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实验数据揭示了一些舰船辐射噪声通过在频带上连续排列的窄带滤波器组后，各频道中的幅度调制很相似，这是舰船噪声的一个很有应用前景的目标特性。文章还研究了用高阶谱高阶统计的信号处理工具来提取和保留幅度周期调制的相位信息，并给出了计算机模拟结果，实际船噪声结果和具体提取方法。利用这些相位信息和双谱的幅度信息可以重建周期调制信号，并称这个重建波形为这条船的标记图。最后调查了三条船的标记图与本船及不同船的实际幅度调制之间的互相关系数，本船的互相关系数要比不同船的互相关系数大许多。
The experimental data reveal that some of the ship’s radiated noises pass through the narrow-band filter bank arranged in the frequency band successively, and the amplitude modulation in each channel is very similar, which is a promising target characteristic of ship noise. The paper also studies the phase information of amplitude-period modulation using high-order spectral high-order signal processing tools and gives the computer simulation results, the actual ship noise results and the specific extraction methods. Using these phase information and bispectrum amplitude information, the periodic modulation signal can be reconstructed, and this reconstruction waveform is referred to as the marker of the ship. Finally, the cross-correlation coefficients between the marked maps of three ships and the actual amplitude modulation of own ships and different ships were investigated. The correlation coefficient of own ship is much larger than the cross-correlation coefficient of different ships.