文章摘要
一种水声宽带双曲调频信号波达方向估计方法
A DOA estimation method for underwater wideband HFM signals
投稿时间:2018-01-16  修订日期:2018-03-07
DOI:
中文关键词: 分数阶傅里叶变换,双曲调频信号,波达方向,均匀线列阵
英文关键词: Fractional Fourier Transform, Hyperbolic Frequency Modulation, Direction of arrival estimation, Uniform linear array
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
李军 大连理工大学电子信息与电气工程学部信息与通信工程学院 lijunwk@163.com 
林秋华 大连理工大学电子信息与电气工程学部信息与通信工程学院  
王凯 大连东软信息学院 计算机科学与技术系  
康春玉 海军大连舰艇学院 水武与防化系  
杨秀庭 海军大连舰艇学院 水武与防化系  
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中文摘要:
      提出了一种基于短时分数阶傅里叶变换的水下宽带双曲调频信号波达方向估计方法。建立了均匀线列阵声纳远场宽带双曲调频信号接收数据模型,在时域将接收信号进行分时段处理,对每一段短时信号分别进行分数阶傅里叶变换,将时域阵列接收数据转化成多段短时分数阶傅里叶域阵列数据,同时将多个时段的时变阵列流形矩阵变换成与每个时段一一对应的多个固定阵列流形矩阵。利用多重信号特征方法估计各短时信号的空间谱,应用求和运算进一步得到整体时段双曲调频信号空间谱,通过谱峰搜索实现对双曲调频信号的波达方向估计。通过仿真实验与分析,对该方法进行水声双曲调频信号波达方向估计的有效性进行了验证,分析了该方法在阵列接收信号时域分段数、信噪比、目标方位等参数变化条件下的性能,与传统方法相比,该方法具有更高的方位分辨率和估计精度。
英文摘要:
      A method of estimating the direction of arrival (DOA) for underwater wideband hyperbolic frequency modulation (HFM) signal is proposed. The received wideband HFM signal data model of uniform linear array sonar in the far field is established. The received signal is divided into multiple short-time signals and fractional Fourier transform is applied to transform the traditional array data into a short-time fractional Fourier domain array data. At the same time, the time-varying array manifold matrix is transformed into a fixed array manifold matrix. The spatial spectrum of each short-time signal is estimated by the multiple signal characteristion (MUSIC) method, and the HFM signal spatial spectrum of the whole time is further obtained by summation operation. Finally, DOA estimation of HFM signals is realized through spectral peak search. The effectiveness of the method is verified by simulation experiments and the influence of time domain segmentation number, SNR and sound source orientation on the performance of the method is mainly studied. Compared with the traditional method, this method has higher azimuth resolution and estimation accuracy.
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