基于多线谱干扰抑制的水下对空运动声源线谱探测

针对水下对空运动声源探测时面临的多线谱水下强干扰问题，提出一种稳健可靠的基于多线谱干扰抑制的线谱检测方法。采用该方法对接收声场进行线谱提取，限定每个信源所在方位的空间谱能量主要来自一条线谱的贡献，抑制多线谱干扰的能量，最后综合所有线谱贡献，得到最终的方位估计结果。两次水下对空探测实验验证了所提方法的有效性，结果表明，线谱检测方法可有效抑制同频干扰，在低信噪比、多干扰环境下成功实现了水下对空运动声源的线谱探测。

Multiple Line Spectrum Interference Suppression-based Line Spectrum Detection of Moving Airborne Sound Source Underwater

A robust and reliable detection method based on multiple line spectrum interference suppression is proposed to solve the problem of strong underwater interference in the detection of moving airborne sound source underwater.The line spectrum of the received sound field is extracted，and then the spatial spectrum energy of each source being mainly from the contribution of one line spectrum is limited to suppress the interference energy of multiple line spectrum. Finally，the direction estimation is obtained by synthesizing all the line spectrum contributions. The effectiveness of the proposed method is verified through two underwater-to-air detection experiments. The results show that the method can be used to detect the line spectrum of moving airborne sound source underwater in the low SNR and multiple interferences environment，and effectively suppress the interference with the same or very similar frequency.