摘要
舰船辐射噪声中的线谱成分能表征舰船的本质特征,是舰船目标识别中的主要特征矢量。因此,舰船辐射噪声线谱的准确检测在目标识别中具有十分重要的意义。针对海洋环境噪声中舰船辐射噪声线谱检测问题,提出了两级自适应线谱增强器(adaptive line enhancement,ALE)检测方法。该方法在原一级ALE检测方法的基础上,将原信号延时信号与一级ALE误差信号相减后作为第2级ALE的输入再进行1次ALE。该方法较一级ALE在输入信号信噪比较低时能准确地将线谱从宽带背景噪声中分离出来。仿真和实验结果表明该方法的有效性和准确性。
Line main feature vector in spectra in ship radiated noise can represent the essential feature of ship, which was ship target recognition. So detecting ship radiated noise line spectra accurately was significance in target recognition. A method based on two-lever adaptive line enhancement was proposed for detection of ship radiated noise line spectra under sea environment noise in the paper. The method was established on one-level ALE. The difference between delay of input signal and error signal of the first ALE was acted as input of the second ALE. The method can separate the ship radiated noise line spectra from the broad band background noise under low SNR of input signal. While one-lever ALE cannot. The results from emulation and test validate that the proposed method was effective and accurate.
出处
《舰船科学技术》
北大核心
2012年第8期79-82,共4页
Ship Science and Technology
