基于水下运动目标辐射噪声线谱数学模型，通过分析水下目标辐射噪声特征等信息实现。基于经典谱与现代谱估计的联合估计法提取水下目标辐射噪声线谱特征，首先估计采集数据的功率谱，得到估算功率谱图；分析功率谱图，确定线谱存在的大致区域，再利用线性调频z变换进行频谱细化，精确估计线谱位置。%Based on the line-spectrum mathematical model of radiation noise pattern of underwater moving target, we can analyse the characteristic of underwater target radiated noise information such as the implementation. Joint estimation method which is based on the classical and modern spectrum estimation can collect the line-spectrum characteristics of underwater target radiation noise. First the power spectrum to estimate the sampling data, and then estimation of power spectrum diagram is obtained. Analysis of power spectrum diagram, we can determine the line-spectrum which is roughly the area, then we can use the chirp z transform frequency spectrum refinement, whicn can accurately estimate the position of line-spectrum.
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