计是阵列信号处理领域的研究热点。针对传统信号子空间非相干处理方法(Incoherent Signals-subspace Method,ISM)在含有混响的低信噪比环境下对宽带信号进行DOA估计时存在的准确性低的问题,文中提出一种基于ISM算法的改进算法。该算法首先利用离散傅里叶变换将宽带信号分解为若干子频带;其次提出一种构建能量门限的方式,通过该能量门限筛选子频带并保留能量高于该门限的子频带;然后提出一种协方差矩阵重构方法,重构每一个子频带的协方差矩阵,通过TLS-ESPRIT算法估计每一个子频带的DOA参数;最后提出一种加权策略对多个子频带的DOA估计值进行处理,得到最终的DOA估计值。实验结果表明,该算法可以有效地提高宽带信号DOA的准确性,并且具有较好的鲁棒性。

关键词: DOA估计, ISM, 宽带信号, 能量加权, 能量门限, 重构协方差矩阵

Abstract: The Direction of Arrive (DOA) information of the source plays an important role in many practical applications.Therefore,it is a research hotspot to estimate the DOA accurately in the field of array signal processing.In view of the low accuracy of the traditional ISM(Incoherent Signals-subspace Method) for DOA estimation of broadband signals in a low SNR and reverberation condition,this paper presented an improved DOA estimation algorithm based on the ISM.Firstly,the wideband signal is decomposed into several sub-bands by discrete Fourier transform.Secondly,a way to construct an energy threshold is proposed by which the sub-band is filtered by the energy threshold and the sub-band with energy above the threshold is reserved.Thirdly,a covariance matrix reconstruction method is used to reconstruct the covariance matrix of each sub-band,and the DOA parameters of each sub-band are estimated by the TLS-ESPRIT algorithm.Finally,a weighting strategy is proposed to process the DOA estimates of multiple sub-bands and the final DOA is estimate accurately.The experimental results show that the proposed algorithm can effectively improve the accuracy of broadband signal DOA and has better robustness.

Key words: Broadband signal, Direction of arrival estimate, Energy threshold, Energy weighted, Incoherent signals-subspace method, Reconstruct the covariance matrix

中图分类号: 

  • TN911.72
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