结合有限新息率重构的水声宽带信号方位估计方法  

Direction of arrival estimation method for underwater acoustic broadband signals based on finite rate of innovation

作　　者：明超 牛海强 李整林 郭永刚[2] 甘维明[1,5] MING Chao;NIU Haiqiang;LI Zhenglin;GUO Yonggang;GAN Weiming(Hainan Acoustics Laboratory,Institute of Acoustics,Chinese Academy of Sciences,Haikou 570105,China;State Key Laboratory of Acoustics and Marine Information,Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190,China;School of Ocean Engineering and Technology,Sun Yat-sun University,Zhuhai 519000,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519000,China;Hainan Field Scientific Observation and Research Station of Lingshui Marine Information,Lingshui 572423,China)

机构地区：[1]中国科学院声学研究所南海研究站,海口570105 [2]中国科学院声学研究所声学与海洋信息全国重点实验室,北京100190 [3]中山大学海洋工程与技术学院,珠海519000 [4]南方海洋科学与工程广东省实验室(珠海),珠海519000 [5]陵水海洋信息海南省野外科学观测研究站,陵水572423

出　　处：《应用声学》2025年第2期423-433,共11页Journal of Applied Acoustics

基　　金：国家自然科学基金项目(12174418);院士工作站项目(202305AF150075);中国科学院基础与交叉前沿科研先导专项(XDB0700000);海南省自然科学基金(523QN309)。

摘　　要：基于压缩感知理论的稀疏重构方法容易受网格失配的影响,导致其性能下降。此外,这类方法的计算复杂度较高,难以满足实时应用的要求。相比之下,有限新息率(FRI)重构方法在解决网格失配问题和提升计算效率方面具有明显优势。实际的水声信号通常是宽带信号,而现有的FRI重构方法多基于窄带信号的假设,未深入研究宽带信号的方位估计问题。针对这一问题,该文提出一种基于多项式比值模型的宽带信号FRI方位估计方法,该方法首先通过一种基于矩阵极分解的宽带聚焦算法,将所有频率的接收信号聚焦到同一个参考频率上,随后使用FRI方法对聚焦后的信号进行方位估计。与传统基于相干信号子空间的方位估计方法相比,该方法无需预先估计目标方位,数值仿真和实验结果表明,该方法可以实现高效率且相对准确的方位估计。Sparse reconstruction methods based on compressed sensing theory are susceptible to grid mismatch,leading to performance degradation.Moreover,the high computational complexity of these methods makes them unsuitable for real-time applications.In contrast,sparse reconstruction methods based on finite rate of innovation(FRI)theory offer significant advantages in terms of grid mismatch and computational efficiency.However,existing research on FRI-based reconstruction methods has focused on narrowband signals,neglecting the processing and direction of arrival(DOA)estimation of broadband signals.To address this issue,this paper proposes an FRI-based DOA estimation method for broadband signals.The method first uses a broadband focusing algorithm based on matrix polar decomposition to align the received signals of all frequencies to a com mon reference frequency.Then,the FRI method is applied to the focused signals for DOA estimation.Unlike traditional broadband DOA estimation methods,this approach does not require pre-estimation of the target direction.Numerical simulations and experimental results demonstrate that the proposed method achieves high-resolution DOA estimation with high computational efficiency.

关 键 词：到达方向估计 宽带信号 有限新息率 

分 类 号：TB566[交通运输工程—水声工程]