一种基于瞬时相位方差加权的线谱检测器

针对水下目标未知线谱的检测问题，依据水下目标辐射噪声含有高强度稳定线谱这一特征，该文提出一种基于瞬时相位方差加权的线谱检测方法。该方法利用目标线谱频率单元对应瞬时相位比较稳定，背景噪声频率单元对应瞬时相位比较随机的特点，对各频率单元进行瞬时相位方差加权，可以进一步抑制背景噪声能量干扰，增强目标线谱检测信噪比(SNR)增益，实现对水下目标辐射噪声中未知线谱的检测。理论分析和实验结果表明:该方法可以较好地增强目标线谱能量、抑制噪声、提高信噪比，在抗复杂信道检测、识别领域具有良好的应用前景。

Weighted Line Spectrum Detector Based on Instantaneous Phase Variance

According to the feature that the underwater target radiated noise contains high intensive and stable line spectrum, a weighted line spectrum detection method based on the instantaneous phases variance is proposed with regard to the problem of unknown line spectrum detection. This method utilizes the characteristic that the instantaneous phase of target line spectral frequency unit being stable, and the instantaneous phase of noise frequency unit being random, to weight each frequency unit by the instantaneous phase variance, and can further restrain the background noise energy disturbances and enhance the Signal to Noise Ratio (SNR) gain of the target line spectrum detection, and achieves detecting unknown line spectrum of underwater target radiated noise. The theoretical analysis and experimental results both show that this method can well enhance the target line spectral energy and restrain the background noise energy, and has the capacity of improving SNR. It has better application prospects to the detection and identification areas of anti-complex channel.