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中文核心期刊

频率−波数域处理的线谱目标增强检测

Line spectrum target enhancement detection in the frequency-wavenumber domain

  • 摘要: 针对复杂水下环境中的弱线谱目标检测问题, 提出了一种基于频率−波数域处理的增强检测方法。该方法利用线谱目标的时空相干特性, 构建适配于均匀线列阵处理的频率−波数域二维联合滤波器, 通过自适应迭代方式实现对线谱目标的二维增强; 在此基础上, 将频率−波数域的主瓣检测累积结果作为方位谱的输出, 实现对线谱目标的方位高分辨。仿真结果表明, 该方法对带宽内信噪比−35 dB线谱目标的处理增益可达21.3 dB, 方位分辨率在0.3°内。利用海上实测数据进行验证, 该方法对线谱目标的处理增益可达8 dB。与CBF、SSED等宽带处理方法相比, 该方法具有更高的线谱目标处理增益; 与ALE、STJD等线谱处理方法相比, 该方法具有更低的旁瓣起伏和更高的目标方位分辨率。

     

    Abstract: For the weak line spectrum target detection in the complex underwater environment, this paper proposes an enhancement detection method in the frequency-wavenumber domain. This method utilizes the spatial and temporal coherence characteristics of line spectral targets to construct a two-dimensional joint filter adapted to passive processing in a uniform linear array, and achieves two-dimensional enhancement of line spectral targets through adaptive iterative methods. On this basis, the main lobe detection accumulate result in the frequency-wavenumber domain is used as the output of the direction spectrum to achieve high direction resolution for line spectral targets. Simulation results show that the processing gain of this method for line spectral targets with a signal-to-noise ratio of −35 dB within the bandwidth can reach 21.3 dB, with an direction resolution within 0.3°. Using real data to test this method, the processing gain for line spectral targets can reach 8 dB. Compared to broadband processing methods such as the CBF and SSED, this method exhibits a higher gain in processing line spectrum targets; compared to line spectrum processing methods such as the ALE and STJD, this method has lower sidelobe fluctuations and higher target azimuth resolution.

     

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